## MCQ Questions for Class 7 Science: Ch 13 Motion and Time 1. If a pendulum is vibrating at 10 Cycles−1, its time period is
(a) 1 sec
(b) 0.1 sec
(c) 0.5 sec
(d) 0.01 sec
► (b) 0.1 sec

2. The rate of change in position of a body is called
(a) Speed
(b) Acceleration
(c) Rest
(d) Motion
► (a) Speed

3. The speed of the vehicle is recorded by
(a) Ammeter
(b) Odometer
(c) Speedometer
(d) Voltmeter
► (c) Speedometer

4. The basic unit of speed is:
(a) km/min
(b) m/min
(c) km/h
(d) m/s
► (d) m/s

4. The meter that is used to measure the distance moved by the vehicle is known as _____​
(a) Speedometer
(b) Odometer
(c) Chronometer
(d) Ammeter
► (b) Odometer

5. Physical quantity which we can't obtain from a distance- time graph is
(a) speed
(b) time taken
(c) change in position
(d) change in weight
► (d) change in weight

6. A velocity-time graph gives (i) the distance (ii) the displacement (iii) the acceleration (iv) the speed
(a) (i) and (ii) only
(b) (ii) and (iii) only
(c) (i) and (iii) only
(d) (i), (ii) and (iii)
► (b) (ii) and (iii) only

7. Time interval of 1000 years is called
(a) A millennium
(b) Trillion
(c) Century
► (a) A millennium

8. To and fro movement of body is termed as
(a) Vibratory motion
(b) Oscillatory motion
(c) Circular and periodic motion.
(d) Periodic motion
► (b) Oscillatory motion

9. Watch used to measure short interval of time is
(a) Stop watch
(b) Pendulum watch
(c) Atom watch
(d) Quartz watch
► (a) Stop watch

10. Distance traveled = ____________ x Time.
(a) Velocity
(b) Momentum
(c) Speed
(d) Displacement
► (c) Speed

11.When a body covers equal distance in equal interval of time. The speed of the body is called as
(a) Average speed
(b) Non-uniform speed
(c) Uniform speed
(d) Linear speed
► (c) Uniform speed

12. Speed time graph is straight line for
(a) Non-uniform motion
(b) Discontinuous motion
(c) Uniform motion
(d) Accelerated motion
► (c) Uniform motion

13. When the motion of the object is not along a fixed path with changing direction
(a) Random motion
(b) Oscillatory motion
(c) Periodic motion
(d) Circular motion
► (a) Random motion

14. Which of the following statement(s) is/are correct?
(a) Symbols of all units are written in singular
(b) Basic unit of speed is km/h
(c) Both the above are correct
(d) None of the above is correct
► (a) Symbols of all units are written in singular

15. It is a part of wall clock and performs oscillatory motion. Its time period is fixed. It is
(a) a pendulum
(b) bob of a pendulum
(c) pendulum clock
(d) None of these
► (a) a pendulum

16. One kilometer is equal to
(a) 100 m
(b) 10 m
(c) 10000 m
(d) 1000 m
► (d) 1000 m

17. A graph is plotted showing the velocity of a car as a function of time. If the graph is a straight line, it means that
(a) the car started at rest
(b) acceleration was constant
(c) acceleration was increasing
(d) velocity was constant
► (d) velocity was constant

18. If the velocity of a body does not change with time, its acceleration is
(a) zero
(b) infinite
(c) unity
(d) None of these
► (a) zero

19. Pendulum of a given length always takes
(a) Equal times in some oscillation
(b) Unequal times in one oscillation
(c) Equal times in one oscillation
(d) Unequal times in some oscillation
► (c) Equal times in one oscillation

20. Odometer is used to measure
(a) Speed of the vehicles
(b) Size of the vehicles
(c) Total distance traveled
(d) Total time taken
► (c) Total distance traveled

21. Total distance covered by a body in unit interval of time in particular direction is called
(a) Speed
(b) Momentum
(c) Velocity
(d) Motion
► (c) Velocity

22. The rate of change of displacement with time is called
(a) Speed
(b) Velocity
(c) Both of these
(d) None of these
► (b) Velocity

23. Speed is scalar quantity but velocity is a
(a) Either scalar or vector
(b) Vector quantity
(c) Neither vector nor scalar
(d) Also scalar quantity
► (b) Vector quantity

24. A car is moving with 72 km/hrs. The speed of the car in m/s is
(a) 30 m/s
(b) 20 m/s
(c) 40 m/s
(d) 25 m/s
► (b) 20 m/s