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Case Study Questions for Class 7 Science Chapter 13 Motion and Time

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Here we are providing case study or passage-based questions for class 7 science chapter 13 Motion and Time .

Case Study/Passage Based Questions

The smallest time interval that can be measured with commonly available clocks and watches is one second. However now special clocks are available that can measure time intervals smaller than a second. Some of these can measure time intervals as small as one millionth or even one billionth of a second. 1. A micro-second is a very small time interval. It is equal to (a) one thousandth of a second (b) one hundredth of a second (c) one millionth of a second (d) one billionth of a second 2. The time measuring devices used in sports can measure time intervals of (a) a milli second (b) a micro second (c) a nano second (d) None of these 3. Which of the following will be needed to measure the time period of a pendulum? (a) a stop watch (b) a table clock (c) a wrist watch (d) Any one of these

What is case study question for class 7 science.

Case study or passage-based questions in class 7 Science typically require students to read a given scenario or passage and answer questions based on the information provided. These questions assess students’ comprehension, analytical thinking, and application of scientific concepts.

Best Ways to Prepare for Case Study Questions

To develop a strong command on class 6 Science case study questions, you can follow these steps:

Read the textbook and study materials: Familiarize yourself with the concepts and topics covered in your class 6 Science curriculum. Read the textbook thoroughly and take notes on important information.
Practice analyzing case studies: Look for case studies or passages related to class 6 Science topics. Analyze the given information, identify key details, and understand the context of the situation.
Develop comprehension skills: Focus on improving your reading comprehension skills. Practice reading passages or articles and try to summarize the main points or extract relevant information. Pay attention to details, vocabulary, and the overall structure of the passage.
Understand scientific concepts: Ensure that you have a solid understanding of the scientific concepts discussed in class. Review the fundamental principles and theories related to each topic.
Make connections: Try to connect the information provided in the case study to the concepts you have learned in class. Identify any cause-effect relationships, patterns, or relevant scientific principles that apply to the situation.
Practice critical thinking: Develop your critical thinking skills by analyzing and evaluating the information given in the case study. Think logically, consider multiple perspectives, and draw conclusions based on the evidence provided.
Solve practice questions: Look for practice questions or sample case study questions specifically designed for class 6 Science. Solve these questions to apply your knowledge, practice your analytical skills, and familiarize yourself with the format of case study questions.
Seek clarification: If you come across any challenging concepts or have doubts, don’t hesitate to ask your teacher for clarification. Understanding the underlying principles will help you tackle case study questions effectively.

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Important Questions Class 7 Science Chapter 13

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case study questions for class 7 science motion and time

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Important Questions Class 7 Science Chapter 13 – Motion and Time

Science is a basic foundational subject consisting of three branches: physics, biology, and chemistry. In today’s world, we are surrounded by a lot of Science-oriented developments. Hence, students need to strengthen the basic concepts of science and the application of those concepts in the practical world.

Chapter 13 of Science Class 7 deals with the concept of motion and time, an introductory chapter for the complex and advanced topics in the upper classes. The core topics covered in this chapter are:

Concept of motion and its types
Speed and its applications
Measurement of time
Measurement of speed
Distance-time graphs for different kinds of motion

Extramarks is a trusted online educational platform providing educational resources like notes and question banks. Extramarks are followed by many students and teachers across the country. The main reason being that the materials provided by Extramarks strictly adhere to the CBSE guidelines, prepared by subject professionals to deliver quality material for students desiring to achieve full marks in exams.

As students move up to higher classes, Science becomes more challenging. It is critical for students to give importance to complex subjects and focus on understanding concepts and practising numerals. In the chapter motion and time, students must grasp the meaning of terms and their application in daily life for an easier retention of the concept. Students are advised to solve Important Questions Class 7 Science Chapter 13 to get easier access to all the important concepts at a single glance.

Important Questions Class 7 Science Chapter 13 – With Solutions

Practising Important Questions Class 7 Science Chapter 13 will aid students in ensuring the preparation of all the important topics for exams. While self accessing, if they realise the need to practise a topic or question, they can learn it while solving Important Questions Class 7 Science Chapter 13.

The following Chapter 13 Class 7 Science Important Questions are provided for students to help them better understand Chapter 13- motion and time.

Question 1: Classify the following motions as straight line, circular, or oscillatory:

(a) Hand motion while sprinting.

(b) The motion of a horse while pulling a cart along a straight road.

(d) A child swinging on a see-saw.

(e) The motion of an electric bell’s hammer.

(f) The motion of a train on a straight bridge.

(a) Oscillatory motion- while moving, hands move back and forth across our bodies after a given interval of time. As a result, it oscillates.

(b) Straight line- as horse is moving cart on a straight road, hence motion is along a straight line

(c)Circular motion- Motion of a child in a merry-go-round is circular, as the merry-go-round also has a circular motion.

(d) Oscillatory motion- Motion of a child on a see-saw is oscillatory as the see-saw goes up and down while the child rides it.

(e) Oscillatory motion- the hammer hits the electric bell ,and vibrates to and fro rapidly, hence its oscillatory motion.

(f)Straight line- Motion of a train on a straight bridge is a straight line as the path is straight.

Question 2: It takes 32 seconds for a simple pendulum to complete 20 oscillations. What is the pendulum’s time period?

Number of oscillation completed= 20

Time taken to complete 20 oscillations= 32 sec

Time period of the pendulum :

T=total time taken number of oscillations

Question 3: The distance-time graph for the motion of two vehicles, A and B, is shown in Figure.

Which of them is moving the fastest?

Distance-time graph of two cars in motion.

Answer 3: Vehicle A is moving faster than vehicle B.

As speed is directly proportional to distance covered and inversely proportional to time taken hence,

At a given time ‘t’ the distance covered by vehicle A is more than the distance covered by vehicle B. Hence, vehicle A is faster.

Question 4: The distance between two stations is 240 kilometres.

This distance is covered in four hours by train.

Calculate the train’s speed.

Distance between two stations= 240 km

Time taken to cover the distance= 4 hours

speed= distancetime=2404=60km/h

Question 5: When the clock reads 08:30 AM, the odometer of a car reads 57321.0 km.

What is the distance travelled by the car if the odometer reads 57336.0 km at 08:50 AM?

Calculate the car’s speed in kilometres per hour during this time.

Express the speed in kilometres per hour as well.

The car’s odometer reads 57321.0 km at the start.

The car’s final odometer reading = 57336.0 km

Distance driven = Final reading of the car’s odometer + Initial reading of the car’s odometer

The car travelled 57336.0 57321.0 = 15 kilometres.

The specified car departs at 8:30 a.m.

and terminates at 8:50 a.m.

As a result, the time it takes the car to travel the distance is (8:50 8:30) min = 20 min.

The car travelled 15 kilometres.

Time taken by the car = 20 min

speed=distance coveredtime taken=1520=0.75 km/min

60 min = 1 hour

20 min=16020= 13h

Time taken by car in hours = 1/3h

speed=distance coveredtime taken=151/3=45 km/h

Question 6: The basic unit of speed is:

Answer 6: (d) m/s

speed=distance coveredtime taken

Unit of distance is measured in metres (m).

Unit of time is measured in seconds (sec).

So, the basic unit of speed is m/s. Question 7:A car travels at 40 km/h for 15 minutes, then at 60 km/h for the next 15 minutes.

The car has travelled the following distance:

Answer 7: (b) 25 km

The car’s maximum speed is 40 kilometres per hour.

Time spent = 15 minutes = 15/60 = 0.25 hours

speed=distance traveled/time spent

Distance travelled, d1 = Speed Time Required = 40 0.25 = 10 km

Case No. II

The car’s maximum speed is 60 kilometres per hour.

Distance travelled, d2 = Speed Time Required = 60 0.25 = 15 km

d = d1 + d2 = 10 + 15 = 25 km total distance travelled by car

As a result, the total distance travelled by the car is 25 kilometres.

Question 8: Which of the following statements is incorrect?

(a) The fundamental unit of time is the second.

(b) Every object moves with a constant speed.

(d) A given pendulum time period is constant.

(e) The speed of a train is measured in metres per hour.

Answer 8: Incorrect statements are :

(d) The time period of a given pendulum is constant.

(e) The speed of a train is expressed in m/h.

Question 9: A bus travels 54 km in 90 minutes. The speed of the bus is

(d) 0.6 m/s

Answer 9: (b) 10m/s

Distance = 54km= 54 X 1000 = 54000m

Time = 90 minutes = 90 X 60 = 5400sec

speed=distance coveredtime taken=540005400= 10m/s

Question 10: Boojho walks to his school, which is 3 kilometres from his house, in 30 minutes.

When he arrives, he discovers that the school is closed and returns home on his bicycle with a friend in 20 minutes.

His average speed in kilometres per hour is:

Answer 10: (b) 7.2

speed=distance coveredtime taken= 65060=7.2km/h

Question 11: Given below as Figure 13.8 is the distance-time graph of the motion an object.

(a) What will be the position of the object in the 20s?

(b) What will be the distance travelled by the object in 12s?

Answer 11:

(a) At 20sec the object will be 8 m away from the starting point.

(b) In 12 sec, the distance travelled by the object will be 6 metres.

Question 12:The distance between Bholu house and Golu’s house is 9 kilometres.

At 7 p.m., Bholu must attend Golu’s birthday party.

He set out on his bicycle at 6 a.m. and covered a distance of 6 km in 40 minutes.

At that point, he met Chintu and spoke with him for 5 minutes before arriving at Golu’s birthday party at 7 p.m.

How quickly did he complete the second leg of the journey?

Calculate his average speed over the course of the journey.

Answer 12:

The speed with which Bholu covered the second part of the journey = Distance left to reach Golu’s house Time left

Speed=9km – 6km1hour- 45 min=3km1/4h=12km/h

Average speed= Total distance travelledTotal time taken= 9km1h=9km/h

Question 13: Differentiate between distance and displacement.

Answer 13:

Question 14: Define a) Non-uniform speed b) Instantaneous speed

Answer 14:

a) Non-uniform speed: An object is said to be travelling with non-uniform speed if it covers equal distance in unequal intervals of time or unequal distance in equal interval of time.

b)Instantaneous speed: The speed of a moving object at any particular instant of time is called instantaneous speed.

Question 15: What do you mean by the oscillation of a pendulum?

Answer 15: Pendulum oscillation is defined as a full to and fro motion of the pendulum from its rest position. . The time taken by it to complete one oscillation is called the pendulum’s time period. It depends on the string of the pendulum.

Question 16: Speedometer records the reading in

Answer 16: d) km/h

Speedometer records the reading in km/hr.

Question 17: Minimum speed required for rockets to launch satellites into earth’s orbit is:

Answer 17: b) 8 km/s

Minimum speed required for rockets to launch satellites into earth’s orbit to overcome the resisting force is 8 km/s.

Benefits of Solving Important Questions Class 7 Science Chapter 13

Extramarks believes in empowering children through quality education. Extramarks, an education technology company, provides educational resources like CBSE revision notes and Important questions for classes starting from class 1 to class 12. It is trusted by millions of students and teachers as the quality material delivered by Extramarks is curated by subject experts with proper knowledge and helps in guiding thousands of students in achieving good scores in exams.

