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#### Motion One Mark Questions

9th Standard

Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
12 x 1 = 12
1. Slope of the velocity - time graph gives

(a)

speed

(b)

displacement

(c)

distance

(d)

acceleration

2. The area under velocity – time graph represents

(a)

velocity of the moving object

(b)

displacement covered by the moving object

(c)

speed of the moving object

(d)

acceleration of the moving object

3. A car is being driven at a speed of 20 ms-1 when brakes are applied to bring it to rest in 5 s. The decelaration produced in this case will be

(a)

+4 ms-2

(b)

‒4 ms-2

(c)

‒0.25 ms-2

(d)

+0.25 ms-2

4. Unit of acceleration is

(a)

ms-1

(b)

ms-2

(c)

ms

(d)

ms2

5. Which one of the following is most likely not a case of uniform circular motion?

(a)

Motion of the Earth around the Sun

(b)

Motion of a toy train on a circular track

(c)

Motion of a racing car on a circular track.

(d)

Motion of hours hand on the dial of the clock

6. Speed is never ______

(a)

fraction

(b)

negative

(c)

zero

(d)

positive

7. During uniform motion, the change in velocity is _______

(a)

zero

(b)

infinity

(c)

constant

(d)

one

8. If velocity of a body decreases in equal intervals of time is termed ______

(a)

uniform acceleration

(b)

non-uniform acceleration

(c)

negative acceleration

(d)

positive acceleration

9. Negative acceleration is expressed in ______

(a)

m/s

(b)

-m/s

(c)

-m/s2

(d)

m/s2

10. The velocity time graph is parallel to X-axis it shows _______

(a)

uniform velocity of an object

(b)

non-uiniform velocity

(c)

stationary position of an object

(d)

acceleration motion of an object

11. In which direction of the motion of the particles does centripetal force act?

(a)

parallel

(b)

radial

(c)

tangential

(d)

perpendicular

12. In a 50 m race the winner takes 5 s to reach the finishing point. The average speed of the winner is ______

(a)

20 m/s

(b)

25 m/s

(c)

10 m/s

(d)

500 m/s

13. 8 x 1 = 8
14. Speed is a ____________ quantity whereas velocity is a ____________ quantity

()

scalar, vector

15. The slope of the distance – time graph at any point gives __________

()

the constant speed

16. Consider an object is rest at position x = 20m. Then its displacement – time graph will be straight line to _____________ the axis.

()

Parallel to

17. Negative acceleration is called ____________

()

retardation

18. The graph of uniform motion is _____

()

Straight line

19. During uniform motion of an object along a straight line, the change in the velocity is ______

()

Zero

20. The displacement made in one second is _______

()

Speed

21. Give an example of a motion in which the displacement is zero, but the distance travelled is not zero ______

()

Circular motion

22. 5 x 1 = 5
23. For a freely falling body the acceleration 'a' is replaced by s.

(a) True
(b) False
24. An object under uniform circular motion experiences centripetal force

(a) True
(b) False
25. The motion of the object could be uniform or non-uniform depending on its speed.

(a) True
(b) False
26. Giant wheel moves a vertical linear path.

(a) True
(b) False
27. The area under the velocity-time graph is equal to the magnitude of the displacement.

(a) True
(b) False
28. 5 x 1 = 5
29. Motion of a body covering equal distances in equal interval of time

30. (1)

m/s

31. Motion with non uniform acceleration

32. (2)

33. Speed

34. (3)

$\frac { 1 }{ 2 }$gt2

35. Velocity

36. (4)

37. S

38. (5)

m/s