CBSE Class 11 Physics Motion in a Straight Line MCQs

Question :  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

Answer :  D = S

Question :  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

Answer :  Neither can be zero

Question :  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

Answer :  may or may not be zero

Question :  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

Answer :  equal to or less than 1

Question :  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

Answer :  Displacement

Question :  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

Answer :  It must be zero

Question :  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

Answer :  Motion of train running on a straight track

Question :  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

Answer :  remains constant

Question :  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

Answer :  zero

Question :  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

Answer :  unity or less 

Question :  What determines the nature of the path followed by the particle?

a) Both

b) Velocity

c) Acceleration

d) None of these

Answer :  Both

Question :  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

Answer :  parabola

Question :  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

Answer :  slope of the velocity- time graph

Question :  Acceleration of a particle changes when

a) speed changes

b) magnitude of velocity changes

c) direction of velocity changes

d) None of these

Answer :  speed changes

Question :  The area under acceleration time graph gives

a) change in velocity

b) change in acceleration

c) distance travelled

d) force acting

Answer :  change in velocity

Question :  If a body travels with constant acceleration, which of the following quantities remains constant ?

a) None of these

b) Time

c) Velocity

d) Displacement

Answer :  None of these

Question :  Velocity time curve for a body projected vertically upwards is

a) straight line

b) ellipse

c) parabola

d) hyperbola

Answer :  straight line

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

Answer :  1s

Question :  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

Answer :  its acceleration is constant

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) 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

Answer :  less than the time of fall