## MCQ Questions for Class 9 Science: Ch 8 Motion

1. Which of the following statement is correct regarding velocity and speed of a moving body?

(a) Velocity of a moving body is always higher than its speed

(b) Speed of a moving body is always higher than its velocity

(c) Speed of a moving body is its velocity in a given direction

(d) Velocity of a moving body is its speed in a given direction

► (d) Velocity of a moving body is its speed in a given direction

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

(a) Distance

(b) acceleration

(c) Speed

(d) Displacement

► (c) Speed

3. For a body performing motion with uniform speed, the distance-time graph is:

(a) Straight line parallel to y-axis

(b) Straight line inclined to the time axis

(c) Straight line parallel to x-axis

(d) Curved line

► (b) Straight line inclined to the time axis

4. Which of the following is a correct measure of velocity?

(a) 30 s

(b) 30 m/s

(c) 30 South

(d) 30 m/s, South

► (d) 30 m/s, South

5. An object travels 20 m in 5 sec and then another 40 m in 5 sec. What is the average speed of the object?

(a) 6 m/s

(b) 2 m/s

(c) 12 m/s

(d) 0 m/s

► (a) 6 m/s

6. 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 these

► (c) the body has an acceleration

7. The S.I. unit of acceleration is:

(a) ms

^{-2}
(b) ms

(c) ms

^{2}
(d) m

► (c) ms

^{2}
8. 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

► (b) 20 km/h

(a) 60 km/h

(b) 20 km/h

(c) 30 km/h

(d) 10 km/h

► (b) 20 km/h

9. Which of the following situations are not possible?

(a) A body moving with constant acceleration but with zero velocity.

(b) A body moving horizontally with an acceleration in vertical direction

(c) A body moving with a constant velocity in an accelerated motion

(d) All of these

► (c) A body moving with a constant velocity in an accelerated motion

10. A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?

(a) During downward motion

(b) When the ball comes to rest

(c) During upward motion

(d) When the boy catches the ball

► (a) During downward motion

11. Choose the correct option:

(a) distance is a scalar, velocity is a vector , acceleration is a vector.

(b) distance is a vector, velocity is a scalar, acceleration is a vector.

(c) distance is a vector, velocity is a vector, acceleration is a vector.

(d) distance is a scalar, velocity is a vector, acceleration is a scalar.

► (a) distance is a scalar, velocity is a vector , acceleration is a vector.

12. Name the instrument used to measure instantaneous speed of a vehicle

(a) multimeter

(b) ammeter

(c) speedometer

(d) accelerator

► (c) speedometer

13. 180° plane angle is equal to

(a) Ï€/2 radian

(b) Ï€ radian

(c) 2Ï€ radian

(d) none of these

► (b) Ï€ radian

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

(a) velocity

(b) distance

(c) acceleration

(d) time

► (b) distance

15. 1 km/ h = ________ m/s

(a) 3/50

(b) 18/5

(c) 50/3

(d) 5/18

► (d) 5/18

16. 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

► (b) √ 3: √ 5

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

(a) velocity

(b) given speed

(c) average speed

(d) instantaneous speed

► (d) instantaneous speed

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

(a) 300m

(b) 100m

(c) 200m

(d) 350m

► (a) 300m

19. A body starts to slide over a horizontal surface with an initial velocity of 0.2 m/s. Due to friction, its velocity decreases at the rate of 0.02 m/s

^{2}. How much time will it take for the body to stop?
(a) 10s

(b) 15s

(c) 1s

(d) 5s

► (a) 10s

20. 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

► (d) Velocity – time graph for uniform acceleration

(a) Distance – time graph

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

(c) Displacement time graph

(d) Velocity – time graph for uniform acceleration

► (d) Velocity – time graph for uniform acceleration

21. A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s

^{2}, the total distance covered before he stops is:
(a) 19 m

(b) 17 m

(c) 16 m

(d) 18 m

► (a) 19 m

► (a) 19 m

22. Speed of a body in particular direction can be called

(a) acceleration

(b) displacement

(c) velocity

(d) distance

► (c) velocity

23. The ratio of C.G.S. to M.K.S. unit of acceleration is:

(a) 1:10

(b) 1:1

(c) 1:100

(d) 10:1

► (c) 1:100

29. 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.

► (b) Area under the graph .

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

(a) Linear

(b) Circular

(c) Parabolic

(d) Irregular

► (b) Circular

31. The slope of distance – time graph gives instantaneous.

(a) acceleration

(b) speed

(c) velocity

(d) Distance covered

► (b) speed

32. ______________ describes how fast something is going, whereas, __________ describes how fast something is going in a certain direction.

