## Class 11 Physics Objective Chapter – 3 Motion in a Straight Line

Here we are providing NCERT Class 11 Physics Objective Chapter – 3 Motion in a Straight Line Chapter Wise MCQs for board exam is very important for board exam preparation. This book explains all the concepts and topics in very simple language that the students can easily understand the complex subjects also. This NCERT Class 11 Physics MCQs Chapter – 3 Motion in a Straight Line Chapter consist all important topic regarding NCERT Class 11 Physics Objective Chapter – 3 Motion in a Straight Line. This book basically covers all the major and minor elements that together form a democratic government. Topics like power-sharing, federalism, democracy and diversity, political parties, consequences of democracy, challenges to democracy etc. have been discussed in the NCERT Class 11 Physics Objective Chapter – 3 Motion in a Straight Line. The question papers in CBSE board exams are generally based on the latest NCERT books. Hence, students must follow the NCERT book to prepare effectively for their Class 11 Physics exam. If you want color notes then click here

Class 11 Physics Objective Chapter – 3 Motion in a Straight Line

1. The distance travelled by an object is directly proportional to the time taken. Its acceleration

( a ) increases

( b ) decreases

( c ) becomes zero

( d ) remains constant

Ans:- (c)

2. A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is

( a ) 3 km/h

( b ) zero

( c ) 2 km/h

( d ) 1.5 km/h

Ans:- (a)

3. If a body travels with constant acceleration, which of the following quantities remains constant ?

( a ) None of these

( b ) Time

( c ) Velocity

( d ) Displacement

Ans:- (a)

4. The dimensional formula for velocity is

( a ) [LT]

( b ) [LT-1]

( c ) [L2T]

( d ) [L-1T]

Ans:- (b)

5. 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

Ans:- (a)

6. A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is

( a ) 3 km/h

( b ) zero

( c ) 1.5 km/h

( d ) 2 km/h

Ans:- (b)

7.  Which one of the following is the unit of velocity?

( a ) kilogram

( b ) metre

( c ) m/s

( d ) second

Ans:- (c)

8. The dimensional formula for speed is

( a ) T-1

( b ) LT-1

( c ) L-1T-1

( d ) L-1T

Ans:- (b)

9. Velocity time curve for a body projected vertically upwards is

( a ) straight line

( b ) ellipse

( c ) parabola

( d ) hyperbola

Ans:- (a)

10. A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is

( a ) 10 s

( b ) 12 s

( c ) 9 s

( d ) 6 s

Ans:- (d)

11. A body starts from rest and travels with uniform acceleration on a straight line. If its velocity after making a displacement of 32 m is 8 m/s, its acceleration is

( a ) 1 m/s²

( b ) 2 m/s²

( c ) 3 m/s²

( d ) 4 m/s²

Ans:- (a)

12. 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

Ans:- (a)

13. A body starts from rest and travels with uniform acceleration of 2 m/s². If its velocity is v after making a displacement of 9 m, then v is

( a ) 8 m/s

( b ) 6 m/s

( c ) 10 m/s

( d ) 4 m/s

Ans:- (b)

14. boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A If he takes one hour to do so, his average velocity is

( a ) 3 km/h

( b ) zero

( c ) 1.5 km/h

( d ) 2 km/h

Ans:- (a)

15. A body starts from rest and travels for five seconds to make a displacement of 25 m if it has travelled the distance with uniform acceleration a then a is

( a ) 3 m/s²

( b ) 4 m/s²

( c ) 2 m/s²

( d ) 1 m/s²

Ans:- (c)

16. A boy moves on a circular distance of radius R. Starting from a point A he moves to a point B which is on the other end of the diameter AB. The ratio of the distance travelled to the displacement made by him is

( a ) p/2

( b ) p

( c ) 2p

( d ) 4p

Ans:- (a)

17. A body starts from rest. If it travels with an acceleration of 2 m/s², its displacement at the end of 3 seconds is

( a ) 9 m

( b ) 12 m

( c ) 16 m

( d ) 10 m

Ans:- (a)

18. A particle is moving with a constant speed along straight line path. A force is not required to

( a ) change its direction

( b ) increase its speed

( c ) decrease its momentum

( d ) keep it moving with uniform velocity

Ans:- (d)

