Official Class 7 Science Worksheets: Chapter 13 Motion and Time
Access printable practice worksheets for Chapter 13 Motion and Time designed to align with the 2026-27 academic syllabus for Class 7 Science. These structured exercises help students evaluate their conceptual understanding and improve exam readiness.
Chapter-wise Practice Material: Chapter 13 Motion and Time
View or download the dedicated Chapter 13 Motion and Time practice resource below. Engaging with these objective and subjective questions daily ensures continuous academic progress and mastery of the 2026-27 curriculum.
Questions
Section A: Multiple Choice Questions
Choose the correct option.
Q1. The motion of a simple pendulum is ______. [1 mark]
(a) circular
(b) rectilinear
(c) oscillatory
(d) random
View Answer & Explanation
Answer: (c) oscillatory. The bob swings to and fro about its mean position.
Teacher's Note:
1. The motion is periodic as well.
2. One complete to and fro is one oscillation.
Q2. The unit of speed in the SI system is ______. [1 mark]
(a) km/h
(b) m/s
(c) m
(d) s
View Answer & Explanation
Answer: (b) m/s. Speed is distance in metres divided by time in seconds.
Teacher's Note:
1. Speed in km/h can be changed to m/s by multiplying by 5/18.
2. Vehicles often show speed in km/h.
Q3. Speed is equal to ______. [1 mark]
(a) distance ÷ time
(b) time ÷ distance
(c) distance × time
(d) distance + time
View Answer & Explanation
Answer: (a) distance ÷ time. Speed is the distance covered per unit time.
Teacher's Note:
1. Distance = speed × time follows from this.
2. Time = distance ÷ speed.
Q4. The time period of a simple pendulum depends on its ______. [1 mark]
(a) mass of the bob
(b) material of the bob
(c) length
(d) small change in amplitude
View Answer & Explanation
Answer: (c) length. Time period increases with the length of the pendulum.
Teacher's Note:
1. It does not depend on the bob's mass or material.
2. It changes with the length because T is proportional to the square root of L.
Q5. If the length of a simple pendulum is made four times, its time period becomes ______. [1 mark]
(a) the same
(b) two times
(c) four times
(d) half
View Answer & Explanation
Answer: (b) two times. T is proportional to the square root of the length, so 4 times the length gives 2 times the period.
Teacher's Note:
1. √4 = 2.
2. This is why long pendulums swing slowly.
Q6. A body travels equal distances in equal intervals of time. Its speed is ______. [1 mark]
(a) uniform
(b) non-uniform
(c) zero
(d) increasing
View Answer & Explanation
Answer: (a) uniform. Equal distances in equal times means constant, or uniform, speed.
Teacher's Note:
1. Most real vehicles have non-uniform speed.
2. Average speed is then used.
Section B: Short Answer Questions
Answer in one to three sentences.
Q7. What is a simple pendulum? [1 mark]
View Answer & Explanation
Answer: A simple pendulum is a small heavy bob hung from a fixed support by a light, inextensible string. When the bob is displaced slightly and released, it swings to and fro.
Teacher's Note:
1. The length is measured from the support to the centre of the bob.
2. A pendulum clock uses this idea.
Q8. Define oscillation, amplitude and time period of a pendulum. [1 mark]
View Answer & Explanation
Answer: One oscillation is a complete to and fro movement of the bob and back to its starting point. Amplitude is the maximum distance of the bob from its mean position, and time period is the time taken for one oscillation.
Teacher's Note:
1. The time period is measured in seconds.
2. Frequency is the number of oscillations per second.
Q9. How can you find the time period of a pendulum accurately? [1 mark]
View Answer & Explanation
Answer: Measure the time for 20 oscillations with a stopwatch and divide by 20. Counting many oscillations reduces the error caused by reaction time.
Teacher's Note:
1. Start counting from the mean position.
2. Repeat and take the average for better accuracy.
Q10. A pendulum completes 20 oscillations in 40 seconds. Find its time period and frequency. [1 mark]
View Answer & Explanation
Answer: Time period = 40 ÷ 20 = 2 s. Frequency = 1 ÷ 2 = 0.5 oscillations per second (0.5 Hz).
Teacher's Note:
1. Frequency is the reciprocal of time period.
2. A pendulum with a 2 s period is called a seconds pendulum.
Q11. A pendulum makes 30 oscillations in 45 seconds. What is its time period? [1 mark]
View Answer & Explanation
Answer: Time period = 45 ÷ 30 = 1.5 s.
Teacher's Note:
1. Divide total time by the number of oscillations.
2. Do not forget the unit.
Q12. What happens to the time period of a simple pendulum if (i) the mass of the bob is increased, (ii) the length is increased, (iii) the amplitude is made a little larger? [1 mark]
View Answer & Explanation
Answer: (i) No change. (ii) The time period increases. (iii) There is no noticeable change for small amplitudes.