(a) rate, velocity

(b) rate, speed

(c) speed, velocity

(d) speed, acceleration

► (c) speed, velocity

33. If a moving body comes to rest, then its acceleration is-

(a) positive

(b) both of these depending upon the initial velocity

(c) negative

(d) zero

► (c) negative

34. 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

► (b) 50 km/h

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

(a) 2.5

(b) 90000

(c) 250

(d) 25

► (d) 25

36. MCQ Questions for Class 9 Science: Ch 8 Motion

1. Which of the following statement is correct regarding velocity and speed of a moving body?

(a) Velocity of a moving body is always higher than its speed

(b) Speed of a moving body is always higher than its velocity

(c) Speed of a moving body is its velocity in a given direction

(d) Velocity of a moving body is its speed in a given direction

► (d) Velocity of a moving body is its speed in a given direction

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

(a) Distance

(b) acceleration

(c) Speed

(d) Displacement

► (c) Speed

3. For a body performing motion with uniform speed, the distance-time graph is:

(a) Straight line parallel to y-axis

(b) Straight line inclined to the time axis

(c) Straight line parallel to x-axis

(d) Curved line

► (b) Straight line inclined to the time axis

4. Which of the following is a correct measure of velocity?

(a) 30 s

(b) 30 m/s

(c) 30 South

(d) 30 m/s, South

► (d) 30 m/s, South

5. An object travels 20 m in 5 sec and then another 40 m in 5 sec. What is the average speed of the object?

(a) 6 m/s

(b) 2 m/s

(c) 12 m/s

(d) 0 m/s

► (a) 6 m/s

6. 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 these

► (c) the body has an acceleration

7. The S.I. unit of acceleration is:

(a) ms-2

(b) ms

(c) ms2

(d) m

► (c) ms2

8. 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

► (b) 20 km/h

9. Which of the following situations are not possible?

(a) A body moving with constant acceleration but with zero velocity.

(b) A body moving horizontally with an acceleration in vertical direction

(c) A body moving with a constant velocity in an accelerated motion

(d) All of these

► (c) A body moving with a constant velocity in an accelerated motion

10. A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?

(a) During downward motion

(b) When the ball comes to rest

(c) During upward motion

(d) When the boy catches the ball

► (a) During downward motion

11. Choose the correct option:

(a) distance is a scalar, velocity is a vector , acceleration is a vector.

(b) distance is a vector, velocity is a scalar, acceleration is a vector.

(c) distance is a vector, velocity is a vector, acceleration is a vector.

(d) distance is a scalar, velocity is a vector, acceleration is a scalar.

► (a) distance is a scalar, velocity is a vector , acceleration is a vector.

12. Name the instrument used to measure instantaneous speed of a vehicle

(a) multimeter

(b) ammeter

(c) speedometer

(d) accelerator

► (c) speedometer

13. 180° plane angle is equal to

(a) Ï€/2 radian

(b) Ï€ radian

(c) 2Ï€ radian

(d) none of these

► (b) Ï€ radian

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

(a) velocity

(b) distance

(c) acceleration

(d) time

► (b) distance

15. 1 km/ h = ________ m/s

(a) 3/50

(b) 18/5

(c) 50/3

(d) 5/18

► (d) 5/18

16. 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

► (b) √ 3: √ 5

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

(a) velocity

(b) given speed

(c) average speed

(d) instantaneous speed

► (d) instantaneous speed

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

(a) 300m

(b) 100m

(c) 200m

(d) 350m

► (a) 300m

19. A body starts to slide over a horizontal surface with an initial velocity of 0.2 m/s. Due to friction, its velocity decreases at the rate of 0.02 m/s2. How much time will it take for the body to stop?

(a) 10s

(b) 15s

(c) 1s

(d) 5s

► (a) 10s

20. 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

► (d) Velocity – time graph for uniform acceleration

21. A man is moving with 36 kmph. The time of reaction is 0.9 seconds. On seeing an obstacle in the path, he applies brakes and decelerates at 5 m/s2, the total distance covered before he stops is:

(a) 19 m

(b) 17 m

(c) 16 m

(d) 18 m

► (a) 19 m

22. Speed of a body in particular direction can be called

(a) acceleration

(b) displacement

(c) velocity

(d) distance

► (c) velocity

23. The ratio of C.G.S. to M.K.S. unit of acceleration is:

(a) 1:10

(b) 1:1

(c) 1:100

(d) 10:1

► (c) 1:100

29. 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.

► (b) Area under the graph .

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

(a) Linear

(b) Circular

(c) Parabolic

(d) Irregular

► (b) Circular

31. The slope of distance – time graph gives instantaneous.

(a) acceleration

(b) speed

(c) velocity

(d) Distance covered

► (b) speed

32. ______________ describes how fast something is going, whereas, __________ describes how fast something is going in a certain direction.

(a) rate, velocity

(b) rate, speed

(c) speed, velocity

(d) speed, acceleration

► (c) speed, velocity

33. If a moving body comes to rest, then its acceleration is-

(a) positive

(b) both of these depending upon the initial velocity

(c) negative

(d) zero

► (c) negative

34. 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

► (b) 50 km/h

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

(a) 2.5

(b) 90000

(c) 250

(d) 25

► (d) 25

36. A body is moving with a velocity of 10m/s. If the motion is uniform, what will be the velocity after 10 second?

(a) 15m/s.

(b) 5m/s

(c) 10m/s

(d) 20m/s

► (c) 10m/s

37. A body is said to be in rest when

(a) its position doesn’t change with time with respect to the observer.

(b) body moves in uniform motion w.r.t observer

(c) its position changes with time w.r.t observer.

(d) none of these

► (a) its position doesn’t change with time with respect to the observer.

38. If you whirl a stone on the end of the string and the string suddenly breaks, the stone will:

(a) Fly off along the tangent to its circular path.

(b) Fly directly towards you.

(c) Spiral away from your hand.

(d) Spiral in towards your hand.

► (a) Fly off along the tangent to its circular path.