MCQ's || Class 09 || Science || Ch. 08 Motion

MCQ Questions for Class 9 Science Chapter 8 Motion with answers

1. What is the unit of distance?

(a) m 

(b) Kg

(c) l

(d) s

Ans. (a)

2. What is the unit of displacement?

(a) m 

(b) Kg

(c) l

(d) s

Ans. (a)

3. Distance is a ........... quantity.

(a) Vector

(b) Scalar

(c) Vector and Scalar both

(d) None

Ans. (b)

4. Displacement is a ........... quantity.

(a) Vector

(b) Scalar

(c) Vector and Scalar both

(d) None

Ans. (a)

5. What is the unit of speed?

(a) ms¹ 

(b) m/s–¹

(c) ms²

(d) m/s

Ans. (d)

6. What is the unit of Velocity?

(a) ms¹ 

(b) m/s–¹

(c) ms²

(d) m/s

Ans. (d)

7. Speed is a ........... quantity.

(a) Vector

(b) Scalar

(c) Vector and Scalar both

(d) None

Ans. (b)

8. Velocity is a ........... quantity.

(a) Vector

(b) Scalar

(c) Vector and Scalar both

(d) None

Ans. (a)

9. Best example of a origin or reference point is

(a) Station

(b) Train standing at station

(c) moving car

(d) passenger

Ans. (a)

10. Example of a vibratory motion is.

(a) tossing a coin

(b) a swing

(c) moving of Earth

(d) None

Ans. (b)

11. A body moves in a uniform circular motion

(a) it is moving with constant velocity.

(b) its acceleration is zero

(c) the body has an acceleration

(d) none of the above

Ans. (c) the body has an acceleration

12. To describe the motion of an object we first specify a

(a) The acceleration of the body

(b) Reference point

(c) The speed

(d) The direction of motion

Ans. (b) Reference point

13. How much we multiply to convert kilometre per hour (km/h) into metre per second (m/s).

(a) 100/18

(b) 1000/360

(c) 1000/60

(d) 5/18

Ans. (d)

14. How much we multiply to convert metre per second (m/s) into kilometre per hour (km/h).

(a) 1000/18

(b) 18/36

(c) 18/5

(d) 5/18

Ans. (c)

15. Speed of 90 km/h when expressed in m/s is

(a) 2.5

(b) 90000

(c) 250

(d) 25

Ans. (d) 25

16. 1 km/ h = ________ m/s

(a) 3/50

(b) 18/5

(c) 50/3

(d) 5/18

Ans. (d) 5/18

17. which is a vector quantity?

(a) Distance

(b) mass

(c) speed

(d) velocity

18. which is not a scalor quantity?

(a) Distance

(b) mass

(c) speed

(d) velocity

19. The slope of the distance-time graph is:

(a) Distance

(b) acceleration

(c) Speed

(d) Displacement

Ans. (c) Speed

20. Which of the quantities – speed, time, velocity and acceleration have the same SI unit?

(a) speed, velocity

(b) Acceleration, time.

(c) velocity, time

(d) velocity, acceleration

Ans. (a) speed, velocity

21. The equations of motion can be derived by using:

(a) Distance – time graph

(b) Velocity – time graph for non-uniform acceleration

(c) Displacement time graph

(d) Velocity – time graph for uniform acceleration

Ans. (d) Velocity – time graph for uniform acceleration

22. What is the average velocity of a car that moved 60 km in 3 hours?

(a) 60 km/h

(b) 20 km/h

(c) 30 km/h

(d) 10 km/h

Ans. (b) 20 km/h

23. Speed of sound in water is 1500 m s^-1, depth of water when reflected sound waves are detected after 0.40 s is

(a) 700 m

(b) 600 km

(c) 600 m

(d) 750 km

Ans. (c) 600 m

1. A particle is moving in a circular path of radius r. The displacement after half a circle would be:

(a) Zero

(b) πr

(c) 2r

(d) 2πr

Ans. (c) 2r

24. A particle is moving in a circular path of radius r. The displacement after completing a round of circle would be:

(a) Zero

(b) πr

(c) 2r

(d) 2πr

Ans. (a) Zero

25. The ______ of a distance versus time graph is speed.

(a) slope

(b) y-intercept

(c) origin

(d) none of the above

Ans. (a) slope

26. The speedometer of a car measures

(a) average speed

(b) instantaneous speed

(c) acceleration

(d) all of the above

Ans. (b) instantaneous speed

27. Odometer of automobiles records

(a) average speed

(b) instantaneous speed

(c) distance travelled

(d) acceleration

Ans. (c) distance travelled

28. The area under the speed-time graph gives the ________.

(a) velocity

(b) distance

(c) acceleration

(d) time

Ans. (b) distance

29. The time taken by a train to slow down from 80 kmh^-1 to 20 kmh^-1 with a uniform deceleration of 2 ms^-2 is

(a) 9 s

(b) 10 s

(c) 8.3 s

(d) 8.4 s

Ans. (c) 8.3 s

30. A car has a uniform acceleration of 6 m/s². In 10s it will cover:​

(a) 300m

(b) 100m

(c) 200m

(d) 350m

Ans. (a) 300m

31. If car A is at 40 km/h and car B is at 10 km/h in the opposite direction, what is the velocity of the car A relative to the car B?

