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Important Questions Chapter 8 Class 7 Science Curiosity NCERT

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Measurement of Time and Motion


Short Questions

1. What is the SI unit of time?

Answer: Second (s).

2.What is a sundial used for?

Answer: Measuring time using the Sun’s shadow.

3.What is the time period of a pendulum?

Answer: Time taken to complete one oscillation.

4.What is speed?

Answer: Distance covered in unit time.

5.What is the SI unit of speed?

Answer: Metre per second (m/s).

6. What is uniform linear motion?

Answer: Motion with constant speed in a straight line.

7. What is a water clock?

Answer: A device that measures time using water flow.

8.Who invented the pendulum clock?

Answer: Christiaan Huygens.

9. What does an odometer measure?

Answer: Distance travelled by a vehicle.

10. What is non-uniform linear motion?

Answer: Motion with changing speed in a straight line.


 Long Questions

1. How did ancient people measure time without clocks?

Answer: They used sundials, water clocks, hourglasses, and candle clocks. These devices tracked time using shadows, water flow, sand, or burning candles.

2. How does a simple pendulum work to measure time?

Answer: A pendulum swings back and forth in a fixed time period. This regular motion helps measure time accurately.

3. What is the difference between uniform and non-uniform motion?

Answer: Uniform motion has constant speed in a straight line. Non-uniform motion has changing speed or direction.

4. How can you calculate the speed of a moving object?

Answer: Divide the total distance covered by the time taken. Speed is measured in units like m/s or km/h.

5. Why is measuring tiny fractions of time important today?

Answer:  It helps in sports to find winners, in medicine to monitor heartbeats, and in technology for fast devices. Accurate time measurement improves many fields like science and space exploration.

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