NCERT Solutions for Class 7 Science Chapter 9 Motion and Time

In earlier classes, like Class 6, we got a basic idea about different types of motion—like straight-line motion, circular motion, and more. But in Class 7 Science Chapter 9, titled Motion and Time, we take a deeper dive into how objects move and how we measure that movement. This chapter explains important concepts such as speed, the measurement of time, the working of a simple pendulum, and how to read and draw a distance-time graph.

The Motion and Time Class 7 NCERT Solutions help students understand these concepts with clarity through step-by-step answers to textbook questions. Whether it’s calculating speed, understanding the unit of time, or figuring out how motion is shown on a graph, these solutions are a perfect companion for exam prep and everyday learning.

If you're looking for clear, easy-to-follow explanations, our Motion and Time Class 7 NCERT-based answers are just what you need. Practice this topic with our Class 7th Science Chapter 9 guide to make learning Motion and Time not only simple but also effective for your upcoming exams.

NCERT Solutions for Class 7 Science Chapter 9 Motion and Time Download PDF (2025-26)

The NCERT Solutions for Class 7 Science Chapter 9 Motion and Time are a must-have resource for students aiming to build a strong understanding of how objects move and how we measure that movement. These solutions cover all the important Motion and Time Class 7 questions with answers, helping students grasp key concepts like speed, time measurement, and distance-time graphs in a simple and clear way.

If one wants to secure good marks in the Class 7 exam, then NCERT solutions are one of the most important study resources. Students can download the PDF for this chapter here and practice questions at their own pace. 

These solutions are carefully prepared by expert faculty at Infinity Learn after thoroughly understanding the core concepts of the chapter. Once students go through these Motion and Time Class 7 solutions, they can download the NCERT Solutions for Class 7 Science Chapter 9 PDF and start their preparation with confidence.

Motion and Time Class 7 Questions with Answers

1. Mention the type of motion in each case:
(i) The blades of a helicopter in flight
(ii) A train moving along a straight railway track
(iii) A guitar string being plucked
(iv) The hour hand of a wristwatch
(v) A ball dropped from a height and bouncing back up

Solution:
(i) Rotational motion
(ii) Linear motion
(iii) Vibratory motion
(iv) Circular motion
(v) Periodic motion

2. A van covers 54 km in 1.5 hours. Find its speed in km/h and m/s.
Solution: Speed = 54 ÷ 1.5 = 36 km/h
To convert to m/s: 36 × (1000 ÷ 3600) = 10 m/s

A car travels 240 km in 4 hours. Calculate its speed.
Solution:
Speed = 240 ÷ 4 = 60 km/h

A simple pendulum completes 20 oscillations in 40 seconds. What is its time period?
Solution:
Time period = 40 ÷ 20 = 2 seconds

3. A Bullock cart covers 900 meters in 3 minutes. What is his speed in m/s?
Solution: Distance = 900 m
Time = 3 minutes = 180 seconds
Speed = 900 ÷ 180 = 5 m/s

4. A girl walks 2.4 km in 40 minutes. What’s her speed in km/h?
Solution: Time = 40 minutes = 40/60 = 0.67 hours
Speed = 2.4 ÷ 0.67 ≈ 3.6 km/h

5. If a boat travels at 20 km/h, how far can it go in 3 hours?
Solution: Distance = 20 × 3 = 60 km

6. A motorbike travels 180 km in 3 hours. What’s its average speed?
Solution: Average speed = 180 ÷ 3 = 60 km/h

7. What kind of motion does a Ferris wheel show?
Solution: Circular motion

8. A car drives at 60 km/h. How far does it go in 30 minutes?
Solution: Time = 30 minutes = 0.5 hours
Distance = 60 × 0.5 = 30 km

9. A clock’s second hand makes 120 revolutions in 2 hours. What’s the time for one revolution?
Solution: Total time = 2 hours = 7200 seconds
Time period = 7200 ÷ 120 = 60 seconds

