# Class 7 Science Chapter 13 Motion and Time | Extra Questions

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.

Same

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?

Second

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 ………………………..

Time

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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