19. The dimensional formula for acceleration is

( a ) [LT2]

( b ) [LT/2]

( c ) [L2T]

( d ) [L2T2]

Ans:- (b)

20. 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

Ans:- (a)

21. The displacement-time graph of a moving object is a straight line. Then,

( a ) its acceleration may be uniform

( b ) its velocity may be uniform

( c ) its acceleration may be variable

( d ) both its velocity and acceleration may be uniform

Ans:- (b)

22. Which one of the following is the unit of velocity?

( a ) kilogram

( b ) metre

( c ) m/s

( d ) second

Ans:- (c)

23. 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

Ans:- (a)

24. Which one of the following is the unit of acceleration?

( a ) m/s

( b ) m/s²

( c ) km/hr

( d ) cm/s

Ans:- (b)

25. 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 ) One is +ve, other is –ve

Ans:- (a)

26. The mass of an object is quantitative measure 0 its

( a ) Momentum

( b ) Acceleration

( c ) Inertia

( d ) Energy

Ans:-(c)

27.  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

Ans:- (a)

28. A body starts from rest and travels with uniform acceleration a to make a displacement of 6 m. If its velocity after making the displacement is 6 m/s, then its uniform acceleration a is

( a ) 6 m/s²

( b ) 2 m/s²

( c ) 3 m/s²

( d ) 4 m/s²

Ans:- (c)

29. If the displacement of an object is zero, then what can we say about its distance covered?

( a ) It is negative

( b ) It is must be zero

( c ) It cannot be zero

( d ) It may or may not be zero

Ans:- (d)

30. 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

Ans:- (a)

31. 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

Ans:- (a)

32. The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

( a ) 1 s

( b ) 2 s

( c ) 3 s

( d ) 4 s

Ans-: (b)

33. The area under acceleration time graph gives

( a ) change in velocity

( b ) change in acceleration

( c ) distance travelled

( d ) force acting

Ans-: (a)

34. 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

Ans-: (a)

35. A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s . Then t is

( a ) 10 s

( b ) 5 s

( c ) 20 s

( d ) 6 s

Ans-: (b)

36.  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

Ans-: (a)

37. When a body is dropped from a tower, then there is an increase in its

( a ) mass

( b ) velocity

( c ) acceleration

( d ) potential energy

Ans-: (b)

38. 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

Ans-: (a)

39.The action and reaction never act on

( a ) Same body

( b ) Two bodies

( c ) many bodies

( d ) All of these

Ans-: (a)

40. If the displacement-time graph of an object is parallel to the time-axis, then it represents that the object is :

( a ) at rest

( b ) in uniform motion

( c ) in acceleration motion

( d ) none of the above

Ans-: (a)

41. The acceleration of a moving object can be found from

( a ) area under displacement-time graph

( b ) slope of displacement-time graph

( c ) area under velocity-time graph

( d ) slope of velocity-time graph

Ans-: (d)

42. A body starts from rest. If it travels with an acceleration of 2 m/s², its displacement at the end of 3 seconds is

( a ) 9 m

( b ) 12 m

( c ) 16 m

( d ) 10 m

Ans-: (a)

43. Horizontal range is maximum when the angle of projectile is.

( a ) 0 o

( b ) 30 o

( c ) 45 o

( d ) 60 o

Ans-: (c)

44. 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

Ans-: (a)

45. Kg ms-1 can also be written as

( a ) Nm

( b ) Ns

( c ) Ns-1

( d ) Js

Ans-: (b)

46.  A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s. Then t is

( a ) 10 s

( b ) 5 s

( c ) 20 s

( d ) 6 s

Ans-: (b)

47. A collision in which K.E. of the system is not conserved is

( a ) Elastic collision

( b ) B. Inelastic collision

( c ) 3rd low of motion

( d ) None of these

Ans-: (c)

48. The motion and rest are

( a ) Absolute

( b ) Relative

( c ) Mutual

( d ) All of these

Ans-: (b)

49. The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

( a ) 1 s

( b ) 2 s

( c ) 3 s

( d ) 4 s

Ans:- (b)

50. For maximum range the angle of projection must be

( a ) 30o

( b ) 45o

( c ) 60o

( d ) 90o

Ans:-(b)