By solving Important Questions Class 7 Science Chapter 13, student benefit in numerous ways:

Important Questions Class 7 Science Chapter 13 covers all the core topics in Chapter 13 and provides students with a comprehensive understanding of concepts.Students are immensely benefited by solving Important Questions Class 7 Science Chapter 13 as they get to revise the whole chapter while retaining the concepts and definitions.
Students who regularly solve ImportanQuestions Class 7 Science Chapter 13 get an extra edge during exams. As the question bank for Class 7 Science Chapter 13 Important Questions consists of important questions created by experts, there is a higher chance of getting the questions from Important Questions Class 7 Science Chapter 13 in exams.
By practising Important Questions Class 7 Science Chapter 13, students get familiar with the writing style of answers. This aids students in overcoming exam fear and scoring full marks in exams with perfect answer formatting. While solving questions, students can also refer to the solutions given after every problem if they have any doubt. There are negligible mistakes in the solutions provided by Extramarks, which help the students clear their doubts and enhance their understanding of a topic.
Important Questions Class 7 Science Chapter 13 contains questions of every format, ranging from multiple choice questions [MCQs], very short answer types questions, short answer type questions, and long answer type questions. This helps students practise aa wide variety of questions.

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Class 7 Solutions

Class 7 Science Chapter 13 Motion and Time | Extra Questions

by Manjusha · Published September 14, 2021 · Updated April 26, 2022

Here are extra questions from NCERT Class 7 Science Chapter 13 Motion and Time.

1. What is speed?

The distance covered by an object in a unit of time is the speed of that object. It is calculated by dividing the total distance covered by the total time taken.

2. What is non-uniform motion?

When the speed of an object moving along a straight line keeps changing, it is said to be non-uniform motion.

3. What is uniform motion?

When an object moves along a straight line with a constant speed, it is said to be in uniform motion.

4. In the case of uniform motion, the average speed is the ………………………… as the actual speed.

5. The motion of a simple pendulum is an example of a …………………………….

Periodic motion

6. What is the time period of a pendulum?

The time taken by the pendulum to complete one oscillation is called its time period.

7. What is the basic unit of time?

8. What is the basic unit of speed?

m/s (meter / second)

9. One microsecond is …………………………… of a second.

One-millionth

10. One nanosecond is …………………………. of a second

One-billionth

11. Distance is equal to speed x ………………………..

12. What is a speedometer?

A speedometer is a device that records the speed directly in km/h.

13. What is an odometer?

This is a device that measures the distance covered by a vehicle.

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Motion and Time Important Questions Class 7 Science Chapter 13

Motion and Plants Class 7 Science Chapter 13 Important Questions and Answers are provided here. We prepared these extra questions based on the latest NCERT Class 7 Science Book. These important questions will help you to properly understand a particular concept of the chapter. Practicing class 7 important questions before the exam will help you to get excellent marks in the exam.

Class 7 Science Chapter 13 Motion and Time Important Questions

Very short answer type question.

1: The basic unit of speed is (i) Km/ min (ii) m/ min (iii) Km/ sec (iv) m/ sec

Answer: (iv)m/ sec

2: A faster moving object covers more distance in _________ time.

Answer: less

3: (Speed = Distance/ Time). True/ False

Answer: True

4: What is the SI unit of distance?

Answer: Meter

5: Name an object that shows oscillatory motion.

Answer: Pendulum

6: What is the motion of our hands while running?

Answer: oscillatory motion

7: What is the motion of a child in a merry-go-round?

Answer:

straight line motion

8: The time period of a given pendulum is not constant. True/ False

Answer: False

9: What is motion?

Answer: Motion is a change in the position of an object with time.

10: What is circular motion?

Answer: Motion of an object in a circular path is called circular motion e.g. Motion of the hands of a clock.

11: If the speed of an object keeps changing in equal interval of time, while moving along a straight line, its motion is said to be ___________________.

Answer: Non-uniform

12: The to and fro motion of an object from the position of rest is called a _____________.

Answer: Oscillatory motion.

13: One complete to and fro motion of a pendulum from rest position is called one______________.

Answer: One oscillation

14: Give an example of vibratory motion.

Answer: The movement of strings in musical instruments like guitar or sitar.

15: Name the device on vehicles to track the distance covered.

Answer: An odometer

16: The basic unit of time is _________.

Answer: Second

17: Define average speed.

Answer: The average speed of a moving object is defined as the total distance covered by it divided by the total time taken.

18: What do you mean by the statement; “car is moving with the speed of 50 Km per hour”?

Answer: Car is moving with the speed of 50 Km per hour it means it will cover a distance of 50 Km in one hour

19: Define uniform motion.

Answer: Objects that move in a straight line and maintain the same speed throughout the distance covered are said to be in uniform motion.

20: Define non- uniform motion.

Answer: Objects that move in straight line and whose speed varies are said to be in non-uniform motion

21: The metallic ball in pendulum is called __________ of the pendulum.

Answer: Bob

22: Give an example of oscillatory motion.

Answer: To and fro motion of a simple pendulum

23: The symbol of all units is written in _________________.

Answer: Singular

24: _____________motion may be along a straight line or along a curved path.

Answer: Translatory

25: Motion along a curved path is called _______________.

Answer: curvilinear motion

26: Name the device used to measure speed.

Answer: Speedometer

27: What type of graph is used to represent motion of an object?

Answer: distance-time graph

28: For a body in non-uniform motion, the graph is not a straight line. True/ False.

29: The working of a pendulum clock is based on the _____________ of its pendulum.

Answer: time period

30: Motion of the hammer of an electric bell is _____________ motion.

Answer: Oscillatory motion

Short Answer Type Questions

1: What do you mean by non-uniform speed?

Answer: An object is said to be moving with variable speed or non-uniform speed if it covers equal distances in unequal intervals of time or vice-versa.

2: A child is on see-saw, what kind of motion he have and why? Explain.

Answer: On a see-saw child goes up and comes down from mean position and repeats itself. So there is oscillatory motion.

3: Explain how in ancient time a day, a month and a year were measured.

Answer: In ancient time the time between one sunrise and the next was called a day. A month was measured from one new moon to the next and a year was fixed as the time taken by the earth to complete one revolution of the sun.

4: Define velocity along with its unit.

Answer: Velocity can be defined as the rate of change of displacement.SI unit of velocity is m/s (meter/second Velocity is a vector quantity.

5: What are quartz clocks?

Answer: It is a special type of clock or watch which have an electric circuit with one or more cells are called quartz clocks.

6: How do we know an object is moving faster compared to the speed of another object?

Answer: By finding the distance travel by a moving body in unit time 1 hr. or 1 sec we know the speed of an object that help us to know which one is moving faster i.e. having greater speed.

7: If a car is moving with a speed of 5Km/h on highway then find the distance travelled by the car in 4 hours?

Answer: We know distance travelled by a body = speed × time So, distance travelled by the car = 5 × 4 = 20 km

8: Sumit covers a distance of 2.4 Km from his house to reach her college on a scooter. If the scooter has a speed of 6m/sec, calculate the time taken by her to reach the college.

Answer: Total distance travelled = 2.4 km = 2.4 × 1000 m = 2400m.

Speed = 6m/sec

Now, time = (Distance/speed) = 2400/6 = 400 sec.

9: How can you say that motion and rest are relative?

Answer: We have observed that the position of stars and planets change while you remain stationary. In reality the earth is moving too. Thus, an object which appears to be at rest, may actually be in motion. Therefore, motion and rest are relative terms.

10: Differentiate between circular motion and periodic motion.

Answer: Motion of an object in a circular path is called circular motion eg. Motion of the hands of a clock. But when an object repeats its motion after some time. This type of motion is called periodic motion. E.g. Motion of a pendulum, motion of a child on a swing, motion of the strings of a guitar.

11: Give an example when objects undergo combinations of different types of motion?

Answer: The motion of a ball on the ground. Here the ball is rolling on the ground and rotating as well as moving forward on the ground. Thus, the ball undergoes a rectilinear motion as well as rotational motion.

12: What is simple pendulum?

Answer: A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread .The metallic ball is called the bob of the pendulum.

13: What is oscillation of a pendulum?

Answer: One complete to and fro motion of a pendulum from rest position is called one oscillation. The time taken by the pendulum to complete one oscillation is called its time period. It is only depending on the length of the string of pendulum.

14: What are the points that should be kept in mind while choosing scale for drawing graph?

Answer: The following points should be kept in mind while choosing most suitable scale for drawing a graph

The difference between the highest and the lowest values of each quantity.
The intermediate values of each quantity to mark the values on the graph.
To utilize the maximum part of the paper on which graph is to be drawn.

15: What is the advantage of a distance- time graph?

Answer: Distance-time graphs gives information about the nature of the motion of an object like uniform or non-uniform motion. Motion of an object can be represented by its distance-time graphs.

16: Differentiate between distance and displacement.

Answer: The distance covered by a moving object is the actual length of the path followed by the object is called. Distance is a scalar quantity. SI unit of distance is meter. But Displacement is the shortest distance covered by a moving object from the point of reference (initial position of the body), in a specified direction.

17: What do you mean by time?

Answer: The interval between two events is called time. Example: The time between one sunrise and the next was called a day. Clocks or watches are the most common time measuring devices. The basic unit of time is a second. Its symbol is s. Larger units of time are minutes (min) and hours (h).

18: A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

Answer: Time taken to complete 20 oscillations = 32 s

Time period of the pendulum = No of oscillations/Total Time taken = 32/20 s = 1.6s

19: Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

Answer: Distance between her school and house = speed of bicycle × Time taken = 2m/s × 60s = 1800m

20: The distance between two stations is 300 km. A train takes 6 hours to cover this distance. Calculate the speed of the train.

Answer: The distance between two stations = 300 km Time taken by the train to cover that distance = 6 hours Speed of the train = 300/6 Km/h =50 km/h

Long Answer Type Questions

1: Differentiate between uniform speed and average speed.

Answer: An object is said to be moving with uniform speed if it covers equal distances in equal intervals of time. But when we travel in a vehicle the speed of the vehicle changes from time to time depending upon the conditions existing on the road. In such a situation, the speed is calculated by taking the ratio of the total distance travelled by the vehicle to the total time taken for the journey. This is called the average speed.

2: What do you mean by instantaneous speed?

Answer: When we say that the car travels at an average speed of 60 km/h it does not mean that the car would be moving with the speed of 60 km/h throughout the journey. The actual speed of the car may be less than or greater than the average speed at a particular instant of time. The speed of a moving body at any particular instant of time is called instantaneous speed.

3: State different types of motion?

Answer: Following are different types of motion:

Translatory Motion: – In Translatory motion the particle moves from one point in space to another. This motion may be along a straight line or along a curved path.
Rectilinear motion : Motion along a straight line is called rectilinear motion. Example: A car moving on a straight road
Curvilinear motion: Motion along a curved path is called curvilinear motion. Example: A car negotiating a curve
Rotatory Motion : In rotatory motion, the particles of the body describe concentric circles about the axis of motion
Vibratory Motion: In vibratory motion the particles move to and fro about a fixed point.

