Class 9 Science - Chapter : Motion 50. MCQs

Class 9 Science – Chapter: Motion 50. MCQs 

1. An object is thrown vertically upwards. Its acceleration at the highest point is:

A) 0 m/s²

B) 9.8 m/s² downward

C) 9.8 m/s² upward

D) Cannot be determined

2. Which of the following remains constant in uniform circular motion?

A) Velocity

B) Acceleration

C) Speed

D) Displacement

3. A car moves with velocity for time and covers distance . Which is correct?

A) 

B) 

C) 

D) 

4. If an object returns to its starting point after a journey, its displacement is:

A) Zero

B) Equal to total distance

C) Infinite

D) None of these

5. The SI unit of displacement is:

A) m/s

B) m/s²

C) metre

D) second

6. Which graph represents an object at rest?

A) Curved s-t graph

B) Straight s-t line parallel to time axis

C) Sloped s-t line

D) None of these

7. A train travels 30 km at 20 km/h and next 70 km at 70 km/h. The average speed is closest to:

A) 40 km/h

B) 50 km/h

C) 60 km/h

D) 70 km/h

8. When velocity and acceleration have opposite signs, the object:

A) Speeds up

B) Slows down

C) Moves at uniform speed

D) Comes to rest immediately

9. Which of the following can be negative?

A) Speed

B) Distance

C) Displacement

D) Time

10. Acceleration is defined as:

A) Rate of change of displacement

B) Rate of change of velocity

C) Product of mass and velocity

D) Rate of change of speed

11. In non-uniform motion:

A) Speed is constant

B) Speed keeps changing

C) Distance is zero

D) Time is variable

12. A car accelerates from 10 m/s to 30 m/s in 5 seconds. Acceleration is:

A) 4 m/s²

B) 5 m/s²

C) 6 m/s²

D) 8 m/s²

13. A graph of velocity-time is a straight line inclined to the time axis. The motion is:

A) Non-uniform acceleration

B) Uniform acceleration

C) Uniform motion

D) Variable speed

14. If a = 0, the velocity-time graph is:

A) Inclined straight line

B) Horizontal straight line

C) Vertical line

D) A parabola

15. If a body is thrown upwards with velocity u, the maximum height reached is:

A) 

B) 

C) 

D) 

16. Which is not a vector quantity?

A) Displacement

B) Acceleration

C) Velocity

D) Distance

17. Displacement-time graph of uniform motion is:

A) Straight line

B) Curve

C) Parabola

D) Zigzag

18. The quantity represented by slope of velocity-time graph is:

A) Velocity

B) Acceleration

C) Displacement

D) Time

19. A body moving with constant speed in a circle has:

A) Zero velocity

B) Constant velocity

C) Constant acceleration

D) Changing velocity

20. A car starts from rest and covers 80 m in 4 s. Its acceleration is:

A) 10 m/s²

B) 5 m/s²

C) 20 m/s²

D) 8 m/s²

21. If velocity is uniform, which is zero?

A) Speed

B) Displacement

C) Acceleration

D) Distance

22. Average velocity for uniformly accelerated motion is:

A) 

B) 

C) 

D) 

23. Which of the following gives displacement directly?

A) Area under speed-time graph

B) Area under v-t graph

C) Slope of s-t graph

D) None of these

24. For an object thrown upward, velocity at the top is:

A) Maximum

B) Zero

C) Same as initial velocity

D) None

25. A stone is dropped from 45 m height. Time to reach ground is:

A) 2 s

B) 3 s

C) 4 s

D) 5 s

26. An object moving with constant acceleration covers 100 m in 5 s. Initial velocity is 0. Find acceleration.

A) 4 m/s²

B) 5 m/s²

C) 6 m/s²

D) 8 m/s²

27. Which graph shows decreasing acceleration?

A) Straight v-t graph

B) Curve bending downwards

C) Horizontal v-t graph

D) None

28. Which is not a characteristic of motion?

A) Mass

B) Speed

C) Displacement

D) Acceleration

29. The displacement of a body is zero. Which of the following is not necessarily true?

A) It has returned

B) It was at rest

C) It changed direction

D) Total distance is not zero

30. Uniform motion means:

A) Equal distances in unequal intervals

B) Unequal distances in equal intervals

C) Equal distances in equal intervals

D) Motion along a circle

31. The term 'retardation' refers to:

A) Negative displacement

B) Negative speed

C) Negative acceleration

D) Negative distance

32. A particle accelerates from rest. What shape will its s-t graph be?

A) Linear

B) Exponential

C) Parabolic

D) Circular

33. Which equation is incorrect for uniformly accelerated motion?

A) 

B) 

C) 

D) 

34. The slope of displacement-time graph is:

A) Displacement

B) Acceleration

C) Velocity

D) Speed

35. Which graph represents zero acceleration?

A) Linear s-t graph

B) Linear v-t graph with zero slope

C) Curved v-t graph

D) Vertical s-t graph

36. Which of the following is not necessary to describe motion?

A) Direction

B) Speed

C) Force

D) Time

37. Which is a correct unit of velocity?

A) m

B) m/s

C) m/s²

D) s/m

38. A vehicle moving at 60 km/h is slowed to stop in 10 s. Its acceleration is:

A) –6 m/s²

B) –1.67 m/s²

C) –2.5 m/s²

D) –4 m/s²

39. In a v-t graph, area under the curve gives:

A) Distance

B) Acceleration

C) Displacement

D) Both A and C

40. An object covers unequal distances in equal intervals. The motion is:

A) Uniform

B) Accelerated

C) Rest

D) Constant

41. Which is true for acceleration-time graph of uniform acceleration?

A) Slope is constant

B) Area gives velocity

C) Slope gives displacement

D) Area gives speed

42. If a body moves with negative acceleration, what happens to velocity?

A) Increases

B) Decreases

C) Constant

D) Becomes zero immediately

43. Which of the following is most suitable to measure short time intervals?

A) Stop watch

B) Wall clock

C) Pendulum

D) Hour glass

44. For circular motion, which is always changing?

A) Speed

B) Velocity

C) Acceleration

D) Both B and C

45. What is the nature of v-t graph for uniformly accelerated motion?

A) Horizontal

B) Vertical

C) Curved

D) Slanted straight line

46. SI unit of acceleration is:

A) m/s

B) m/s²

C) km/h

D) m/h

47. Which physical quantity can never be negative?

A) Displacement

B) Distance

C) Velocity

D) Acceleration

48. If body starts from rest and acceleration is 4 m/s², what is velocity after 3 s?

A) 12 m/s

B) 8 m/s

C) 6 m/s

D) 4 m/s

49. A car goes around a circle with constant speed. What changes?

A) Speed

B) Acceleration

C) Velocity

D) Both B and C

50. Displacement can be greater than distance only when:

A) Object is at rest

B) Never

C) In circular motion

D) None of the above

Answers

1. B.           2. C.           3. C.            4. A.         5. C

6. B.           7. A.           8. B.          9. C.           10. B

11. B.        12. A.        13. B.         14. B.         15. A

16. D.        17. A.        18. B.        19. D.         20. B

21. C.         22. B.         23. B.        24. B.        25. B

26. A.         27. B.         28. A.       29. B.         30. C

31. C.         32. C.         33. D.        34. C.         35. B

36. C.         37. B.         38. B.         39. D         40. B

41. B.         42. B.         43. A.        44. D.         45. D

46. B.         47. B.         48. A.        49. D.         50. B