# CBSE 9th Physics Tutorials | Motion-Practice Questions for Examinations

September 22nd, 2015 by Amit Thakur

## Motion-Practice Questions for Examinations

### Match the Columns

##### 20. Match the situation given in column I with the possible curves in column II.
 Column I Column II (a) Particle moving with constant speed (b) Particle moving with increasing acceleration (c) Particle moving with constant negative acceleration (d) Particle moving with zero acceleration

##### 21. Match the items of column I against the items of column II.
 Column I Column II (a) Distance traveled by a uniformly accelerated body after time t. (p)   s = ut (b) Distance traveled by a body moving with a constant velocity (q) (c) Distance covered by a uniformly accelerated body in the nth second of its motion (r) (d) Speed (s) Displacement/Time taken (e) Velocity (t) Distance traveled/Time taken

### Multiple Choice Questions

#### Question 30 In which of the following cases, the object does not possess an acceleration or retardation when it moves in

##### (d) with constant speed along horizontal direction.

1. Square

2. instantaneous

3. velocity

4. displacement

5. South

6. centripetal

7. v/r, axis of ration

8. 12

9. 20 m/sec. south-west

10. may or may not be

11. True

12. False

13. False

14. True

15. False

16. True

17. False

18. True

19. False

20. (a) q, s(b) r (c) p (d) s

21. (a) (r);(b) (p); (c) (q); (t); (e) s

22. (b)                   23. (b)                            24. (b)                        25.b)

26. (b)                   27. (b)                            28 (b)                         29.(c)

30. (d)

# CBSE 9th Physics Tutorials | Motion: Short Answer Type Question with Answers

September 22nd, 2015 by Amit Thakur

Solution.

Solution

Solution.

### Problem 4. A particle starts from rest. Its acceleration (a) versus time (t) is as shown in the figure. What will be the maximum speed of the particle ?

Solution.

The area under acceleration time graph gives change in velocity. As acceleration is zero at the end of 11 sec.

### Problem 5. Can an object maintain its motion in the same direction while reversing the direction of acceleration?

Solution.

Yes, reversing the direction of acceleration will produce retardation. Consequently the velocity

will start decreasing with time but the direction of motion will be maintained till the velocity is

reduced to zero and gets reversed.

### Problem 6. It is the velocity and not the acceleration which decides the direction of motion of a body.” Justify this statement with the help of a suitable example.

Solution.

The direction of velocity is always in the direction of motion of the body, whereas the direction of acceleration may or may hot be is the direction of the motion of the body.

Hence, the velocity decides the direction of motion of the body.