CBSE Class 9 MCQs from ch: motion of physics:there are 20 MCQs,where the quetions with answers are there and this question may be helpful for those students whose exams are going on and also they may acquire good marks by practising this questions.

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

A)uniform velocity
B)moving with no acceleration
C)in accelerated motion
D)moving with uniform velocity

... Answer is d):
(d)moving with uniform velocity

2.A player moves along the boundary of a square ground of side 50 m in 200 sec.The magnitude of displacement of the farmer at the end of 11 minutes 40 seconds from his initial position is

A)50 m
B)150 m
C)200 m
D) 50√2 m

... Answer is d):
(d) 50√2 m

3.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

... Answer is (c):
In accelerated motion

4.The average velocity of a body is given by the expression :

A) V= u+ at
B)2as= v2− u2
C) Vav=(u + v)/2
D) S= ut + ½ a t2

... Answer is c):
(c)Vav=(u+v)/2

5.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)(i) and (ii)
C)(i) and (iv)
D)only (iv)

... Answer is c):
(c)(i) and (iv)

6)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

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

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/s2
B)− 2 m/s2
C)− 0.5 m/s2
D)+ 0.5 m/s2

... Answer is d) :
+ 0.5 m/s2

8. The speed - time graph of a car is given here. Using the data in the graph calculate the total distance covered by the car.

A)1250 m
B)875 m
C)1500 m
D)870 m

... Answer :
(b) 875 m

9.A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be:

A)40 m/s
B)25 m/s
C)10 m/s
D)250 m/s

... Answer :
(c)10 m/s

10.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

... Answer :
(c) Motion of a racing car on a circular track

11.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) (i) and (iii)
C)(ii) and (iv)
D)only (i)

... Answer :
(d) only (i)

12.A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s2. Find how far the car will go before it is brought to rest?

A)8100 m
B)900 m
C)625 m
D)620 m

... Answer :
(c) 625m

13.In a fall the velocity of a stone is increasing equally ion equal intervals of time under the effect of gravitational force of the earth. Then what can you say about the motion of this stone? Whether the stone is having:

A)uniform acceleration
B)non-uniform acceleration
C)retardation
D)constant speed

... Answer is a):
(a)uniform acceleration

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

A)always equal to 1
B)equal to 1 or less than 1
C)always more than 1
D)equal to 1 or more than 1

... Answer is b):
(b) equal to 1 or less than 1

15. Four cars A, B, C and D are moving on a levelled, straight road. Their distance time graphs are shown in the figure below. Which of the following is the correct statement regarding the motion of these cars?

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

... Answer is b):
(b) car B is the slowest

16. A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. Then the displacement covered by the worker in the whole trip is

A)0 km
B)10 km
C)30 km
D)50 km

... Answer is c):
(c) 30 km

17. Rate of change of displacement is called

A)speed
B)deceleration
C)acceleration
D)velocity

... Answer is d):
(d)velocity

18. Acceleration is a vector quantity, which indicates that its value

A)is always negative
B)is always positive
C)is zero
D)can be positive,negative or zero

... Answer is d):
(d)can be positive,negative or zero

19.SI Unit of measurement of acceleration is

A)m/s
B)m/s2
C)m/hr
D)M

... Answer is b):
(b)m/s2

20. An object travels 40m in 5 sec and then another 80m in 5 sec. What is the average speed of the object?

A)12 m/s
B)6 m/s
C)2 m/s
D)0 m/s

... Answer is a):
(a)12 m/s