4: The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

Answer: Initial reading of car odometer = 57321.0 km Final reading of car odometer = 57336.0 km Time at the time of Initial reading = 08:30 AM Time at the time of Initial reading = 08:50 AM

Distance travelled by the car = 57336.0 km – 57321.0 km = 15 Km

Time taken by the car to cover distance = 08:50 AM – 08:30 AM = 20 min

Speed of the car in Km/m = 15 km/20min = 0.75 Km/min

Speed of the car in Km/h = 15 km/20m × 60 = 45 Km/h

Thought Chakra

NCERT Solutions for Class 7 SCIENCE – Chapter 13 – Motion And Time

Table of Contents

NCERT SOLUTIONS- MOTION AND TIME

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time is the essential study material to perfect Motion and Time topics. The NCERT Class 7 Science solutions provided here correctly answer NCERT textbook questions. Solutions curated comprehensively will help students understand the subtopics in this chapter in a better way.

IMPORTANT SUB-TOPICS MENTIONED IN THE NCERT CLASS 7 SCIENCE CHAPTER 13 MOTION AND TIME:

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time has the following sub-topics as given below:

NCERT SOLUTIONS CLASS 7 SCIENCE CHAPTER 13 MOTION AND TIME:

1. Classify the following as motion along a straight line, circular or oscillatory motion:

(i) Motion of your hands while running.

(ii) Motion of a horse pulling a cart on a straight road.

(iii) Motion of a child in a merry-go-round.

(iv) Motion of a child on a see-saw.

(v) Motion of the hammer of an electric bell.

(vi) Motion of a train on a straight bridge.

ANS- i) Oscillatory

ii) Motion along a straight line

iii) Circular motion

iv) Oscillatory motion

v) Oscillatory motion

vi) Motion along a straight line.

2. Which of the following are not correct?

(i) The basic unit of time is second.

(ii) Every object moves with a constant speed.

(iii) Distances between two cities are measured in kilometres.

(iv) The time period of a given pendulum is constant.

(v) The speed of a train is expressed in m/h.

ANS- Incorrect statements are:

3. A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

ANS- Given,

Number of oscillations= 20

Total time taken to complete 20 oscillations= 32s

Time Periods= Total time takenNumber of oscillations= 3220= 1.6 s

4. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.

Distance between two stations= 240 km

Total time taken= 4hrs = 240 mins [460]

Speed= DistanceTime= 2404 = 60 km/h

5. The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

ANS- Initial reading of the odometer = 57321.0

The final reading of the odometer = 57336.0

Distance covered by the car = Final reading of the odometer – Initial reading of the odometer

= 57336.0 – 57321.0 = 15 km

Starting time of the car is 8:30 and it stops at 8:50

Hence, time is taken by car = 20 mins

Speed= DistanceTime= 1520= 0.75 km/min

20 min= 16020=13h

Speed= DistanceTime= 151/3= 45km/h

6. Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

ANS- Time taken by Salma to reach her school by bicycle = 15 mins= 15 x 60 = 90 s

Speed of Salma’s bicycle= 2m/s

Speed= DistanceTime

Distance covered= SpeedTime= 2900= 1800 m

1800 m = 110001800= 1.8 km

7. Show the shape of the distance-time graph for the motion in the following cases:

(i) A car moving with a constant speed.

(ii) A car parked on a side road.

8. Which of the following relations is correct?

(i) Speed = Distance × Time

(ii) Speed = Distance/Time

(iii) Speed = Time/Distance

(iv) Speed = 1/Distance x Time

ANS- (ii) Speed = Distance/Time

9. The basic unit of speed is:

ANS- (iv) m/s

10. A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

(i) 100 km (ii) 25 km (iii) 15 km (iv) 10 km

ANS- (ii) 25 km

Calculations:-

When the speed of the car was 40km/h

The time taken by the car was 15 minutes = 0.25h {15/60}

Distance covered = SpeedTime = 400.25 = 10 km

When the speed of the car was 60 km/h

Distance covered = SpeedTime = 600.25 = 15 km

Total Distance Covered by the car = D 1 + D 2 = 10+15 = 25 km

11. Suppose the two photographs, shown in Fig. 13.1 and Fig. 13.2, had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the fastest car.

ANS- The distance covered by the blue car (as evident from the photograph) from one horizontal white strip to another, which is measured by scale is 1.2 cm.

It is given that 1 cm is equivalent to 100 m.

Therefore, 1.2 cm is equivalent to 120 m.

Distance travelled by the car = 120 m

Time taken to cover this distance = Time interval between the two photographs = 10 s

12. Fig. 13.15 shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?

ANS- Vehicle A is moving faster than vehicle B.

13. Which of the following distance-time graphs shows a truck moving with speed which is not constant?

ANS- Answer is (iii)

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NCERT Solutions for Class 7 Science Chapter 13 - Motion and Time FREE PDF Download

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Topics Covered in NCERT Solutions Class 7 Science Chapter 13: Motion and Time

The following topics are discussed in Chapter 13 of Class 7 Science.

Introduction to motion

Introduction to the concept of distance and displacement

Introduction to speed

Measurement of time

Units of time and speed

Calculating time and speed

Distance-time graph

Access NCERT Solutions for Class 7 Science Chapter 13 – Motion and Time

1. Classify the following as motion along a straight line, circular or oscillatory motion.

i) Motion of your hands while running

Ans: Oscillatory motion

During running the hands move to and fro and as this motion gets repeated after a certain time interval. Therefore it is an oscillatory motion.

ii) Motion of a horse pulling a cart on a straight road

Ans: Straight line motion

As the horse cart is moving on a straight road. Therefore motion is along the straight line.

iii) Motion of a child in a merry-go-round

Ans: Circular motion

Motion of the merry-go-round is circular. Therefore kids sitting inside it experience the circular motion.

iv) Motion of a child on a see-saw

As the see-saw goes up and down continuously. Therefore it is an oscillatory motion.

v) Motion of the hammer of an electric bell

When the hammer vibrates the bell it starts vibrating. It is an example of oscillatory motion.

vi) Motion of a train on a Straight Bridge

The train is moving on the straight bridge. It exhibits motion of a straight line.

2. Which of the following are not correct?

i) The basic unit of time is second

Ans: Correct

SI unit of time is second.

ii) Every object moves with a constant speed

Ans: Not correct

Speed of the object is constant or variable.

iii) Distances between two cities are measured in kilometers

The distance between two cities is very large. And as a kilometer is a bigger unit therefore it is used to measure the distance between two cities.

iv) The time period of a given pendulum is not constant

The time period depends upon the length of the thread. Therefore it will be constant for a particular pendulum.

v) The speed of a train is expressed in m/h

The speed of the train is measured either in km/h or m/s.

3. A simple pendulum takes 32 s to complete 20 oscillations. What is the time-period of the pendulum?

Ans: The time taken to complete one oscillation is known as the time period of the pendulum.

\[Time\text{ }Period\text{ }=\text{ }\dfrac{\left( Total\text{ }time\text{ }taken \right)}{\left( Number\text{ }of\text{ }Oscillations \right)}\text{ }\]

Given: \[20\] oscillations taking \[32s\] to complete.

\[\therefore 1\text{ }oscillation\text{ }will\text{ }take\text{ }=\dfrac{\left( 32 \right)}{\left( 20 \right)\text{ }}\text{ }sec\text{ }=\text{ }1.6\text{ }second\]

\[\therefore \text{ }1.6s\]is the time period of the pendulum.\[\]

4. The distance between two stations is\[\mathbf{240}\text{ }\mathbf{km}\]. A train takes\[~\mathbf{4}~\]hours to cover this distance. Calculate the speed of the train.

Ans: \[Speed\text{ }=\text{ }\dfrac{\left( Distance\text{ }travelled \right)}{\left( Time \right)}\text{ }\]

\[\Rightarrow Speed=\dfrac{\left( 240\text{ }km \right)}{\left( 4h \right)}\text{ }\]

\[\therefore Speed=60\text{ k}m/h\]

5. The odometer of a car reads \[\mathbf{57},\mathbf{321}.\mathbf{0}\text{ }\mathbf{km}\]when the clock shows the time \[\mathbf{8}.\mathbf{30}\text{ }\mathbf{AM}\] . The odometer reading was changed to\[\mathbf{57},\mathbf{336}.\mathbf{0}\text{ }\mathbf{km}\]. Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

Ans: Initial reading of the odometer of the car at \[8:30\text{ }AM\text{ }=57321.0\text{ }km\]

Final reading of the odometer of the car \[8:50\text{ }AM\text{ }=\text{ }57336.0\text{ }km\]

The car starts at \[8:30\text{ }AM\]and stops at \[8:50\text{ }AM.\]

\[Distance\text{ }covered\text{ }by\text{ }car\text{ }=\text{ }\left( 57336\text{ - }57321 \right)\text{ }km\text{ }=\text{ }15\text{ }km\]

Time taken between \[08:30\text{ }AM\]to \[08:50\text{ }AM\text{ }=\text{ }20minutes\] \[=\dfrac{20}{60}\text{ }hour\] = \[\dfrac{1}{3}\text{ }hour\]

So Speed in km/min

\[~~~Speed\text{ }=\text{ }\dfrac{\left( Distance\text{ }travelled \right)}{\left( Time \right)}\]

\[\Rightarrow Speed=\dfrac{\left( 15km \right)}{\left( 20min \right)}\]

\[\therefore Speed=0.75km/min\]

Speed in km/h

\[Speed\text{ }=\dfrac{\left( Distance\text{ }travelled \right)}{\left( Time \right)}\]

\[\Rightarrow Speed=\dfrac{\left( 15km \right)}{\dfrac{1}{3}h}\]

\[\Rightarrow Speed=\dfrac{\left( 15\times 3 \right)\text{ }km}{\left( 1h \right)}\]

\[\therefore Speed=45km/h\]

6. Salma takes \[\mathbf{15}\]minutes from her house to reach her school on bicycle. If the bicycle has a speed of\[\mathbf{2}\text{ }\mathbf{m}/\mathbf{s}\], calculate the distance between her house and the school.

Ans : \[Speed\text{ }=\text{ }2m/s\]

\[Time\text{ }taken\text{ }to\text{ }reach\text{ }school\text{ }=\text{ }15\text{ }min\]

\[\Rightarrow 15\times 60s=900\text{ }s\]

\[Distance=\left( Speed\text{ }x\text{ }Time \right)\]

\[\Rightarrow Dis\tan ce=2\times 900=1800m\]

Also \[1km=\text{ }1000m\]

\[\therefore Dis\tan ce=1800\times \dfrac{1}{1000}=1.8km.\]

The distance between her house and the school is \[1.8\text{ }km.\]

7. Show the shape of the distance-time graph for the motion in the following cases:

i) A car moving with a constant speed.

Ans: A car moving with a constant speed covers equal distance in equal intervals of time. It will be a uniform motion.

Distance-time graph will be as below:

ii) A car parked on a side road.

Ans : A car parked on a road there is no change in the distance with the time. No motion.

Therefore the graph obtained will be parallel to x-axis.

