JEE Questions for Physics Motion In A Straight Line Quiz 10 - MCQExams.com

Assertion Distance-time graph of the motion of a body having uniformly accelerated motion is a straight line inclined to the time axis.
Reason Distance travelled by a body having uniformly accelerated motion is directly proportional to the square of the time taken.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion A body having non-zero acceleration can have a constant velocity.
Reason Acceleration is the rate of change of velocity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion A body, whatever its motion is always at rest in a frame of reference which is fixed in the body itself.
Reason The relative velocity of a body with respect to itself is zero.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Displacement of a body may be zero when distance travelled by it is not zero.
Reason The displacement is the longest distance between initial and final position.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
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 constant then its motion is known as uniform motion
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion A bus moving due north takes a turn and starts moving towards east with same speed. There will be no change in the velocity of bus.
ReasonVelocity is a vector-quantity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies.
Reason Sometimes relative velocity between two bodies is equal to difference in velocities of the two.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Displacement of a body is vector sum of the area under velocity-time graph.
Reason Displacement is a vector quantity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion Velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to the time axis.
Reason In uniform motion of an object velocity increases as the square of time elapsed.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
Assertion A body may be accelerated even when it is moving uniformly.
Reason When direction of motion of the body is changing then body may have acceleration.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion.
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true.
A projectile is fired vertically upwards with an initial velocity u. After an interval of T seconds a second projectile is fired vertically upwards, also with initial velocity u.

  • Physics-Motion in a Straight Line-81802.png
  • 2)
    Physics-Motion in a Straight Line-81803.png

  • Physics-Motion in a Straight Line-81804.png
  • They never meet
A particle moves along the sides AB, BC, CD of a squareof side 25m with a velocity of 15 ms-1. Its average velocity is
Physics-Motion in a Straight Line-81806.png
  • 15 ms–1
  • 10 ms–1
  • 7.5 ms–1
  • 5 ms–1
A body has speed V, 2V and 3 V in first 1/3 of distance S,seconds 1/3 of S and third 1/3 of S respectively. Its average speed will be
  • V
  • 2V

  • Physics-Motion in a Straight Line-81808.png

  • Physics-Motion in a Straight Line-81809.png
A particle is projected upwards. The times corresponding to height h while ascending and while descending are t1 and t2 respectively. The velocity of projection will be

  • Physics-Motion in a Straight Line-81811.png
  • 2)
    Physics-Motion in a Straight Line-81812.png

  • Physics-Motion in a Straight Line-81813.png

  • Physics-Motion in a Straight Line-81814.png

Physics-Motion in a Straight Line-81816.png

  • Physics-Motion in a Straight Line-81817.png
  • 2)
    Physics-Motion in a Straight Line-81818.png

  • Physics-Motion in a Straight Line-81819.png
  • None of these
A body falls freely from the top of a tower. If covers 36% of the total height in the last second before striking the ground level. The height of the tower is
  • 50 m
  • 75 m
  • 100 m
  • 125 m
If the velocity of a particle is (10 + 2t2) m/s, then theaverage acceleration of the particle between 2s and 5s is
  • 2 m/s2
  • 4 m/s2
  • 12 m/s2
  • 14 m/s2
A bullet moving with a velocity of 200 cm/s penetrates a wooden block and comes to rest after traversing 4 cm inside it. What velocity is needed for travelling distance of 9 cm in same block
  • 100 cm/s
  • 136.2 cm/s
  • 300 cm/s
  • 250 cm/s
A thief is running away on a straight road in jeep moving with a speed of 9 ms–1. A police man chases him on a motor cycle moving at a speed of 10 ms–1. If the instantaneous separation of the jeep from the motorcycle is 100 m, how long will it take for the police to catch the thief.
  • 1 s
  • 19 s
  • 90 s
  • 100 s
A car A is travelling on a straight level road with a uniform speed of 60 km/h. It is followed by another car B which is moving with a speed of 70 km/hr. When the distance between them is 2.5 km, the car B is given a deceleration of 20 km/hr2. After how much time will B catch up with A
  • 1 hr
  • 1/2 hr
  • 1/4 hr
  • 1/8 hr
The speed of a body moving with uniform acceleration is u.This speed is doubled while covering a distance S. When it covers an additional distance S, its speed would become

  • Physics-Motion in a Straight Line-81826.png
  • 2)
    Physics-Motion in a Straight Line-81827.png

  • Physics-Motion in a Straight Line-81828.png

  • Physics-Motion in a Straight Line-81829.png
Two trains one of length 100 m and another of length 125 m, are moving in mutually opposite directions along parallel lines, meet each other, each with speed 10 m/s. If their acceleration are 0.3 m/s2 and 0.2 m/s2 respectively, then the time they take to pass each other will be
  • 5 s
  • 10 s
  • 15 s
  • 20 s
A body starts from rest with uniform acceleration. If its velocity after n second is v, then its displacement in the last two seconds is

  • Physics-Motion in a Straight Line-81832.png
  • 2)
    Physics-Motion in a Straight Line-81833.png

  • Physics-Motion in a Straight Line-81834.png

  • Physics-Motion in a Straight Line-81835.png
A point starts moving in a straight line with a certain acceleration. At a time t after beginning of motion the acceleration suddenly becomes retardation of the same value. The time in which the point returns to the initial point is

  • Physics-Motion in a Straight Line-81837.png
  • 2)
    Physics-Motion in a Straight Line-81838.png

  • Physics-Motion in a Straight Line-81839.png
  • Cannot be predicted unless acceleration is given
A particle is moving in a straight line and passes through a point Owith a velocity of 6 ms–1. The particle moves with a constant retardation of 2 ms–2 for 4 s and there after moves with constant velocity. How long after leaving O does the particle return to O
  • 3 s
  • 8 s
  • Never
  • 4 s
A bird flies for 4 s with a velocity of |t –2| m/s in astraight line, where t is time in seconds. It covers a distance of
  • 2m
  • 4m
  • 6m
  • 8m
A particle is projected with velocity v0 along x–axis.Thedeceleration on the particle is proportional to the square of the distance from the origin i. e., a = –α x2.The distance at which the particle stops is

  • Physics-Motion in a Straight Line-81843.png
  • 2)
    Physics-Motion in a Straight Line-81844.png

  • Physics-Motion in a Straight Line-81845.png

  • Physics-Motion in a Straight Line-81846.png
A body is projected vertically up with a velocity v and after some time it returns to the point from which it was projected. The average velocity and average speed of the body for the total time of flight are

  • Physics-Motion in a Straight Line-81848.png
  • 2)
    Physics-Motion in a Straight Line-81849.png
  • 0 and 0

  • Physics-Motion in a Straight Line-81850.png
A stone is dropped from a height h.Simultaneously, another stone is thrown up from the ground which reaches a height 4 h. The two stones cross each other after time

  • Physics-Motion in a Straight Line-81852.png
  • 2)
    Physics-Motion in a Straight Line-81853.png

  • Physics-Motion in a Straight Line-81854.png

  • Physics-Motion in a Straight Line-81855.png
Four marbles are dropped from the top of a tower one after the other with an interval of one second. The first one reaches the ground after 4 seconds. When the first one reaches the ground the distances between the first and second, the second and third and the third and forth will be respectively.
  • 35, 25 and 15 m
  • 30, 20 and 10 m
  • 20, 10 and 5 m
  • 40, 30 and 20 m
0:0:1


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