Teacher's Note:
1. Galileo noticed that swings of a lamp took the same time.
2. Only length matters for a given place.
Q13. Which of these does not affect the time period of a pendulum: length, mass of bob, material of bob, small amplitude? [1 mark]
View Answer & Explanation
Answer: The mass of the bob, the material of the bob and small amplitude do not affect it. Only the length changes it.
Teacher's Note:
1. This can be tested with bobs of different masses.
2. Keep the length the same in each trial.
Q14. Why is the pendulum used in some clocks? [1 mark]
View Answer & Explanation
Answer: Its time period is constant for a fixed length, so it keeps regular time. Each swing is counted to move the clock hands.
Teacher's Note:
1. The length is adjusted to fix the period.
2. Temperature changes can slightly alter the length.
Section C: Speed and Numerical Problems
Show your working.
Q15. What is speed? State its SI unit. [1 mark]
View Answer & Explanation
Answer: Speed is the distance travelled by a body in one unit of time. Its SI unit is metre per second (m/s).
Teacher's Note:
1. Speed = distance ÷ time.
2. Speed has only magnitude.
Q16. A scooter travels 50 m in 20 s. Find its speed. [1 mark]
View Answer & Explanation
Answer: Speed = 50 ÷ 20 = 2.5 m/s.
Teacher's Note:
1. Use speed = distance ÷ time.
2. Keep the units as m and s.
Q17. Train A covers 120 km in 3 h and train B covers 180 km in 4 h. Which is faster? [1 mark]
View Answer & Explanation
Answer: Speed of A = 120 ÷ 3 = 40 km/h. Speed of B = 180 ÷ 4 = 45 km/h. So train B is faster.
Teacher's Note:
1. Compare speeds, not distances.
2. Both speeds are in the same unit.
Q18. A car moves at 45 km/h for 3 hours. What distance does it travel? [1 mark]
View Answer & Explanation
Answer: Distance = speed × time = 45 × 3 = 135 km.
Teacher's Note:
1. Use distance = speed × time.
2. Check that the time unit matches the speed unit.
Q19. How long will a bus take to cover 150 km at a speed of 30 km/h? [1 mark]
View Answer & Explanation
Answer: Time = distance ÷ speed = 150 ÷ 30 = 5 hours.
Teacher's Note:
1. Time = distance ÷ speed.
2. The answer is in hours since speed is per hour.
Q20. Convert 36 km/h to m/s. [1 mark]
View Answer & Explanation
Answer: 36 km/h = 36 × 1000 m ÷ 3600 s = 36 × 5/18 = 10 m/s.
Teacher's Note:
1. Multiply km/h by 5/18 to get m/s.
2. Multiply m/s by 18/5 to get km/h.
Q21. A cyclist travels 60 km in the first hour and 40 km in the next hour. Find the average speed. [1 mark]
View Answer & Explanation
Answer: Total distance = 60 + 40 = 100 km; total time = 2 h. Average speed = 100 ÷ 2 = 50 km/h.
Teacher's Note:
1. Average speed is total distance divided by total time.
2. It is not the average of the distances.
Q22. A runner covers 400 m in 50 s. What is the speed in m/s and in km/h? [1 mark]
View Answer & Explanation
Answer: Speed = 400 ÷ 50 = 8 m/s. In km/h, 8 × 18/5 = 28.8 km/h.
Teacher's Note:
1. Convert only after finding m/s.
2. 18/5 is 3.6.
Q23. In a distance-time graph, what does a straight line sloping upwards show, and what does a line parallel to the time axis show? [1 mark]
View Answer & Explanation
Answer: A sloping straight line shows motion with uniform speed. A line parallel to the time axis shows the body is at rest, because the distance does not change.
Teacher's Note:
1. A steeper line means higher speed.
2. The graph is drawn with time on the horizontal axis.
Free study material for Science
Download CBSE Practice Material: Class 7 Science Chapter 13 Motion and Time
CBSE Practice Material: Class 7 Science Chapter 13 Motion and Time
Review targeted practice exercises for Class 7 Science Chapter 13 Motion and Time. Curated to match official CBSE guidelines, these downloadable PDF sheets support daily revision and core concept reinforcement.
NCERT-Aligned Questions and Solutions
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FAQs
You can download the teacher-verified PDF for CBSE Class 7 Science Simple Pendulum, Time and Speed Worksheet Set 08 from StudiesToday.com. These practice sheets for Class 7 Science are designed as per the latest CBSE academic session.
Yes, our CBSE Class 7 Science Simple Pendulum, Time and Speed Worksheet Set 08 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 7.
Yes, we have provided detailed solutions for CBSE Class 7 Science Simple Pendulum, Time and Speed Worksheet Set 08 to help Class 7 and follow the official CBSE marking scheme.
Daily practice with these Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 7 students get more marks in CBSE exams.
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