# MCQs For NCERT Class 11 Physics Chapter 3 Motion in a Straight Line

Solve these Class 11 Physics Chapter 3 MCQ with answers. These Class 11 Physics Chapter 3 MCQ are prepared by our expert teachers on the latest exam pattern of the CBSE Board Exam. We have provided you Class 11 Physics Chapter 3 MCQ Questions with answers to help you to make your preparation.

Please refer to the MCQ Questions for Class 11 Physics Chapter 3 Motion in a Straight Line with Answers. The following Motion in a Straight Line Class 11 Physics MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Physics with Answers for all chapters in your NCERT Class 11 Physics book.

## Class 11 Physics Chapter 3 MCQ Questions Questions with Answers

See below Motion in a Straight Line Class 11 Physics MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. A particle moves from (2,3) m to (4,1) m. The magnitude of displacement is
(a) 2 m
(b) 2√ 3 m
(c) 2 √2 m
(d) 3 √2 m

C

Question. A man leaves his house for a cycle ride. He comes back to his house after half-an-hour after covering a distance of one km. What is his average velocity for the ride ?
(a) zero
(b) 2 km h–1
(c) 10 km s–1
(d) -1/2km s-1

A

Question. What determines the nature of the path followed by the particle?
(a) Speed
(b) Velocity
(c) Acceleration
(d) Both (b) and (c)

D

Question. The graph between displacement and time for a particle moving with uniform acceleration is a/an
(a) straight line with a positive slope
(b) parabola
(c) ellipse
(d) straight line parallel to time axis

B

Question. The acceleration of a moving body can be found from
(a) area under velocity – time graph
(b) area under distance -time graph
(c) slope of the velocity- time graph
(d) slope of distance-time graph

C

Question. Acceleration of a particle changes when
(a) direction of velocity changes
(b) magnitude of velocity changes
(c) speed changes
(d) Both (a) and (b)

C

Question. The area under acceleration time graph gives
(a) distance travelled
(b) change in acceleration
(c) force acting
(d) change in velocity

D

Question. The incorrect statement(s) from the following is/are I. A body having zero velocity will not necessarily
have zero acceleration.
II. A body having zero velocity will necessarily have
zero acceleration.
III. A body having uniform speed can have only
uniform acceleration.
IV. A body having non-uniform velocity will have zero
acceleration.
(a) II, III and IV (b) I and II
(c) II and III (d) IV only

A

Question. If a body travels with constant acceleration, which of the following quantities remains constant ?
(a) Displacement
(b) Velocity
(c) Time
(d) None of these

D

Question. Velocity time curve for a body projected vertically upwards is
(a) parabola
(b) ellipse
(c) hyperbola
(d) straight line

D

Question. A bus starts moving with acceleration 2 m/s2. A cyclist 96 m behind the bus starts simultaneously towards the bus at 20 m/s. After what time will he be able to overtake the bus?
(a) 4 sec
(b) 8 sec
(c) 18 sec
(d) 16 sec

B

Question. Stopping distance of a moving vehicle is directly proportional to
(a) square of the initial velocity
(b) square of the initial acceleration
(c) the initial velocity
(d) the initial acceleration

A

Question. The displacement of a particle is represented by the following equation: S = 3t3 + 7t2 + 5t + 8 where 5 is in meter and t in second. The acceleration of the particle at t = 15 is
(a) 14 m/s2
(b) 18 m/s2
(c) 32 m/s2
(d) zero

C

Question. If a train travelling at 20 m/s is to be brought to rest in a distance of 200 m, then its retardation should be
(a) 1 m/s2
(b) 2 m/s2
(c) 10 m/s2
(d) 20 m/s2

A

Question. Assertion : A body may be accelerated even when it is moving uniformly.
Reason : When direction of motion of the body is changing, the body must have acceleration.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

A

Question. A bullet fired into a wooden block loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of
(a) 22/3 cm
(b) 40/3 cm
(c) 20/3 cm
(d) 22/5 cm

B

Question. A body covers 26, 28, 30, 32 meters in 10th, 11th, 12th and 13th seconds respectively. The body starts
(a) from rest and moves with uniform velocity
(b) from rest and moves with uniform acceleration
(c) with an initial velocity and moves with uniform acceleration
(d) with an initial velocity and moves with uniform velocity

C

Question. The distance time graph of a particle at time t makes angles 45° with the time axis. After one second, it makes angle 60° with the time axis. What is the acceleration of the particle?
(a) √3 -1
(b) √3 +1
(c) √3
(d) 1

A

Question. The distance travelled by a particle starting from rest and moving with an acceleration 4/3ms -2 , in the third second is:
(a) 6 m
(b) 4 m
(c) 10/3 m
(d) 19/3m

C

Question. If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of
(a) 2880 m
(b) 1440 m
(c) 400 m
(d) 20 m

C

Question. The dependence of velocity of a body with time is given by the equation v = 20 +0.1t2. The body is in
(a) uniform retardation
(b) uniform acceleration
(c) non-uniform acceleration
(d) zero acceleration.

