Motion and Time Class 7 Science Part 1 Chapter 4 Questions & Answers Assam State Education Board Syllabus 2025-2026 Covered
Understanding motion and time is crucial in science as it helps us analyze movement and measure changes over time. This chapter introduces different types of motion, speed, time measurement, and the importance of clocks in scientific studies. Below are the important questions and answers from NCERT & SCERT Assam Class 7 Science Chapter 4 - Motion and Time, based on the Assam State Education Board syllabus for 2025-2026.
Get Free NCERT PDFs
If you want to download free PDFs of any chapter from any subject, click the link below and join our WhatsApp.
Join Our WhatsAppIntroduction to Motion and Time
Motion is the change in the position of an object with respect to time. Time is an essential physical quantity used to measure events and compare different motions. In this chapter, we explore different types of motion and methods of measuring time.
Class 7 Science Question Answer – Part I All Chapters
Below are the chapters of Class 7 Science. Click on the chapter name to access the respective question-and-answer content:
- Nutrition in Plants
- Nutrition in Animals
- Heat
- Motion and Time
- Acids, Bases and Salts
- Physical and Chemical Changes
- Weather, Climate and Adaptations of Animals to Climate
- Winds, Storms and Cyclones
- Soil
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 Motion
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:
(ii) Every object moves with a constant speed.
(iv) The time period of a given pendulum is constant.
(v) The speed of a train is expressed in m/h.
3. A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
Solution:
Number of oscillations = 20
Total time taken to complete 20 oscillations = 32 s
We Know That,
4. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
Solution:
Distance between two stations = 240 kms
Total time take = 4 hrs
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.
Solution:
Initial reading of the odometer = 57321.0
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 kms
Starting time of car is 8:30 and it stops at 8:50
Hence, time taken by car = 20 mins = 0.33 hours
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.
Solution:
Time taken by Salma to reach her school by bicycle = 15 mins
= 15 x 60 = 90 s
Speed of Salma’s bicycle = 2ms-1
Distance covered = speed × time taken
= 2 × 900 = 1800 m
In Kilometre
1000m = 1 km
distance covered = 1.8 kms
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.
Solution:
(i)
(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
Solution: (ii) Speed = Distance/Time
9. The basic unit of speed is:
(i) km/min
(ii) m/min
(iii) km/h
(iv) m/s
Solution: (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
Solution: (ii) 25 km
Calculation:
When the speed of the car is 40 km/h
= 15/60
= 0.25
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.
Solution:
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
Speed formula = 120/10
= 12 m/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?
Distance time graph
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 :- (iii)
About the Author
Lokesh Chandra Das is a passionate Teacher at Digital Pipal Academy. An expert in Chemistry, he creates engaging video lectures and offers insightful content to help students excel in their studies. Lokesh also specializes in typing and preparing educational material for the academy.
About the Content Reviewer
Hi! I'm Sudev Chandra Das (B.Sc. Mathematics), the Founder of Digital Pipal Academy.
I've dedicated myself to guiding students toward better education. I believe,
'Success comes from preparation, hard work, and learning from failure.'
Let’s embark on a journey of growth and digital excellence together!
About the Content Reviewer
Hi! I'm Sudev Chandra Das (B.Sc. Mathematics), the Founder of Digital Pipal Academy. I've dedicated myself to guiding students toward better education. I believe, 'Success comes from preparation, hard work, and learning from failure.' Let’s embark on a journey of growth and digital excellence together!
Note for Users
If you find any incorrect answers, please notify us via Instagram at @pipalacademy or email us at info@pipalacademy.com. For content that may infringe copyright, kindly refrain from copying our content. Thank you for supporting Digital Pipal Academy!
Join Our WhatsApp
Note for Users
If you find any incorrect answers, please notify us via Instagram at @pipalacademy or email us at info@pipalacademy.com. For content that may infringe copyright, kindly refrain from copying our content. Thank you for supporting Digital Pipal Academy!
Join Our WhatsAppClass 7 Science Chapter 4 - Important Questions & Answers
Q1: What is motion?
Answer: Motion is the change in the position of an object with respect to time when observed from a reference point.
Q2: What are the different types of motion?
Answer: The different types of motion are:
Circular Motion: Motion around a fixed point (e.g., the hands of a clock).
Periodic Motion: Motion that repeats at regular intervals (e.g., a pendulum).
Q3: What is speed? How is it calculated?
Answer: Speed is the distance covered by an object per unit time. It is calculated using the formula: Speed is measured in meters per second (m/s) or kilometers per hour (km/h).
Q4: What is the difference between speed and velocity?
Answer:
Velocity is speed in a particular direction and has both magnitude and direction.
Q5: What is a simple pendulum?
Answer: A simple pendulum consists of a small mass (bob) attached to a string that swings back and forth. It exhibits periodic motion, and the time taken to complete one full swing is called the time period.
Q6: What is uniform and non-uniform motion?
Answer:
Non-Uniform Motion: An object covers unequal distances in equal intervals of time (e.g., a cyclist slowing down or speeding up).
Q7: What is a speedometer and an odometer?
Answer:
Odometer: Measures the total distance traveled by a vehicle.
Q8: How is time measured?
Answer: Time is measured using clocks and watches. Ancient devices like sundials and water clocks were also used before modern timekeeping devices.
FAQs on Motion and Time
Q1: Why is it important to measure time?
Answer: Measuring time helps in scientific studies, scheduling activities, and understanding motion in daily life.
Q2: What factors affect the time period of a pendulum?
Answer: The time period of a pendulum depends on the length of the string. A longer string increases the time period, while a shorter string decreases it.
Q3: Can an object be in motion and still appear stationary?
Answer: Yes, if two objects are moving at the same speed in the same direction, they appear stationary relative to each other.
Q4: What is acceleration?
Answer: Acceleration is the rate of change of velocity. It is calculated as: It is measured in meters per second squared (m/s²).
Q5: Why do we use km/h instead of m/s in daily life?
Answer: Kilometers per hour (km/h) is more practical for measuring vehicle speeds, as roads and distances are measured in kilometers.
Why Choose Digital Pipal Academy?
At Digital Pipal Academy, we provide:
✅ Detailed NCERT & SCERT solutions.
✅ Easy explanations with real-world examples.
✅ Exam-focused content for SEBA Board students.
✅ Free and accessible learning materials.
✅ Regular updates and syllabus coverage.
For more SEBA Class 7 Science solutions, visit Digital Pipal Academy and stay updated with our latest educational resources.
📌 Related Posts:
.png)