(a) 40 km/h

(b) 50 km/h

(c) 10 km/h

(d) 30 km/h

Ans. (b) 50 km/h

32. If car A is at 40 km/h and car B is at 10 km/h in the same direction, what is the velocity of the car A relative to the car B?

(a) 40 km/h

(b) 50 km/h

(c) 10 km/h

(d) 30 km/h

Ans. (d) 50 km/h

33. Distance covered by a body from velocity-time graph is

(a) Equal to the slope of the graph.

(b) Area under the graph.

(c) Is denoted by a line parallel to the time axis at any point on the distance axis.

(d) Is denoted by a line parallel to the distance axis at any point on the time axis.

Ans. (b) Area under the graph.

34. What is the slope of distance-time graph when object is at rest?

(a) Decreases continuously

(b) Zero

(c) Increases continuously

(d) One

Ans. (b) Zero

35. The ratio of the heights from which two bodies are dropped is 5:9 respectively. The ratio of their final velocities is:​

(a) 9: 25

(b) √ 3: 3

(c) 5 : 3

(d) √5 : √3

Ans. (b) √ 3: 3

36. The ratio of the heights from which two bodies are dropped is 3:5 respectively. The ratio of their final velocities is:​

(a) 9: 25

(b) √ 3: √ 5

(c) 5 : 3

(d) √5 : √3

Ans. (b) √ 3: √ 5

37. A body performs an accelerated motion, with uniform speed. The motion of body is

(a) Linear

(b) Circular

(c) Parabolic

(d) Irregular

Ans. (b) Circular

38. If the velocity of a body is reducing, it is said to have

(a) Negative acceleration

(b) Retardation

(c) Positive acceleration

(d) Both (a) and (b)

Ans. (d) Both (a) and (b)

39. The area under the velocity – time graph gives the

(a) acceleration of the body

(b) displacement of the body

(c) velocity of the body.

(d) distance of the body.

Ans. (b) displacement of the body

40. A body starts from a point A and reaches at B in a straight line and returns back to A. Then there is

(a) positive displacement

(b) negative displacement

(c) zero displacement

(d) none

Ans. (c) zero displacement

41. The speed at any instant of time is known as

(a) velocity

(b) given speed

(c) average speed

(d) instantaneous speed

Ans. (d) instantaneous speed

42. If we get a curve line in displacement-time graph then the velocity is

(a) constant

(b) non-uniform

(c) uniform

(d) decreasing

Ans. (b) non-uniform

43. The numerical ratio of displacement to distance for a moving object is

(a) always less than 1

(b) always equal to 1

(c) always more than 1

(d) equal or less than 1

Ans. (d) equal or less than 1

44. If the displacement of an object is proportional to square of time, then the object moves with

(a) uniform velocity

(b) uniform acceleration

(c) increasing acceleration

(d) decreasing acceleration

Ans. (b) uniform acceleration

45. Fill in the blanks: 

The slope of velocity-time graph gives …………….. and the slope of displacement-time graph gives ……………..

Ans. acceleration, velocity

46. From the given υ – t graph, it can be inferred that the object is

(a) in uniform motion
(b) at rest
(c) in non-uniform motion
(d) moving with uniform acceleration

Ans. (a) in uniform motion

47. Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in the adjacent figure. Choose the correct statement.

(a) Car A is faster than car D.
(b) Car B is the slowest.
(c) Car D is faster than car C.
(d) Car C is the slowest.

Ans. (b) Car B is the slowest.

48. Which of the following figures correctly represents uniform motion of a moving object?

Ans. (a)

49. Velocity-time graph of an object is given below. The object has

(a) Uniform velocity
(b) Uniform speed
(c) Uniform retardation
(d) Variable acceleration

Ans. (c) Uniform retardation

50. Which one of the following graphs shows the object to be stationary?

Ans. (b)

51. According to the given velocity-time graph, the object

(a) is moving with uniform velocity
(b) has some initial velocity
(c) is moving uniformly with some initial velocity
(d) is at rest

Ans. (b) has some initial velocity

52. A car is moving along a straight road with uniform velocity. It is shown in the graph.

Ans. (d)

53. Which of the following graphs is not possible?

Ans. (b)