NCERT MCQ CLASS-9 CHAPTER-8 | MOTION | EDUGROWN

NCERT MCQ ON MOTION

Question 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

Answer: (c) 2r

Question 2.
A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is,
(a) ulg
(b) u²l2g
(c) u²lg
(d) ul2g

Answer: (b) u²l2g

Question 3.
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

Answer: (d) equal or less than 1

Question 4.
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

Answer: (b) uniform acceleration

Question 5.
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

Answer: (a) in uniform motion

Question 6.
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

Answer: (c) in accelerated motion

Question 7.
Area under a υ -1 graph represents a physical quantity which has the unit
(а) m²
(b) m
(c) m³
(d) ms^-1

Answer: (b) m

Question 8.
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.

Answer: (b) Car B is the slowest.

Question 9.
Which of the following figures correctly represents uniform motion of a moving object?
Answer

Answer: (a)

Question 10.
Slope of a velocity-time graph gives
(a) the distance
(b) the displacement
(c) the acceleration
(d) the speed

Answer: (c) the acceleration

Question 11.
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.

Answer: (a) If the car is moving on a straight road

Question 12.
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

Answer: (a) 24 m/min

Question 13.
Velocity-time graph of an object is given below. The object has

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

Answer: (c) Uniform retardation

Question 14.
Which one of the following graphs shows the object to be stationary?

Answer: (b)

Question 15.
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

Answer: (a) Positive, positive

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