Distance- time graph will be as below:-

8. Which of the following relations is correct?

\[Speed\text{ }=\text{ }\left( Distance\times Time \right)\]

\[Speed\text{ }=\text{ }\left( \dfrac{Distance}{Time} \right)\]

\[Speed\text{ }=\text{ }\left( \dfrac{Time}{Distance} \right)\]

\[Speed\text{ }=\text{ }\left( \dfrac{1}{\left( Distance\times Time \right)} \right)\]

Ans: Speed of an object is given by the relation:-

9. The basic unit of speed is:

\[k\mathbf{m}/\mathbf{min}\]

\[\mathbf{m}/\mathbf{min}\]

\[~\mathbf{km}/\mathbf{h}\]

\[\mathbf{m}/\mathbf{s}\]

Ans: \[\mathbf{m}/\mathbf{s}\].

The unit of distance is meter (m) and of time is second(s).

Therefore the basic unit of speed is m/s.

10. A car moves with a speed of \[\mathbf{40}\text{ }\mathbf{km}/\mathbf{h}\] for $15$ minutes and then with a speed of \[\mathbf{60}\text{ }\mathbf{km}/\mathbf{h}\] for the next 15 minutes. The total distance covered by the car is:

\[\mathbf{100}\text{ }\mathbf{km}\]

\[\mathbf{25}\text{ }\mathbf{km}\]

\[~\mathbf{15}\text{ }\mathbf{km}\]

\[\mathbf{10}\text{ }\mathbf{km}\]

Ans: 25 km

\[Speed\text{ }=\text{ }40\text{ }km/h\]

\[Time=15\text{ }min=\left( \dfrac{15}{60} \right)\text{ }hour\]

\[Distance\text{ }\left( {{d}_{1}} \right)=Speed\times Time=40\times \left( \dfrac{15}{60} \right)=10\text{ }km\]

\[Speed=60\text{ }km/h\]

\[Distance\text{ }\left( {{d}_{2}} \right)=\left( Speed\times Time \right)=60\times \left( \dfrac{15}{60} \right)=15\text{ }km\]

\[Total\text{ }distance\text{ }\left( d \right)=\left( {{d}_{1}}~+\text{ }{{d}_{2}} \right)=10\text{ }km+15\text{ }km=25\text{ }km\]

Therefore total distance covered by the car \[=\text{ }25km.\]

11. Suppose the two photographs, shown in Fig. 13.1 and Fig.13.2, had been taken at an interval of 10 seconds. If a distance of 100 meters is shown by 1 cm in these photographs, calculate the speed of the blue car.

Ans: With the help of the scale we will first measure the distance.

Suppose the distance measured is \[2cm\] .

So, the distance covered \[d\text{ }=2\times 100=2m\]. (Because \[1m=100cm\]).\[~Time\text{ }taken\text{ }=\text{ }10seconds.\]

\[Speed=\left( \dfrac{Distance}{Time} \right)=\left( \dfrac{200m}{10s} \right)=20m/s.\]

Therefore the speed of the blue car \[=\text{ }20m/s.\]

12. Fig. 13.5 shows the distance-time graph for the motion of two vehicles A and B. Which is one of them moving faster?

Ans: In distance – time graph speed is measured by its slope.

Vehicle A is moving faster as the slope of the graph of A is more than the slope of the graph B.

Therefore Vehicle A is moving faster

13. Which of the following distance time-graphs a truck moving with speed which is not constant?.

Ans: (iii) as the graph is not a straight line, it keeps on changing.

This shows that the truck is moving with variable speed.

NCERT Solutions for Class 7 Science – Free PDF Download

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Chapter 13 – Motion and Time

Introduction.

You have already studied about different types of motion in class VI. A motion as you know can be along a straight line, circular or periodic. In this chapter, you shall learn in detail about types of motion in detail.

13.1 Slow or Fast

You must have seen vehicles moving on the street. Just by observing those vehicles, you can easily identify which one is moving faster than the other. Read activity 13.1 carefully and observe the diagram to understand the concept of slow and fast movement of vehicles in a better way.

The distance covered by an object in a unit time is known as the speed of the object. You might have heard your father saying that the car is moving at a speed of 60 kilometers per hour. This statement simply means that the car is covering 60 kilometers in one hour. The formula of speed as used in this chapter is given below.

Speed = (Total distance covered)/(Total time taken).

In this section, you shall learn in detail the concept of speed and speed of different objects, in the context of the time taken by the objects to complete any particular task.

13.3 Measurement of Time

Have you ever wondered, if the clock wasn’t a part of our lives, how would we have known the time of the day? Well, our ancestors back then obviously did not have clocks with them. You know, many events in nature repeat themselves after specific intervals of time. In this section, you will also learn about a pendulum.

The to and fro motion of a simple pendulum is known as oscillatory motion or periodic motion. The small metallic ball of a pendulum is called the bob. The time taken by a pendulum to complete one oscillation is known as its time period. Observe figure 13.4 (a) and (b) to understand the working of the pendulum in a better manner.

(Image will be uploaded soon)

Units of Time and Speed

As all quantities are measured in metric units, there are units for the measurement of time and speed, as well.

The S.I. unit of time = Second (s).

The S.I. Unit of Speed = Meters per second (m/s).

In this section, you shall learn about the different units of speed.

13.4 Measuring Speed

Now, you have learned about the calculation of distance and time. With the time taken by an object to cover a particular distance, you can easily calculate the speed of an object. In this section, you shall learn to calculate the speed of a ball. Similarly, you can use the formula as explained in this to calculate the speed of other objects as well. You must have noticed a meter-like device fitted in your vehicles. It has km/h written in the corner. It is the device that records speed in km/h and is known as a speedometer. The other meter that measures the distance moved by the vehicle is known as an odometer.

13.5 Distance - Time Graph

You have already studied about different graphs in mathematics. This section deals with the concept of a distance-time graph. The distance and time can be represented through a bar graph, a pie chart, as well as a line graph. In this section, you shall learn in detail about different distance-time graphs and their formation. Distance-time graphs are generally used to present the motion of any object in a pictorial form. The distance-time graph for the motion of an object that is moving with a constant speed is a straight-line graph. In this section, you will not only learn to read such graphs, but you will also learn the step method of plotting a graph.

Exercise Solutions: 13 Question (2 short questions and 11 long questions).

Extended Learning – Activities and Project (4 Questions).

Key Points Covered in Ncert Solutions Chapter 13 Class 7 Science at a Glance

The following are some of the important points that are discussed in the chapter.

When an object changes its position with respect to time, it is said to be in motion.

The speed of the object is the distance an object travels in unit time.

The speeds of objects allow us to determine which one is travelling faster.

Metre per second (m/s) is a unit of speed.

The measurement of time is based on periodic events.

The motion of objects can be depicted graphically using distance-time graphs.

For the movement of an item travelling at a steady speed, the distance-time graph is drawn as a straight line.

NCERT Solutions Class 7 Science Chapters

Chapter 1 - Nutrition in Plants

Chapter 2 - Nutrition in Animals

Chapter 3 - Fibre to Fabric

Chapter 4 - Heat

Chapter 5 - Acids

Chapter 6 - Physical and Chemical Changes

Chapter 7 - Weather

Chapter 8 - Winds

Chapter 9 - Soil

Chapter 10 - Respiration in Organisms

Chapter 11 - Transportation in Animals and Plants

Chapter 12 - Reproduction in Plants

Chapter 14 - Electric Current and Its Effects

Chapter 15 - Light

Chapter 16 - Water: A Precious Resource

Chapter 17 - Forests: Our Lifeline

Chapter 18 - Wastewater Story

Key Features of NCERT Solutions for Class 7 Science

It is always essential to have a proper understanding of all NCERT questions to secure good marks in the exam. With the help of the science solutions prepared by Vedantu experts, students can learn and practice the correct answers to the questions from all topics. It will also help you to develop a better understanding of all the concepts. Some notable key features of Vedantu solution PDF are:

It provides easy assistance and important study material to all the students struggling to find accurate answers to their NCERT questions.

This PDF is available for free to all the students regardless of any criteria.

There is no time restriction for downloading the solution PDF. Students can download it at any time as per their convenience from the official website of Vedantu.

This will help you to revise your NCERT concepts, thereby facilitating a better understanding of the appropriate answering pattern. So, it will help you to score well in exams.

Conclusion

NCERT Solutions for Class 7 Science Chapter 13 - Motion and Time, provided by Vedantu, help students understand the concepts of motion and time in a simple way. The solutions cover important topics like types of motion, measurement of time, and related scientific principles. One crucial section focuses on explaining the various types of motion, such as circular and straight-line motion, making it easier for students to grasp these concepts. Overall, these solutions serve as a valuable resource for Class 7 students, enhancing their understanding of science and laying a foundation for more advanced learning in the future.

FAQs on NCERT Solutions for Class 7 Science Chapter 13 - Motion And Time

1. What is motion and time, according to Chapter 13 of Class 7 Science?

When there is a change in the position of an object with respect to time, it is known as motion. In Class 7 Motion and Time, you will learn about different motions, including why some motions are fast, and others are slow, speed and how it is measured, how time is measured, and the different units of speed and time. You will also learn how to draw and understand a distance-time graph. You will solve some practical life problems too.

2. What is the unit of Time, according to Chapter 13 of Class 7 Science?

Generally, the basic unit of time, that is second, is used. The bigger units of time are minute and hour. The symbol of the second is s. Though it is the most commonly used unit of time, other units are also used depending on the need. For example, no one tells their age in terms of seconds, minutes or hours, they use year instead of that.

3. What is Speed, according to Chapter 13 of Class 7 Science?

Speed can be referred to as the distance covered by any moving object in unit time. Its basic unit is meter per second (m/s), but the speed of fast-moving vehicles is often expressed in kilometres per hour (km/hr) also. Fast-moving objects have high speed, i.e. they cover more distance in unit time than those of low speed which covers less distance in unit time.

4. What is the unit of speed, according to Chapter 13 of Class 7 Science?

The unit of speed is distance /time, which is meter per second (m/s). Time is, of course, expressed in minutes and hours, and distance can also be expressed in other units like km, cm, mm, etc. Therefore, speed has many other units, like cm/min., km/hr, etc. These units are used only when required.

5. How to get high marks in Chapter 13 of Class 7 Science?

To get high marks in Chapter 13 of Class 7 Science, you need to strategically study the NCERT Science book from the beginning of your session. You should also practice the NCERT solution books to get a better idea of the subject. You can download the NCERT Solution for each chapter in PDF format from Vedantu and read them offline. Practice answer writing too. These solutions are available for free on the Vedantu website and the Vedantu app and are curated by experts.

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NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF Download

By referring to the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time, students can learn to approach questions in different ways. These different approaches can be implemented while attempting Chapter 13 Motion and Time questions from the final exams; accordingly, students can score well. By solving more questions from Chapter 13 Motion and Time, students can easily improve the speed of attempting questions which can be helpful during exams or tests.

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF

Solving questions from the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF can assist students to grasp the important concepts. Students can solve Chapter 13 Motion and Time questions from their comfort zone through the Selfstudys website as it is available in the portable document format. After solving questions of Chapter 13 Motion and Time, students can also refer to a website to solve doubts as the answers are already available on the website.

Where can Students Find the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time?

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Visit the Selfstudys website.