C

Question. Assertion : A particle starting from rest and moving with uniform acceleration travels’ a length of x and 3x in first two and next two-seconds.
Reason : Displacement is directly proportional to velocity.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

C

Question. Assertion : The equation of motion can be applied only if acceleration is along the direction of velocity and is constant.
Reason : If the acceleration of a body is zero then its motion is known as uniform motion.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

D

Question. A particle moves along a straight line OX. At a time t (in second) the distance x (in metre) of the particle from O is given by x = 40 + 12t – t3. How long would the particle
travel before coming to rest?
(a) 24 m
(b) 40 m
(c) 56 m
(d) 16 m

C

Question. A particle moves a distance x in time t according to equation x = (t + 5)–1. The acceleration of particle is proportional to
(a) (velocity) 3/2
(b) (distance)2
(c) (distance)–2
(d) (velocity)2/3

A

Question. A bike accelerates from rest at a constant rate 5 m/s2 for some time after which it decelerates at a constant rate 3 m/s2 to come to rest. If the total time elapsed is 8 second, the maximum velocity acquired by the bike is given by
(a) 5 m/s
(b) 10 m/s
(c) 12 m/s
(d) 15 m/s

D

Question. A metro train starts from rest and in 5 s achieves 108 km/h.
After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation. If total distance travelled is 395 m, find total time of travelling.
(a) 12.2 s
(b) 15.3 s
(c) 9 s
(d) 17.2 s

D

Question. A particle starting with certain initial velocity and uniform acceleration covers a distance of 12 m in first 3 seconds and a distance of 30 m in next 3 seconds. The initial velocity of the particle is
(a) 3 ms–1
(b) 2.5 ms–1
(c) 2 ms–1
(d) 1 ms–1

D

Question. Two trains, each 40 m long are travelling in opposite direction with equal velocity 20 m/s. The time of crossing is
(a) 1s
(b) 2s
(c) 3s
(d) Zero

A

Question. The relative velocity VAB or VBA of two bodies A and B may be
I. greater than velocity of body A
II. greater than velocity of body B
III. less than the velocity of body A
IV. less than the velocity of body B
(a) I and II only (b) III and IV only
(c) I, II and III only (d) I, II, III and IV

D

Question. Two cars A and B approach each other at the same speed, then what will be the velocity of A if velocity of B is 8 m/s?
(a) 16 m/s
(b) 8 m/s
(c) – 8 m/s
(d) Can’t be determined.

C

Question. A train of 150 m length is going towards north direction at a speed of 10 ms–1. A parrot flies at a speed of 5 ms–1 towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
(a) 12 s
(b) 8 s
(c) 15 s
(d) 10 s

D

Question. A boat takes 2 hours to travel 8 km and back in still water lake. With water velocity of 4 km h–1, the time taken for going upstream of 8 km and coming back is
(a) 160 minutes
(b) 80 minutes
(c) 100 minutes
(d) 120 minutes

A

Question. A car is moving on a road and rain is falling vertically.
(a) The rain will strike the back screen only
(b) The rain will strike the front screen only
(c) The rain will strike both the screens
(d) The rain will not strike any of the screens

B

Question. If a boat can travel with a speed of v in still water, which of the following trips will take the least amount of time ?
(a) travelling a distance of 2d in still water
(b) travelling a distance of 2d across (perpendicular to) the current in a stream
(c) travelling a distance d downstream and returning a distance d upstream
(d) travelling a distance d upstream and returning a distance d downstream

A

Question. A ship A is moving Westwards with a speed of 10 km h–1 and a ship B 100 km South of A, is moving Northwards with a speed of 10 km h–1. The time after which the distance between them becomes shortest, is
(a) 5 h
(b) 5√2 h
(c) 10 √2 h
(d) 0 h

A

Question. A bus is moving with a velocity of 10 ms–1 on a straight road. A scootorist wishes to overtake the bus in one minute.
If the bus is at a distance of 1.2 km ahead, then the velocity with which he has to chase the bus is
(a) 20 ms–1
(b) 25 ms–1
(c) 60 ms–1
(d) 30 ms–1

D

Question. A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
(a) equal to the time of fall
(b) less than the time of fall
(c) greater than the time of fall
(d) twice the time of fall

B

Question. A body is thrown upwards and reaches half of its maximum height. At that position
(a) its acceleration is minimum
(b) its velocity is maximum
(c) its velocity is zero
(d) its acceleration is constant

D

Question. Velocity-time curve for a body projected vertically upwards is
(a) parabola
(b) ellipse
(c) hyperbola
(d) straight line

D

Question. An object accelerated downward under the influence of force of gravity. The motion of object is said to be
(a) uniform motion
(b) free fall
(c) non uniformly accelerated motion
(d) None of these

1. Dipyaman says: