Class 11 Physics Chapter 3 Motion in a Straight Line Solved Questions and Answers

1 A body is thrown upwards and reaches half of its maximum height. At that position

A its acceleration is constant

B its velocity is zero

C its velocity is maximum

D its acceleration is minimum

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Answer:its acceleration is constant

2 Velocity time curve for a body projected vertically upwards is

A straight line

B ellipse

C parabola

D hyperbola

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Answer:straight line

3 The area under acceleration time graph gives

A change in velocity

B change in acceleration

C distance travelled

D force acting

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Answer:change in velocity

4 The slope of velocity-time graph for motion with uniform velocity is equal to

A zero

B final velocity

C initial velocity

D none of these

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Answer:zero

5 Which of the following is a one dimensional motion ?

A Motion of train running on a straight track

B Motion of satellite

C Motion of air particle

D Motion of snake

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Answer:Motion of train running on a straight track

6 A body is moving along a straight line path with constant velocity. At an instant of time the distance travelled by it is S and its displacement is D, then

A D = S

B D > S

C D < S

D None of these

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Answer:D = S

7 The displacement of a body is zero. The distance covered

A may or may not be zero

B is not zero

C is zero

D depends upon the acceleration

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Answer:may or may not be zero

8 Which of the following can be zero, when a particle is in motion for some time?

A Displacement

B None of these

C Distance

D Speed

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Answer:Displacement

9 The distance travelled by a body is directly proportional to the time taken. Its speed

A remains constant

B decreases

C increases

D becomes zero

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Answer:remains constant

10 The acceleration of a moving body can be found from

A slope of the velocity- time graph

B slope of distance-time graph

C area under distance -time graph

D area under velocity - time graph

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Answer:slope of the velocity- time graph

11 Two trains, each 40 m long are travelling in opposite direction with equal velocity 20 m/s. The time of crossing is

A 1 s

B 2 s

C 3 s

D 4 s

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Answer:1 s

12 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 less than the time of fall

B greater than the time of fall

C twice the time of fall

D equal to the time of fall

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Answer:less than the time of fall

13 The location of a particle has changed. What can we say about the displacement and the distance covered by the particle?

A Neither can be zero

B One may be zero

C Both may be zero

D 1.5 km/h

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Answer:Neither can be zero

14 If distance covered by a particle is zero, what can you say about its displacement?

A It must be zero

B It cannot be zero

C It may or may not be zero

D It is negative

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Answer:It must be zero

15 Acceleration of a particle changes when

A speed changes

B magnitude of velocity changes

C direction of velocity changes

D None of these

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Answer:speed changes

16 What determines the nature of the path followed by the particle?

A Both

B Velocity

C Acceleration

D None of these

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Answer:Both

17 The graph between displacement and time for a particle moving with uniform acceleration is a/an

A parabola

B ellipse

C straight line parallel to time axis

D straight line with a positive slope

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Answer:parabola

18 The numerical ratio of displacement to distance for a moving object is

A equal to or less than 1

B always equal to 1

C always less than 1

D always more than 1

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Answer:equal to or less than 1

19 The ratio of the numerical values of the average velocity and average speed of a body is

A unity or less

B less than unity

C unity

D unity or more

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Answer:unity or less

20 A ball is bouncing elastically with a speed 1 m/s between walls of a railway compartment of size 10 m in a direction perpendicular to walls. The train is moving at a constant velocity of 10 m/s parallel to the direction of motion of the ball. As seen from the ground,

A the direction of motion of the ball changes every 10 seconds.

B speed of ball changes every 10 seconds.

C average speed of ball over any 20 second interval is fixed.

D the acceleration of ball is the same as from the train.

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