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time, NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF, NCERT Class 7 Science Solutions Chapter 13 Motion and Time, NCERT Solutions for Class 7 Science Chapter 13 Motion and Time Revision, NCERT Solutions for Class 7 Science Chapter 13 Motion and Time Theory

Bring the arrow towards the NCERT Books & Solutions which can be seen in the navigation bar.

A drop down will appear, select NCERT Solutions from the list.

A new page will appear, now Class 7 from the list of classes.
Select Science from the list of subjects.
Now select Chapter 13 Motion and Time from the list of chapters.

Features of NCERT Solutions for Class 7 Science Chapter 13 Motion and Time

The features of NCERT Solutions for Class 7 Science Chapter 13 Motion and Time are considered to important part which students need to know; some of the features are discussed below:

Objective Questions are Included: In this type of questions of Chapter 13 Motion and Time students need to select the accurate answers according to their knowledge. These questions are included in the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time revision.
All Exercises are Covered: In the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time theory, all the exercises are covered so that students can find different ways to attempt different questions.
Diagrams are Included: Diagrams are considered to be graphical representation of the Chapter 13 Motion and Time concepts; these diagrams are included in the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF.
Available in the PDF: Students can start solving Chapter 13 Motion and Time questions from NCERT Class 7 Science Solutions as it is already available in the portable document format.
All Topics are Covered: Before solving questions of Chapter 13 Motion and Time from the NCERT Class 7 Science Solutions, students need to complete all the topics as it is covered through the questions.
Free Accessibility: The Chapter 13 Motion and Time questions of Class 7 Science NCERT Solutions have free accessibility, that is students don’t need to pay any kind of amount.

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Use Diagrams and Illustrations: While solving questions from the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time theory, students need to give diagrams and illustrations wherever there is a need. By giving diagrams and illustrations, students can score well in Chapter 13 Motion and Time questions.
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Motion and Time Class 7 Extra Questions and Answers Science Chapter 13

Motion and Time Class 7 Extra Questions and Answers Science Chapter 13 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 13 Extra Questions and Answers Motion and Time

Extra Questions for Class 7 Science Chapter 13 Motion and Time with Answers

Motion and Time Class 7 Extra Questions Very Short Answer Type

Question 1. Write formula for speed. Answer: Speed = $\frac{\text {Total distance travelled}}{\text {total time taken}}$

Question 2. Define a day. Answer: The time between one sunrise and the next is called a day.

Question 3. What is a year? Answer: A year is fixed as the time taken by the earth to complete one revolution around the sun.

Question 4. What is a month? Answer: A month is measured from one new moon to the next.

Question 5. What is bob? Answer: The metallic ball hanging with the thread is called the bob of the pendulum.

Question 6. What is oscillatory motion? Answer: The to and fro motion of an object is called periodic or an oscillatory motion of that object.

Question 7. What is speedometer? Answer: It is a device that is used to measure speed directly in km/h.

Question 8. What is odometer? Answer: Meter that measures the distance moved by the vehicle is known as an odometer.

Motion and Time Class 7 Extra Questions Short Answer Type 1

Question 1. “Speed of a car is 50 km/h.” What does it mean? Answer: When we say that a car is moving with a speed of 50 kilometres per hour, it implies that it will cover a distance of 50 kilometers in one hour.

Question 2. What are microseconds and nano-second? Answer: One microsecond is one-millionth of a second. A nanosecond is one-billionth of a second.

Question 3. Name different types of graphs. Answer: Bar graph, line graph, pie graph.

Motion and Time Class 7 Extra Questions Short Answer Type 2

Question 1. How is speed of car in non-uniform motion measured? Answer: The speed is calculated as the total distance covered divided by the total time taken. Thus, speed = $\frac{\text {Total distance covered}}{\text {Total time taken}}$ This is called average speed.

Motion and Time Class 7 Extra Questions Long Answer Type

Question 1. Suggest some points to be kept in mind while choosing the most suitable scale for drawing a graph. Answer: Some of the points to be kept in mind while choosing the most suitable scale for drawing a graph are:

the difference between the highest and the lowest values of each quantity.
the intermediate values of each quantity, so that with the scale chosen it is convenient to mark the values on the graph, and
to utilize the maximum part of the paper on which the graph is to be drawn.

Question 2. A ball moves 30 m in 6s. Find its speed. Answer: Here, d = 30 m t = 6 s s = ? We know, s = $\frac {d}{t}$ = $\frac {30m}{6s}$ = 5 ms -1 Question 3. A body is moving with a speed 10 m/s. After 1 minute, what is the distance traveled? Answer: Here, s = 10 m/s t = 1min = 60 s d = ? we know, s = $\frac {d}{t}$ ⇒ d = s.t = 10 m/s × 60 s = 600 m

Question 4. Find the distance covered by a car moving at 50 km/h in 2 hours. Answer: Given, s = 50 km/h t = 2 h d = ? We know that, s = $\frac {d}{t}$ or, d = st = 50 km/h × 2 h = 100 km

Motion and Time Class 7 Extra Questions and Answers Science Chapter 13

Question 6. Write briefly about the development of pendulum clock. Answer: It is said that once Galileo (AD 1564 – 1642) was sitting in a church. He noticed that a lamp suspended from the ceiling with a chain was moving slowly from one side to the other. He was surprised to find that his pulse beat the same number of times during the interval in which the lamp completed one oscillation.

Galileo experimented with various pendulums to verify his observation. He found that a pendulum of a given length takes always the same time to complete one oscillation. This observation led to the development of pendulum clocks. Winding clocks and wristwatches were refinements of the pendulum clocks.

Hope the knowledge provided regarding the Motion and Time Class 7 Extra Questions and Answers has helped you to the possible extent. For more info feel free to reach us and we will guide you at the earliest possibility. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly.

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time

From the perspective of CBSE, NCERT Solutions for Class 7 Science Chapter 13 Motion and Time is crucial study material. Get solutions of all chapters of NCERT class 7 Science from Physics Wallah.

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NCERT Solutions for Class 7 Science Chapter 13

NCERT Solutions for Class 7 Science Chapter 13: This page consists of details solution of chapter Motion and Time class 7 science. You can check NCERT Solutions for class 7 Science for other chapters of class 7 science prepared by Physics Wallah. do the questions by yourself and check your solution with Physics Wallah NCERT solution for the chapter Motion and Time. to have more depth in chapter Motion and Time class 7 science you must read the theory of Motion and Time and do the additional question of Physics Wallah click this link to do the questions and read theory of Motion and Time. along with NCERT solution of class 7 science.

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NCERT Solutions for Class 7 Science Chapter 13 Motion and Time Overview

NCERT Solutions Class 7 Science Chapter 13 covers these important topics. Students are advised to thoroughly review each topic in order to completely understand the ideas covered in the chapter and make good use of the offered solutions.

These solutions are a result of the teachers at Physics Wallah working hard to improve students’ understanding of the concepts covered in the chapter. After going over and rehearsing these answers, the goal is for students to easily score high exam results.

NCERT Solutions for Class 7 Science Chapter 13 Eexercise 1

Question 1: Classify the following as motion along a straight line, circular or oscillatory motion:

(i) Motion of your hands while running.

(ii) Motion of a horse pulling a cart on a straight road.

(iii) Motion of a child in a merry-go-round.

(iv) Motion of a child on a see-saw.

(v) Motion of the hammer of an electric bell.

(vi) Motion of a train on a straight bridge.

Answer: (i) Oscillatory motion

While running, the hands move to and fro and repeat their motion after a given interval of time. Hence, it is an oscillatory motion.

(ii) Straight line

The horse is pulling a cart on a straight road. Therefore, it has a motion along a straight line.

(iii) Circular motion

Merry-go-round has a circular motion. Therefore, a child sitting inside it will also have a circular motion.

(iv) Oscillatory motion

The child on a see-saw goes up and down continuously. It oscillates up-down. Therefore, it is an oscillatory motion.

(v) Oscillatory motion

The hammer hits the electric bell and vibrates rapidly. Therefore, it is an oscillatory motion.

(vi) Straight line

The train is moving on a straight bridge. Therefore, it has a motion along a straight line.

Question 2: Which of the following are not correct?

(i) The basic unit of time is second.

(ii) Every object moves with a constant speed.

(iii) Distances between two cities are measured in kilometres.

(iv) The time period of a given pendulum is not constant.

(v) The speed of a train is expressed in m/h.

(i) Correct

Second is the SI unit of time.

(ii) Not correct

An object can move with constant or variable speed.

(iii) Correct

The distance between two cities can be very large. Since kilometre is a bigger unit of distance, the distance between two cities is measured in kilometres.

(iv) Not correct

Time period of a pendulum depends on the length of the thread. Hence, it is constant for a particular pendulum.

(v) Not correct

The speed of a train is measured either in km/h or in m/s.

Question 3: A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

Answer: Number of oscillations = 20

Total time taken to complete 20 oscillations = 32 s

Question 4: The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.

Answer: Distance between the two stations = 240 km

Time taken = 4 h

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Question 5: The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

Answer: Initial reading of the odometer of the car = 57321.0 km

Final reading of the odometer of the car = 57336.0 km

Distance covered by the car

= Final reading of the odometer of the car − Initial reading of the odometer of the car

= 57336.0 − 57321.0 = 15 km

The given car starts at 8:30 a.m. and stops at 8:50 a.m.

Therefore, time taken by the car to cover the distance is (8:50 − 8:30) min = 20 min

Distance covered by the car = 15 km

Time taken by the car = 20 min

60 min = 1 h

Time taken by the car = 1/3 h

Question 6: Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

Time taken by Salma to reach her school from her home = 15 min = 15 × 60 = 900 s

Speed of her bicycle = 2 m/s

Distance covered = Speed × Time taken = 2 × 900 = 1800 m

1000 m = 1 km

1800m = 1/1000 x 1800 = 1.8 km

Question 7: Show the shape of the distance-time graph for the motion in the following cases:

(i) A car moving with a constant speed.

(ii) A car parked on a side road.

Answer: (i) A car moving with a constant speed covers equal distance in equal intervals of time. Such motion of car is represented in the given distance-time graph.

(ii) The distance-time graph of a car parked on a road side is such that with the increase in time, there is no change in distance, as shown in the given figure.

Question 8: Which of the following relations is correct?

(i) Speed = Distance × Time

(ii) Speed of an object is given by the relation

Question 9: The basic unit of speed is:

Answer : (iv) m/s

The basic unit of distance is metre (m).

The basic unit of time is second (s).

Therefore, the basic unit of speed is m/s.

Question 10: A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

(iii) 15 km

Answer: (ii) 25 km

Speed of the car = 40 km/h

Time taken = 15 min = 15/60 = 0.25 h

Distance covered, d1 = Speed × Time taken = 40 × 0.25 = 10 km

Speed of the car = 60 km/h

Distance covered, d2 = Speed × Time taken = 60 × 0.25 = 15 km

Total distance covered by the car, d = d1 + d2 = 10 + 15 = 25 km

Therefore, the total distance covered by the car is 25 km.

Question 11: Suppose the two photographs, shown in Figure 1 and Figure 2, had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the blue car.

Figure 1 Vehicles moving in the same direction of on a road

Figure 2 Position of vehicles shown in Figure 1 after some time

Answer: The distance covered by the blue car (as evident from the photograph) from one white strip to another, which is measured by scale is 1.4 cm.

It is given that 1 cm is equivalent to 100 m.

Therefore, 1.4 cm is equivalent to 140 m.

Distance travelled by the car = 140 m

Time interval between the two photographs = 10 s

Distance-time graph for the motion of two cars

Answer: Vehicle A is moving faster than vehicle B.

Speed is given by the relation

This relation shows that speed of a vehicle is greater if it covers maximum distance in a given interval of time. To compare the distance, draw a line perpendicular to the time-axis, as shown in the following distance-time graph.

From the graph, it is evident that for a given time t, the distance covered by vehicle A is more than vehicle B. Hence, vehicle A is moving faster than vehicle B.

Question 13: Which of the following distance-time graphs shows a truck moving with speed which is not constant?

Answer: Graph ( iii ) In a distance-time graph, the constant speed of a truck will be represented by a straight line. In a distance-time graph, a straight line parallel to the time axis indicates that the truck is not moving. A curved line on the distance-time graph indicates that the truck is moving with a speed which is not constant.

Extend Learning — Activities and Projects

Question 1:You can make your own sundial and use it to mark the time of the day at your place. First of all find the latitude of your city with the help of an atlas. Cut out a triangular piece of a cardboard such that its one angle is equal to the latitude of your place and the angle opposite to it is a right angle. Fix this piece, called gnomon, vertically along a diameter of a circular board a shown in Fig. 13.16. One way to fix the gnomon could be to make a groove along a diameter on the circular board.

Next, select an open space, which receives sunlight for most of the day. Mark a line on the ground along the North-South direction. Place the sundial in the sun as shown in Fig. 13.16. Mark the position of the tip of the shadow of the gnomon on the circular board as early in the day as possible, say 8:00 AM. Mark the position of the tip of the shadow every hour throughout the day. Draw lines to connect each point marked by you with the centre of the base of the gnomon as shown in Fig. 13.16. Extend the lines on the circular board up to its periphery. You can use this sundial to read the time of the day at your place. Remember that the gnomon should always be placed in the North-South direction as shown in Fig. 13.16.

The activity can be performed as follows:

Find the latitude of the city with the help of Atlas.
Cut out a triangular piece of a cardboard such that its one angle is equal to the latitude of the location and the angle opposite to it is a right angle.
Fix this piece, called gnomon, vertically along a diameter of a circular board by making a groove along a diameter on the circular board.
Choose a space, which receives sunlight for most of the day. Mark a line on the ground along the North-South direction. Place the sundial in the sun
Mark the position of the tip of the shadow of the gnomon on the circular board as early in the day as possible. Mark the position of the tip of the shadow every hour throughout the day. Draw lines to connect each point marked by you with the centre of the base of the gnomon.
Extend the lines on the circular board up to its periphery.
This Sundial can be used for reading the time at chosen place.

Question 2: Collect information about time measuring devices that were used in the ancient times in different parts of the world. Prepare a brief write up on each one of them. The write up may include the name of the device, the place of its origin, the period when it was used, the unit in which the time was measured by it and a drawing or a photograph of the device, if available.

The time measuring devices that were used in the ancient times in different parts of the world are:

2.Water clocks

3.Sand clocks.

Sun Dial: This time measuring device uses a spot of light or shadow by the sun’s position on a reference scale. The prototypes of Sundials are seems to be originated in Russia and they were used in 1830s.

This time measuring device uses regulated water flow of liquid i.e. inflow or outflow of liquid to calculate the time. They are supposed to be existed in 16th Century in Egypt.

Sand Clocks: The sand clocks are supposed to be invented at Alexandria about 150 B.C.

Question 3:Make a model of a sand clock which can measure a time interval of 2 minutes (Fig. 13.17).

1. Take one plastic cup and place it in upside down on a table. Put the other cup on the top of the first one so that the bottom parts of both cups touch each other.

2. Place two lids on the cups and make holes into them. And then invert one cup one another.

3. Measure the sand and put on top of one cup timer. Allow the sand to pass through the holes.

4. Place the cup timer on top of plate and note down the time taken by the sand to pass through the bottom of the timer.

5. Adjust the amount of sand until the time taken by it is 2 minutes for all the sand to pass through the bottom of the timer.

Question 4:You can perform an interesting activity when you visit a park to ride a swing. You will require a watch. Make the swing oscillate without anyone sitting on it. Find its time period in the same way as you did for the pendulum. Make sure that there are no jerks in the motion of the swing. Ask one of your friends to sit on the swing. Push it once and let it swing naturally. Again, measure its time period. Repeat the activity with different persons sitting on the swing. Compare the time period of the swing measured in different cases. What conclusions do you draw from this activity?

Oscillate the swing without any person sitting on it and note down the time period for 5 oscillations.
Ask a person to sit on the swing and note down the time for 5 oscillations.
Repeat the same for different persons.
Calculate the average time taken by dividing to no. of oscillations.

The time period of the swing will be different for different cases. The time period of swing when no one is sitting on it will be least and will depend on the weight of the object sitting on the swing. The higher is the mass of the object on swing, the more will be the time taken by the swing to complete one oscillation because speed becomes less.

NCERT Solutions for Class 7 Science Chapter 13 FAQs

In the world of mechanics, there are four basic types of motion. These four are rotary, oscillating, linear and reciprocating.

The motion of an object is determined by the sum of the forces acting on it; if the total force on the object is not zero, its motion will change. The greater the mass of the object, the greater the force needed to achieve the same change in motion. For any given object, a larger force causes a larger change in motion.

Running, cycling, jumping, swimming, eating, drinking, playing, writing, typing, moving cars, and throwing a ball are all examples of motion.

The three characteristics of motion are: Motion can be defined as the change of position of an object with respect to time. Motion is mainly described in terms of the following terms: distance, displacement, speed, and time.

Random motion is defined as the motion of an object with no specific path. It is a type of motion in which the direction and speed of an object change continuously.

NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants

NCERT Solutions For Class 12 Physics Chapter 10 Wave Optics

A to Z Classes

Cbse, ncert and icse solution online, class 7 science case study question, case study question class 7 science (cbse / ncert board).

Class 7 Science Case Study Question and Answer: CBSE / NCERT Board Class 7 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 7 Science.

There are total 18 chapter Nutrition in Plants, Nutrition in Animals, Fibre to Fabric, Heat, Acids, Bases and Salts, Physical and Chemical Changes, Weather, Climate and Adaptations of Animals to Climate, Winds, Storms and Cyclones, Soil, Respiration in Organisms, Transportation in Animals and Plants, Reproduction in Plants, Motion and Time, Electric Current and Its Effects, Light, Water: A Precious Resource, Forests: Our Lifeline, Wastewater Story

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CBSE Class 7 Science Case Study Question

Chapter 1 Nutrition in Plants Case Study Question
Chapter 2 Nutrition in Animals Case Study Question
Chapter 3 Fibre to Fabric Case Study Question
Chapter 4 Heat Case Study Question
Chapter 5 Acids, Bases and Salts Case Study Question
Chapter 6 Physical and Chemical Changes Case Study Question
Chapter 7 Weather, Climate and Adaptations of Animals to Climate Case Study Question
Chapter 8 Winds, Storms and Cyclones Case Study Question
Chapter 9 Soil Case Study Question
Chapter 10 Respiration in Organisms Case Study Question
Chapter 11 Transportation in Animals and Plants Case Study Question
Chapter 12 Reproduction in Plants Case Study Question
Chapter 13 Motion and Time Case Study Question
Chapter 14 Electric Current and Its Effects
Chapter 15 Light
Chapter 16 Water: A Precious Resource
Chapter 17 Forests: Our Lifeline
Chapter 18 Wastewater Story

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

Important links:

Lakhmir Singh Class 7 Solution
NCERT Class 7 Math Solution

CBSE Class Notes Online – Classnotes123

CBSE Class Notes, Worksheets, Question Answers, Diagrams , Definitions , Diffrence between , Maths Concepts, Science Facts Online – Classnotes123

Chapter 13- Motion and Time–Class 7 science- Question and Answer (Solved MCQs)

Chapter 13- motion and time- extra mcqs (solved worksheet).

1. If a student walks around a circular track and returns to the starting point, what is their displacement?

a) Equal to the circumference of the track

c) Depends on the radius of the track

d) Half the circumference of the track

Answer- b) Zero

Explanation- Displacement is the straight-line distance between the start and end points. In this case, the student ends where they started, so the displacement is zero.

2. Which unit is not used to measure speed?

Answer- d) kg/m

Explanation- Speed is measured in units of distance per time, such as m/s, km/h, or m/min. Kg/m is not a unit of speed but rather implies a unit of mass per unit length.

3. What kind of motion is exhibited by a pendulum?

a) Rectilinear

b) Circular

c) Periodic

Answer- c) Periodic

Explanation- A pendulum exhibits periodic or oscillatory motion, as it moves back and forth in a regular pattern.

4. If a car travels 100 km in 2 hours, its average speed is-

b) 200 km/h

d) 100 km/h

Answer- a) 50 km/h

Explanation- Average speed is calculated as total distance covered divided by total time taken. Here, it’s 100 km / 2 hours = 50 km/h.

5. Which of these is a difference between distance and displacement?

a) Distance can be zero, but displacement cannot.

b) Displacement can be zero, but distance cannot.

c) Distance is measured in km, displacement in m.

d) There’s no difference between the two.

Answer- b) Displacement can be zero, but distance cannot.

Explanation- Displacement can be zero if the start and end points are the same, whereas distance is the total path length travelled and cannot be zero if movement has occurred.

6. What does an odometer measure in a vehicle?

a) Instantaneous speed

b) Average speed

c) Distance travelled

d) Fuel efficiency

Answer- c) Distance travelled

Explanation- An odometer is used to measure the total distance travelled by a vehicle, not its speed or fuel efficiency.

7. What characterises non-uniform motion?

a) Constant speed

b) Changing speed

c) Constant direction

d) Movement in a straight line

Answer- b) Changing speed

Explanation- Non-uniform motion occurs when the speed of an object changes over time due to factors like acceleration or deceleration.

8. Which example best represents uniform motion?

a) A car accelerating on a highway

b) A train moving at a steady speed on a straight track

c) A basketball player running on a court

d) A bird flying in varying directions

Answer- b) A train moving at a steady speed on a straight track

Explanation- Uniform motion is observed when an object moves at a constant speed, such as a train moving at a steady speed on a straight track.

9. How was time estimated in the past using shadows?

a) By the colour of the shadows

b) By the length and direction of shadows

c) By the number of shadows

d) By the movement of shadows per hour

Answer- b) By the length and direction of shadows

Explanation- Before the invention of clocks, people used the changing length and direction of shadows throughout the day to estimate time.

10. What does one oscillation of a pendulum include?

a) Movement in one direction only

b) A full movement to one side, then to the other, and back again

c) Half a swing from the mean position

d) Multiple swings back and forth

Answer- b) A full movement to one side, then to the other, and back again

Explanation- One oscillation of a pendulum is a complete movement from its starting point to one side, then to the other, and back to the starting point.

