#### Motion Important Questions

9th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. Slope of the velocity - time graph gives

(a)

speed

(b)

displacement

(c)

distance

(d)

acceleration

2. Unit of acceleration is

(a)

ms-1

(b)

ms-2

(c)

ms

(d)

ms2

3. The force responsible for drying of clothes in a washing machine is

(a)

Centripetal force

(b)

Centrifugal force

(c)

Gravitational force

(d)

Electro static force

4. In a 100 m race, the winner takes 10s to reach the finishing point. The average speed of the winner is ___________ ms-1

(a)

5

(b)

10

(c)

20

(d)

40

5. Speed is never ______

(a)

fraction

(b)

negative

(c)

zero

(d)

positive

6. 5 x 1 = 5
7. Speed is a ____________ quantity whereas velocity is a ____________ quantity

()

scalar, vector

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

()

Parallel to

9. Area under velocity ‒ time graph shows ____________

()

distance travelled by an object

10. The graph of uniform motion is _____

()

Straight line

11. Acceleration is a _____ quantity.

()

Vector

12. 5 x 1 = 5
13. The motion of a city bus in a heavy traffic road is an example for uniform motion

(a) True
(b) False
14. Distance covered by a particle never becomes zero between any interval of time but displacement becomes zero

(a) True
(b) False
15. If the velocity – time graph of a particle is a straight line inclined to time axis then its displacement – time graph will be a straight line?

(a) True
(b) False
16. For a freely falling body the acceleration 'a' is replaced by s.

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

(a) True
(b) False
18. 5 x 1 = 5
19. Motion of a body covering equal distances in equal interval of time

20. (1)

m/s

21. Constant retardation

22. (2)

m

23. Uniform acceleration

24. (3)

25. Speed

26. (4)

27. Distance

28. (5)

4 x 2 = 8
29. Define distance.

30. What is speed?

31. What is acceleration?

32. A student takes 15 minutes to travel from his home to school with a uniform speed of 5km/h. What is the distance of his school form the home?

33. 4 x 3 = 12
34. An object travels 16m in 4s and then another 16m in 2 s. What is the average speed of the object?

35. Define velocity?

36. Distinguish distance and displacement.

37. What is meant by negative acceleration?

38. 2 x 5 = 10
39. Derive equations of motion by graphical method.

40. A racing car has a uniform acceleration of 4 ms-2. What distance it covers in 10 s after start?