10. Convert a speed of 72 km/h to m/s.
Solution: 1 km/h = 5/18 m/s
72 × 5/18 = 20 m/s

11. A train covers 120 km in 2 hours, then another 60 km in 1.5 hours. What is the average speed of the train?
A) 60 km/h
B) 55 km/h
C) 48 km/h
D) 50 km/h

Answer: D) 50 km/h
Solution: Total distance = 120 + 60 = 180 km
Total time = 2 + 1.5 = 3.5 h
Average speed = 180 ÷ 3.5 = 51.43 km/h (≈ 50 km/h)

12. A simple pendulum completes 40 oscillations in 80 seconds. Which of the following is correct?
A) Frequency is 2 Hz
B) Time period is 0.5 s
C) Time period is 2 s
D) It performs uniform motion

Answer: B) Time period is 0.5 s
Solution: Time period = Time ÷ Oscillations = 80 ÷ 40 = 0.5 s

13. If a cyclist covers 3 km in 10 minutes, then 2 km in 5 minutes, and 1 km in 2.5 minutes, what is their average speed in km/h?
A) 36 km/h
B) 30 km/h
C) 24 km/h
D) 40 km/h

Answer: B) 30 km/h
Solution:
Total distance = 6 km
Total time = 10 + 5 + 2.5 = 17.5 min = 17.5 ÷ 60 = 0.2917 h
Speed = 6 ÷ 0.2917 ≈ 30 km/h

14. Imagine two cars taking off from the same starting line. Car A is cruising at 50 km/h, while Car B is speeding along at 70 km/h. So, how long will it take for Car B to pull ahead by 60 km?
A) 2 hours
B) 3 hours
C) 1 hour
D) 4 hours

Answer: A) 2 hours
Solution: Relative speed = 70 - 50 = 20 km/h
Time = 60 ÷ 20 = 3 hours

15. A student draws a distance-time graph of a moving car. She notices the graph is a straight line slanting upward. What physical quantity does the steepness (slope) of this line indicate?
A) Distance
B) Time
C) Speed
D) Acceleration

Answer: C) Speed
Explanation:
Slope = change in distance / change in time = Speed

Important topics covered in Class 7 Science chapter 9 NCERT Solution

1. In this chapter, students dive into the fascinating world of motion, exploring various types like linear (straight-line) motion, circular motion, and oscillatory motion. For instance, think about a car cruising down the road for linear motion, a fan blade spinning around for circular motion, and a swing swaying back and forth for oscillatory motion.

2. Next up is speed, which tells us just how fast something is moving. We figure it out by dividing the distance traveled by the time it took. The formula looks like this:
Speed = Distance ÷ Time. Understanding speed is crucial because it allows us to compare how quickly different objects are moving.

3. When it comes to measuring time, we rely on clocks and watches. Time is typically measured in seconds, minutes, and hours, with the second being the fundamental unit. This section covers how timekeeping has evolved over the years and why precision is so important.

4. Moving on to measuring speed, this part teaches students how to use the speed formula and the units like m/s (meters per second) or km/h (kilometers per hour). Real-life examples, such as the speed of cars or how fast we walk, help make these concepts clearer.

5. In the units of speed and time section, students become familiar with the standard measurements. Speed is typically measured in meters per second (m/s) or kilometers per hour (km/h), while time can be expressed in seconds (s), minutes, or hours (h). Understanding these units is crucial for solving numerical problems effectively.

6. The time period of a simple pendulum is another intriguing topic. Here, students learn about a pendulum, which is a weight that swings back and forth. They discover how to measure its time period—the duration it takes to complete one full swing—and see how it fits into the category of oscillatory motion.

7. Lastly, distance-time graphs provide a visual representation of how far an object travels over time. A straight line going up indicates uniform speed, while a flat line shows that the object is stationary. 

These topics form the backbone of the Motion and Time chapter for Class 7, and they’re clearly explained in the Class 7 Science Chapter 9 NCERT Solutions, making it easier for students to prepare for their exams.