11. What is the time period of a pendulum?

a) The time it takes for multiple oscillations

b) The time it takes to complete one oscillation

c) The duration of its swing in one direction

d) The time it takes to come to a stop

Answer- b) The time it takes to complete one oscillation

Explanation- The time period of a pendulum is the duration it takes to complete one full oscillation.

12. Which of the following is an example of natural time measurement?

a) Stopwatch

c) Sunrise to sunrise for a day

d) Mechanical clock

Answer- c) Sunrise to sunrise for a day

Explanation- In natural time measurement, a day was defined by the time from one sunrise to the next, relying on the Earth’s rotation

13. How many seconds are there in one hour?

Answer- b) 3600

Explanation- There are 60 seconds in a minute and 60 minutes in an hour, so 60 x 60 = 3600 seconds.

14. What is the basic unit of speed?

a) Kilometre per hour

b) Metre per minute

c) Metre per second

d) Second per metre

Answer- c) Metre per second

Explanation- Speed is distance over time; hence the basic unit of speed is metre per second (m/s).

15. If a healthy adult’s heart beats about 72 times per minute, how many beats are there in 10 seconds?

Answer- b) 12

Explanation- 72 beats per minute equates to 72/60 = 1.2 beats per second, so in 10 seconds, it would be 12 beats.

16. What type of graph is best used for showing trends over time?

a) Bar Graph

b) Pie Chart

c) Line Graph

d) Scatter Plot

Answer- c) Line Graph

Explanation- Line graphs are effective for displaying trends over time, as they connect data points and show a pattern or trend.

17. A microsecond is one millionth of a second. What is a nanosecond?

a) One hundredth of a second

b) One thousandth of a second

c) One millionth of a second

d) One billionth of a second

Answer- d) One billionth of a second

Explanation- A nanosecond is one billionth (1/1,000,000,000) of a second.

18. In a bar graph, what does the height or length of a bar represent?

a) Time interval

b) Proportion of the whole

c) Quantity or amount

d) Speed of an object

Answer- c) Quantity or amount

Explanation- In a bar graph, the length or height of each bar signifies the quantity or amount of what is being measured.

19. What is the purpose of using a pie chart?

a) To show quantities over time

b) To display proportions of a whole

c) To compare different speeds

d) To measure large time intervals

Answer- b) To display proportions of a whole

Explanation- Pie charts are used to show how a whole is divided into different proportions or parts.

20. Which timekeeping method was used before clocks, based on the sun’s position?

a) Water clocks

b) Observation of shadows

c) Sundials

d) Hourglasses

Answer- b) Observation of shadows

Explanation- Before clocks, people estimated time by observing the length and direction of shadows created by the sun’s position.

21. What does a horizontal line on a distance-time graph indicate?

a) Acceleration

b) Deceleration

c) Constant speed

d) Stationary object

Answer- d) Stationary object

Explanation- A horizontal line on a distance-time graph means no distance is being covered over time, indicating the object is stationary.

22. On a distance-time graph, what does a steeper line represent?

a) Slower speed

b) Higher speed

c) Uniform speed

d) No movement

Answer- b) Higher speed

Explanation- The slope of the line on a distance-time graph represents the speed of the object. A steeper slope indicates a higher speed.

23. What does a straight line on a distance-time graph suggest about the motion of the object?

a) The object is accelerating

b) The object is decelerating

c) The object is moving at a constant speed

d) The object is stationary

Answer- c) The object is moving at a constant speed

Explanation- A straight line on a distance-time graph indicates uniform motion, where the object is moving at a constant speed.

24. If a car moves 1 km every minute, how would its motion be represented on a distance-time graph?

a) A curved line sloping upwards

b) A horizontal line

c) A straight line sloping upwards

d) A straight line sloping downwards

Answer- c) A straight line sloping upwards

Explanation- Since the car is moving 1 km every minute consistently, it indicates constant speed. This is represented by a straight line sloping upwards.

25. In an experiment with a pendulum, if the total time for 10 oscillations is 20 seconds, what is the average time period for one oscillation?

a) 2 seconds

b) 10 seconds

c) 0.5 seconds

d) 20 seconds

Answer- a) 2 seconds

Explanation- The average time period for one oscillation is calculated by dividing the total time by the number of oscillations, which is 20 seconds / 10 oscillations = 2 seconds.

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MCQ Questions for Class 7 Science Chapter 13 Motion and Time with Answers

We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 13 Motion and Time with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Motion and Time Class 7 MCQs Questions with Answers here along with a detailed explanation.

Motion and Time Class 7 MCQs Questions with Answers

Choose the correct option.

Question 1. The formula for distance is (a) distance = $\frac {time}{speed}$ (b) distance = $\frac {speed}{time}$ (c) distance = $\frac {1}{speed}$ x time (d) distance = speed × time

Answer: (d) distance = speed × time

Question 2. The distance travelled by the vehicles is recorded by (a) monometer (b) odometer (c) speedometer (d) motometer

Answer: (b) odometer

Question 3. A bus travels 54 km in 90 minutes. The speed of the bus is (a) 0.6 m/s (b) 10 m/s (c) 5.4 m/s (d) 3.6 m/s

Answer: (b) 10 m/s

Question 4. The clocks and watches which are used for measuring time are based on (a) rectilinear motion (b) circular motion (c) periodic motion (d) rotational motion

Answer: (c) periodic motion

Question 5. The device which is used for measuring time intervals in sports activities is called (a) wrist watch (b) stop watch (c) stop clock (d) quartz watch

Answer: (b) stop watch

Question 6. If the speed of an object along a straight line keeps changing, its motion is said to be (a) uniform motion (b) non-uniform motion (c) linear motion (d) none of these

Answer: (b) non-uniform motion

Question 7. The most well known periodic motion is that of (a) sundial (b) stop watch (c) simple pendulum (d) sand clock

Answer: (c) simple pendulum

Question 8. Which of the following is based on the study of the shadow cast by the sun? (a) Simple pendulum (b) Atomic clock (c) Sun dial (d) Quartz clock

Answer: (c) Sun dial

Question 9. The most appropriate unit for expressing the speed of a space rocket is (a) m/s (b) km/s (c) km/h (d) km/min

Answer: (b) km/s

Question 10. Swami walks to his school which is at a distance of 4 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back in his friend’s vehicle to home in 10 minutes. His average speed in km/h is (a) 8 km/h (b) 24 km/h (c) 16 km/h (d) 20 km/h

Answer: (c) 16 km/h

Question 11. When an object changes position with time, it is said to be in (a) rest (b) stationary (c) circle (d) motion

Answer: (d) motion

Question 12. A motion in a straight line in a fixed direction represents a (a) circular motion (b) uniform motion (c) non-uniform motion (d) periodic motion

Answer: (b) uniform motion

Question 13. A simple pendulum executes a (a) periodic motion (b) oscillatory motion (c) both (a) and (b) (d) none of these

Answer: (c) both (a) and (b)

Question 14. The distance-time graph of an object under uniform motion is a (a) curved line (b) straight line (c) circle (d) parabola

Answer: (b) straight line

Question 15. The S.I unit of speed is (a) m/s (b) km/h (c) m/h (d) km/s

Answer: (a) m/s

Question 16. Which of the following measures the most accurate time? (a) Sand clock (b) Water clock (c) Quartz clock (d) Sundial

Answer: (c) Quartz clock

Question 17. All oscillatory motions are (a) rotatory motions (b) rectilinear motions (c) circular motions (d) periodic motions

Answer: (d) periodic motions

Question 18. The motion of the moon around the earth represents a (a) periodic motion (b) oscillatory motion (c) curvilinear motion (d) none of these

Answer: (a) periodic motion

Question 19. Which of the following is the S.I unit of distance? (a) km (b) m (c) cm (d) mm

Answer: (b) m

Question 20. The motion of the spikes in the wheels of a moving cycle is (a) rectilinear motion (b) circular motion (c) oscillatory motion (d) none of these

Answer: (b) circular motion

Fill in the blanks with suitable words.

Question 1. The time taken by the pendulum to complete one oscillation is called its ………………

Answer: time period

Question 2. ……………… is the SI unit of time.

Answer: Second

Question 3. The distance moved by an object in a unit time is called its ………………

Answer: speed

Question 4. Speed of the vehicle is shown by the instrument ……………… fitted on the vehicle.

Answer: speedometer

Question 5. Distance time-graph representing a non-uniform motion of an object is of ……………… shape.

Answer: any

Question 6. The distance-time graph for the motion of an object moving with a constant speed is a ………………

Answer: straight line

Question 7. SI unit of speed is ………………

Answer: m/s

Question 8. Motion of objects can be presented in a pictorial form by their ……………… graph.

Answer: distance-time

Question 9. If an object covers 4 km in 4 minutes its speed is ……………… m/s and ……………… km/h.

Answer: 16.6; 60

Question 10. In a simple pendulum, the metallic ball suspended by thread is called its ………………

Answer: bob

Question 11. The metallic ball of the pendulum is called the ……………………..

Answer: Bob

Question 12. The distance-time graph for the motion of an object moving with a constant speed is a …………………….. line.

Answer: straight

Question 13. The S.I unit of speed is ……………………..

Answer: metre per second

Question 14. The symbols of all units are written in ……………………..

Answer: Singular

Question 15. The time period of a pendulum depend on its ……………………..

Answer: length

Question 16. Hands of a clock represent …………………….. motion.

Answer: circular

Question 17. Nowadays, clocks use …………………….. crystals to measure time.

Answer: quartz

True or False

Question 1. Each and every object in this universe moves with a constant speed.

Answer: False

Question 2. The motion of a spinning top is rotational motion.

Answer: True

Question 3. The motion of earth around the sun is called rectilinear motion.

Question 4. The smallest time interval which can be measured with commonly available clocks and watches is one second.

Question 5. A sundial measures time by the position of the shadow cast by the sun.

Question 6. Vehicles which covers more distance in small interval of time have slow speed.

Question 7. Periodic motion is used to measure time.

Question 8. The symbols of all units are written in singular.

Question 9. All clocks make use of some periodic motion.

Question 10. The basic unit of speed is km/min.

Question 11. Rectilinear motion is a straight line motion.

Question 12. Odometer measures the speed of a vehicle.

Question 13. All oscillatory motions are periodic motions.

Question 14. Distance-time graph for non-uniform motion is a straight line.

Question 15. The speed of a train is expressed in m/h.

Question 16. Clocks that measure very small time intervals are used for scientific research.

Question 17. Second is the smallest unit of time.

Match the Following

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CBSE Notes For Class 7
CBSE Class 7 Science Notes
Chapter 13: Motion And Time

Motion and Time Class 7 Science Notes - Chapter 13

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 9.

An Introduction to Motion

Distance is the total path covered by the object in the given interval of time.
Displacement is the shortest path covered by the moving object in the given interval of time.
Distance=Speed × Time.
Unit of distance is generally measured in units of length like metres, kilometres etc.

Introduction to Motion

An object is said to be in motion if it changes its position with respect to time. For example, A car moving on a road.
An object is said to be at rest if the object does not change its position with time. For example, A person standing on the ground.

For more information on Motion, watch the below videos

To know more about Motion, visit here .

Basics of Standard Units

Units and their standardization.

The standard unit of distance is in metres.
The standard unit of time is in seconds (s).
The standard unit of speed is in metres per second (m/s).

