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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)
