Here we are providing **Class 9 Science Objective** Chapter – 8 Motion because its very important for Class 9 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 9 Science Objective Chapter – 8 Motion is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 9 Science Objective Chapter – 8 Motion 100+ questions so that students practice more and more. If you want class wise Notes Then **Click Here**

## Class 9 Science Objective Chapter – 8 Motion

1.Who gave the equations of motion for the first time?

( A ) Bernhard Nobel

( B ) Issac Newton

( C ) C. V. Raman

( D ) Einstein

**Ans – ( B ) **

2. 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

**Ans – ( A ) **

3. Which of the following can sometimes be ‘zero’ for a moving body?

i. Average velocity

ii. Distance travelled

iii. Average speed

iv. Displacement

( A ) Only (i)

( B ) ( A ) and (ii)

( C ) ( A ) and (iv)

( D ) Only (iv)

**Ans – ( C ) **

4. 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

**Ans – ( D ) **

5. 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.

**Ans – ( A ) **

6.A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is,

( A ) ulg

(
B ) u^{2}l2g

(
C ) u^{2}lg

( D ) ul2g

**Ans – ( B ) **

7. When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then the retardation will be:

(
A ) + 2 m/s^{2}

(
B ) − 2 m/s^{2}

(
C ) − 0.5 m/s^{2}

(
D ) + 0.5 m/s^{2}

**Ans – ( D ) **

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

( A ) multimeter

( B ) ammeter

( C ) speedometer

( D ) accelerator

**Ans – ( C ) **

9. 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 ) **

10. 180° plane angle is equal to

( A ) π/2 radian

( B ) π radian

( C ) 2π radian

( D ) none of these

**Ans – ( B ) **

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

( A ) velocity

( B ) distance

( C ) acceleration

( D ) time

**Ans – ( B ) **

12.The displacement of the object in a unit time is called:

( A ) speed

( B ) velocity

( C ) acceleration

( D ) average speed

**Ans – ( B ) **

13. 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 ) **

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

( A ) Distance

( B ) acceleration

( C ) Speed

( D ) Displacement

Ans – ( C )

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

( A ) velocity

( B ) given speed

( C ) average speed

( D ) instantaneous speed

**Ans – ( D ) **

16.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 ) **

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

( A ) 2.5

( B ) 90000

( C ) 250

( D ) 25

**Ans – ( D ) **

18.The rate of change of velocity per second is known as:

( A ) acceleration

( B ) speed

( C ) average velocity

( D ) linear motion

Ans – ( A )

19. Which of the following is most likely not a case of uniform circular motion?

( A ) Motion of the earth around the sun

( B ) Motion of a toy train on a circular track

( C ) Motion of a racing car on a circular track

( D ) Motion of hours’ hand on the dial of a clock

**Ans – ( C ) **

20.Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms-1 It implies that the boy is

( A ) at rest

( B ) moving with no acceleration

( C ) in accelerated motion

( D ) moving with uniform velocity

**Ans – ( C ) **

21. 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

**Ans – ( D ) **

** **

22.If the velocity of an object changes from an initial value u to the final value v in time t, the acceleration a will be:

( A ) a = v−ut

( B ) a = v+ut

( C ) a = tv−u

( D ) a = tv+u

**Ans – ( A ) **

23. The speed of a moving object is determined to be 0.06 m/s. This speed is equal to :

( A ) 2.16 km/h

( B ) 1.08 km/h

( C ) 0.216 km/h

( D ) 0.0216 km/h

**Ans – ( D ) **

24.Area under a υ -1 graph represents a physical quantity which has the unit

(а)
m^{2}

( B ) m

(
C ) m^{3}

(
D ) ms^{-1}

**Ans – ( B ) **

25. Suppose a boy is enjoying a ride on a marry-go-round which is moving with a constant speed of 10 m/s. It implies that the boy is:

( A ) At rest

( B ) Moving with no acceleration

( C ) In accelerated motion

( D ) Moving with uniform velocity

**Ans – ( C ) **

26.What is the unit of acceleration?

( A ) m/s

(
B ) m/s^{2}

( C ) ms

(
D ) m/s^{3}

**Ans – ( B ) **

27.retardation will be:

( A ) + 2 m/s2

( B ) − 2 m/s2

( C ) − 0.5 m/s2

( D ) + 0.5 m/s2

**Ans – ( D ) **

28.In which of the following cases of motions, the distance moved and the magnitude of displacement are equal?

( A ) If the car is moving on a straight road

( B ) If the car is moving in Circular path

( C ) The pendulum is moving to and fro

( D ) The earth is revolving around the sun.

**Ans – ( A ) **

29.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 ) **

30.The unit of speed and velocity both is:

( A ) ms-1

( B ) ms-2

( C ) ms2

( D ) ms

**Ans – ( A ) **

31. Which is the most simple type of motion among the following?

( A ) Motion in straight line

( B ) Motion in plane.

( C ) Motion in space

( D ) Motion of projectile.

**Ans – ( A ) **

32.A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min. The average velocity of the boy during the whole journey is

( A ) 24 m/min

( B ) 25 m/s

( C ) Zero

( D ) 20 m/min

**Ans – ( A ) **

33. If an object moves 4 km in a straight line then the value of displacement is….

( A ) 4 km

( B ) 8 km

( C ) 12 km

( D ) 0 km

**Ans – ( D ) **

34.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 ) **

35. Speed is depend on…

( A ) Path length

( B ) Displacement

( C ) Initial and final position of the object.

( D ) None of these.

**Ans – ( A ) **

36.A body is projected vertically upward from the ground. Taking vertical upward direction as positive and point of projection as origin, the sign of displacement of the body from the origin when it is at height h during upward and downward journey will be

( A ) Positive, positive

( B ) Positive, negative

( C ) Negative, negative

( D ) Negative, positive

**Ans – ( A ) **

37. Velocity of the particle is depend on….

( A ) Distance

( B ) Displacement

( C ) Path of the object

( D ) None of these

**Ans – ( B ) **

38.A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is:

( A ) u/g

(
B ) u^{2}/2g

(
C ) u^{2}/g

( D ) u/2g

**Ans – ( B ) **

39. In which of the following cases of motions, the distance moved and the magnitude of the displacement are equal?

i. If the car is moving on a straight road

ii. If the car is moving in circular path

iii. The pendulum is moving to and fro

iv. The earth is moving around the sun

( A ) only(ii)

( B ) ( A ) and (iii)

( C ) ( B ) and (iv)

( D ) only (i)

**Ans – ( D ) **

40.The ratio of speed to the magnitude of velocity when the body is moving in one direction is

( A ) Less than one

( B ) Greater than one

( C ) Equal to one

( D ) Greater than or equal to one

**Ans – ( C ) **

41. 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

**Ans – ( B ) **

42.The slope of a velocity-time graph gives:

( A ) the distance

( B ) the displacement

( C ) the acceleration

( D ) the speed

**Ans – ( C ) **

43. 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

**Ans – ( C ) **

44.Which of the following situations is possible?

( A ) An object can have acceleration, but constant velocity.

( B ) The velocity of an object may be zero but acceleration is not zero.

( C ) Distance and the magnitude of displacement are equal in circular motion.

( D ) Average speed and the magnitude of average velocity are always equal in circular motion.

**Ans – ( B ) **

45. 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 ) **

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

( A ) uniform velocity

( B ) uniform acceleration

( C ) increasing acceleration

( D ) decreasing acceleration

**Ans – ( B ) **

47. 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

**Ans – ( C ) **