To know more about Standard Units of Measurement, visit here .

Basics of Motion and Its Types

Types of motion.

Types of motion are generally divided into 3. They are:

1. Rectilinear/translatory motion : When a body is moving in a straight line without changing its direction, then the body is said to possess translatory/rectilinear motion. For example, A car moving on a straight road.

2. Circular motion : When a body moves in the shape of a circle about a fixed point and a fixed radius, then the body is said to be in a circular motion. For example, the motion of planets around the sun.

3. Period / Oscillatory motion: When the motion of a body repeats after fixed intervals of time, then the body is said to be in the periodic/oscillatory motion. For example, the To and fro motion of a simple pendulum.

To know more about the Type of Motion, visit here .

Periodic or Oscillatory Motion

Periodic or oscillatory motion is the motion in which a body repeats its motion after fixed intervals of time.
For example, the To and fro motion of a simple pendulum, the Motion of a car in a circular path, Motion of planets around the sun.

To know more about Oscillatory Motion, visit here .

Oscillations of a Simple Pendulum

When the bob of a simple pendulum moves from its mean position B to A and back to B again, then from B to C and back to B again, the pendulum is said to complete 1 oscillation.
In the case of the simple pendulum, the time period is the total time taken by the pendulum to complete one oscillation.

Time and Speed

Speed (average speed).

Speed is the total distance travelled by the object in a given interval of time.
Speed = Distance travelled/time taken.
The unit of speed is generally measured in metres per second(m/s), kilometres per hour(km/h).

For more information on Average Speed and Velocity, watch the below video

Uniform and Non-Uniform Motion

1. Uniform motion : When an object moving along a straight line moves with a constant speed, then the object is said to be in uniform motion. For example, A car moving in a straight line with a constant speed.

2. Non-uniform motion : When an object moving along a straight line changes its speed with respect to time, then the object is said to be in uniform motion. For example, The motion of a train.

For more information on Uniform and Non-Uniform Motion, watch the below video

To know more about Uniform and Non-Uniform Motion, visit here .

Measurement of Time

The unit of time is generally measured in seconds, minutes, and hours.

The time period is the total time taken by an object to complete one oscillation.

Units of Time

Units of speed.

Speed = Distance travelled in the total time interval.
The unit of speed is generally measured in metres per second (m/s) and km/h( kilometre per hour).

Speedometer and Odometer

The speedometer records the speed of the vehicle directly in kilometres per hour (km/h).
An odometer measures the distance moved by the vehicle directly in kilometres(km).

Visualizing Motion

Distance-time graph.

A distance-time graph is a graph plotted between the distance( in the y-axis) and time ( in the x-axis).
The slope of a distance-time graph gives the speed of an object.

Frequently Asked Questions on CBSE Class 7 Science Notes Chapter 13 Motion and Time

What is rectilinear motion.

It is a type of linear motion in which the direction of the velocity remains constant, and the path is a straight line.

What is the average speed?

Average speed is calculated by dividing the total distance that something has travelled by the total amount of time it took it to travel that distance.

What are the uses of uniform motion?

If an object is travelling with uniform motion, it is moving in a straight line at a constant speed.

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Case Study Questions for Class 7 Science Chapter 13 Motion and Time
[Download] Case Study Questions for Class 7 Science Chapter 13 Motion and Time. Here we are providing case study or passage-based questions for class 7 science chapter 13 Motion and Time. Case Study/Passage Based Questions. Passage-1. The smallest time interval that can be measured with commonly available clocks and watches is one second.
Motion and Time Class 7 Extra Questions Science Chapter 13
Motion and Time Class 7 Science Extra Questions Very Short Answer Type Questions. Question 1. Give the basic unit of speed. Answer: Metre/second is the basic unit of speed. Question 2. Mention which is the most common thing in almost all the clocks.
Important Questions Class 7 Science Chapter 13
The following Chapter 13 Class 7 Science Important Questions are provided for students to help them better understand Chapter 13- motion and time. Question 1: Classify the following motions as straight line, circular, or oscillatory: (a) Hand motion while sprinting. (b) The motion of a horse while pulling a cart along a straight road.
Extra Questions for Class 7 Science Chapter 13 Motion And Time
What is distance-time graph? Answer: Distance-time graph represents the speed of an object. 5. What is speed? Answer: The distance moved by an object in a unit time is called its speed. 6. What is oscillatory motion? Answer: The to and fro motion of an object is called oscillatory motion. 7.
NCERT Exemplar Solutions Class 7 Science Chapter 13 Motion and Time
NCERT Exemplar Solutions for Class 7 Science Chapter 13 Motion and Time covers questions on types of motion, speed measurement, distance-time graph and the effect of speed and motion on our daily lives. This exemplar solution has questions on important derivations, numerical problems and graphs. Topics Covered in NCERT Exemplar Solutions for ...
Important Questions for CBSE Class 7 Science Chapter 13
The Class 7 Science Chapter 13 important questions are simple and structured to be easy for the layman student to understand the core concepts of the chapter. The questions & solutions are aimed at improving the speed and accuracy of students. The variety of exercises are included in the PDF to help students understand how to answer different ...
Class 7 Science Chapter 13 Motion and Time
Here are extra questions from NCERT Class 7 Science Chapter 13 Motion and Time. 1. What is speed? The distance covered by an object in a unit of time is the speed of that object. It is calculated by dividing the total distance covered by the total time taken.
NCERT Solutions for Class 7 Science Chapter 13 Motion and Time
Class 7 Science Chapter 13 Motion and Time NCERT Solutions. Class 7 NCERT Solutions for Science Chapter 13 includes all the intext and exercise questions. All these questions are solved by experts with a detailed explanation that will help students complete their assignments and homework. Question 1: Classify the following as motion along a ...
Motion and Time Important Questions Class 7 Science Chapter 13
13: One complete to and fro motion of a pendulum from rest position is called one______________. Answer: One oscillation. 14: Give an example of vibratory motion. Answer: The movement of strings in musical instruments like guitar or sitar. 15: Name the device on vehicles to track the distance covered.
NCERT Solutions for Class 7 SCIENCE
NCERT SOLUTIONS- MOTION AND TIME NCERT Solutions for Class 7 Science Chapter 13 Motion and Time is the essential study material to perfect Motion and Time topics. The NCERT Class 7 Science solutions provided here correctly answer NCERT textbook questions. Solutions curated comprehensively will help students understand the subtopics in this chapter in a better
NCERT Solutions for Class 7 Science Chapter 13
Revision Notes. Topics Covered in NCERT Solutions Class 7 Science Chapter 13: Motion and Time. The following topics are discussed in Chapter 13 of Class 7 Science. Introduction to motion. Introduction to the concept of distance and displacement. Introduction to speed. Measurement of time. Units of time and speed.
Motion and Time Class 7 Extra Questions and Answers Science Chapter 13
Motion and Time Class 7 Extra Questions Long Answer Type. Question 1. State the difference between uniform motion and non-uniform motion. Answer: Non-uniform motion. Uniform motion. (i) If the speed of an object moving along a straight line keeps changing, then this type of motion is called non-uniform motion.
NCERT Solutions For Class 7 Science Chapter 13 : Motion and Time
Access Answers to NCERT Solutions for Class 7 Science Chapter 13 Motion and Time. Exercise Questions. 1. Classify the following as motion along a straight line, circular or oscillatory motion: (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a merry-go-round.
NCERT Solutions Class 7 Science Chapter 13 Motion and Time
Topics and Sub Topics in Class 7 Science Chapter 13 Motion and Time: (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a merry-go-round. (iv) Motion of a child on a see-saw. (v) Motion of the hammer of an electric bell. (vi) Motion of a train on a straight bridge.
NCERT Solutions for Class 7 Science Chapter 13-Motion and Time
Chapter 13 - Motion and Time - Textbook Exercise (Solved)" offers clear, concise solutions to class 7 physics exercises. Tailored for young learners, this article simplifies complex concepts of motion and time, providing easy-to-understand answers. It's an ideal resource for students seeking to grasp the fundamentals of physics and excel in their academic journey in a fun, engaging way.
NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF Download
Solving questions from the NCERT Solutions for Class 7 Science Chapter 13 Motion and Time PDF can assist students to grasp the important concepts. Students can solve Chapter 13 Motion and Time questions from their comfort zone through the Selfstudys website as it is available in the portable document format. After solving questions of Chapter ...
Motion and Time Class 7 Extra Questions and Answers Science Chapter 13
Motion and Time Class 7 Extra Questions Very Short Answer Type. Question 1. Write formula for speed. Answer: Speed = Total distance travelled total time taken. Question 2. Define a day. Answer: The time between one sunrise and the next is called a day.
NCERT Solutions for Class 7 Science Chapter 13 Motion and Time
1800m = 1/1000 x 1800 = 1.8 km. Question 7: Show the shape of the distance-time graph for the motion in the following cases: (i) A car moving with a constant speed. (ii) A car parked on a side road. Answer: (i) A car moving with a constant speed covers equal distance in equal intervals of time. Such motion of car is represented in the given ...
Class 7 Science Case Study Question
CBSE Class 7 Science Case Study Question. Chapter 1 Nutrition in Plants Case Study Question. Chapter 2 Nutrition in Animals Case Study Question. Chapter 3 Fibre to Fabric Case Study Question. Chapter 4 Heat Case Study Question. Chapter 5 Acids, Bases and Salts Case Study Question. Chapter 6 Physical and Chemical Changes Case Study Question.
Chapter 13- Motion and Time-Class 7 science- Question and Answer
Explore our comprehensive guide, 'Chapter 13 - Motion and Time - Class 7 Science: Question and Answer (Solved MCQs)'. This resource offers detailed, easy-to-understand explanations for each multiple-choice question, enhancing students' grasp of key concepts in motion and time. Perfect for exam preparation and concept reinforcement, it's an essential tool for Class 7 learners delving into the ...
MCQ Questions for Class 7 Science Chapter 13 Motion and Time with
Motion and Time Class 7 MCQs Questions with Answers. Choose the correct option. Question 1. The formula for distance is. (a) distance = time speed. (b) distance = speed time. (c) distance = 1 speed x time. (d) distance = speed × time. Answer.
Motion and Time Class 7 Science Notes
2. Circular motion: When a body moves in the shape of a circle about a fixed point and a fixed radius, then the body is said to be in a circular motion. For example, the motion of planets around the sun. 3. Period / Oscillatory motion: When the motion of a body repeats after fixed intervals of time, then the body is said to be in the periodic ...

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Motion and Time Important Questions Class 7 Science Chapter 13

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NCERT Solutions for Class 7 Science Chapter 13 - Motion and Time FREE PDF Download

Access NCERT Solutions for Class 7 Science Chapter 13 – Motion and Time

NCERT Solutions for Class 7 Science – Free PDF Download

Chapter 13 – Motion and Time

13.1 Slow or Fast

13.3 Measurement of Time

Units of Time and Speed

13.4 Measuring Speed

13.5 Distance - Time Graph

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Motion and Time Class 7 Extra Questions and Answers Science Chapter 13

Class 7 Science Chapter 13 Extra Questions and Answers Motion and Time

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NCERT Solutions for Class 7 Science Chapter 13 Motion and Time

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