JEE Questions for Physics Motion In A Straight Line Quiz 12 - MCQExams.com

A particle moving with a uniform acceleration travels 24 m and 64 m in the first two consecutive intervals of 4 sec each. Its initial velocity
  • 1 m/sec
  • 10 m/sec
  • 5 m/sec
  • 2 m/sec
Two cars A and B are travelling in the same direction with velocities v1 and v2(v1 > v2). When the car A is at a distance d ahead of the car B, the driver of the car A applied the brake producing a uniform retardation a. There will be no collision when

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  • 2)
    Physics-Motion in a Straight Line-81921.png

  • Physics-Motion in a Straight Line-81922.png

  • Physics-Motion in a Straight Line-81923.png
A body of mass 10 kg is moving with a constant velocity of 10 m/s. When a constant force acts for 4 sec on it, it moves with a velocity 2 m/sec in the opposite direction. The acceleration produced in it is
  • 3 m/sec2
  • –3 m/sec2
  • 0.3 m/sec2
  • –0.3 m/sec2

Physics-Motion in a Straight Line-81926.png

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    Physics-Motion in a Straight Line-81928.png

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  • Physics-Motion in a Straight Line-81930.png
An elevator car, whose floor to ceiling distance is equal to 2.7 m, starts ascending with constant acceleration of 1.2 ms–2, 2 sec after the start, a bolt begins falling from the ceiling of the car. The free fall time of the bolt is
  • √0.54 s
  • √6 s
  • 0.7 s
  • 1 s
Speed of two identical cars are u and 4u at a specific instant. The ratio of the respective distances in which the two cars are stopped from that instant is
  • 1 : 1
  • 1 : 4
  • 1 : 8
  • 1 : 16
Two trains travelling on the same track are approaching each other with equal speeds of 40 m/s. The drivers of the trains begin to decelerate simultaneously when they are just 2.0 km apart. Assuming the decelerations to be uniform and equal, the value of the deceleration to barely avoid collision should be
  • 11.8 m/s2
  • 11.0 m/s2
  • 2.1 m/s2
  • –0.8 m/s2
A body moves from rest with a constant acceleration of 5 m/s2.Its instantaneous speed (in m/s) at the end of 10 sec is
  • 50
  • 5
  • 2
  • 0.5
A boggy of uniformly moving train is suddenly detached from train and stops after covering some distance. The distance covered by the boggy and distance covered by the train in the same time has relation
  • Both will be equal
  • First will be half of second
  • First will be 1/4 of second
  • No definite ratio
A body starts from rest. What is the ratio of the distance travelled by the body during the 4th and 3rd second?
  • 7/5
  • 5/7
  • 7/3
  • 3/7
The acceleration \'a\' in m/s2 of a particle is given by a = 3t2 + 2t + 2, where t is the time. If the particle starts out with a velocity u = 2 m/s at t = 0, then the velocity at the end of 2 sec is
  • 12 m/s
  • 18 m/s
  • 27 m/s
  • 36 m/s
For a moving body at any instant of time
  • if the body is not moving, the acceleration is necessarily zero
  • if body is slowing, the retardation is negetive
  • if the body is slowing, the distance is negetive
  • if displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future
What is the relation between displacement, time and acceleration in case of a body having uniform acceleration ?

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    Physics-Motion in a Straight Line-81940.png

  • Physics-Motion in a Straight Line-81941.png
  • None of these
Two cars A and B at same point initially. If A starts with uniform velocity of 40 m/sec and B starts in the same direction with constant acceleration of 4m/s2
  • 10 sec
  • 20 sec
  • 30 sec
  • 35 sec
A body travels for 15 sec starting from rest with constant acceleration. If it travels distances S1, S2 and S3 is

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    Physics-Motion in a Straight Line-81943.png

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  • Physics-Motion in a Straight Line-81945.png
A particle travels 10 m first 5 sec and 10 m in next 3 sec. Assuming constant acceleration, what is the distance travelled in next 2 sec?
  • 8.3 m
  • 9.3 m
  • 10.3 m
  • None of these
The motion of a particle is described by the equation u = at . The distance travelled by the particle in the first 4 sec
  • 4a
  • 12a
  • 6a
  • 8a
The position of a particle moving along the x-axis at certain is given below
which of the following describes the motion correctly?
Physics-Motion in a Straight Line-81949.png
  • Uniform, accelerated
  • Uniform, decelerated
  • Non-uniform, accelerated
  • There is not enough data for generalization
Consider the acceleration, velocity and displacement of a tennis ball it falls to the ground and bounces back. Directions of which of these changes in the process
  • Velocity only
  • Displacement and velocity
  • Acceleration velocity and displacement
  • Displacement and acceleration
A body is moving with uniform acceleration describes 40 m in the first 5 sec and 65 m in next 5 sec. Its initial velocity will be
  • 4 m/s
  • 25 m/s
  • 5.5 m/s
  • 11 m/s
A body of 5 kg is moving with a velocity of 20 m/s. If a force of 100 N is applied on it for 10 s in the same direction as its velocity, what will now be the velocity of the body?
  • 200 m/s
  • 220 m/s
  • 240 m/s
  • 260 m/s
Starting from rest, acceleration of a particle is a = 2(t – 1). The velocity of the particle at t = 5s is
  • 15 m/sec
  • 25 m/sec
  • 5 m/sec
  • None of these
A student is standing at a distance of 50 m from the bus. As soon as the bus begins its motion with an acceleration of 1 ms–2, the student starts running towards the bus with a uniform velocity u. Assuming the motion to be along a straight road, the minimum value of u, so that the student is able to catch the bus is
  • 5 ms–1
  • 8 ms–1
  • 10 ms–1
  • 12 ms–1
A body A moves with a uniform acceleration a and zero initial velocity. Another body B, starts from the same point moves in the same direction with a constant velocity v, The two bodies meet after t. The value of t is

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    Physics-Motion in a Straight Line-81956.png

  • Physics-Motion in a Straight Line-81957.png

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A particle moves along X-axis in such a way that its co-ordinate X varies with time t according to the equation x = (2 – 5t + 6t2) m. The initial velocity of the particle is
  • –5 m/s
  • 6 m/s
  • –3 m/s
  • 3 m/s
A car starts from rest and moves with uniform acceleration a on a straight road from t = 0 to t = T. After that, a constant deceleration brings it to rest. In this process the average speed of the car is

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    Physics-Motion in a Straight Line-81962.png

  • Physics-Motion in a Straight Line-81963.png

  • Physics-Motion in a Straight Line-81964.png
An object accelerates rest to a velocity 27.5 m/s in 10 sec, then find distance covered by object in next 10 sec
  • 550 m
  • 137.5 m
  • 412.5 m
  • 275 m

Physics-Motion in a Straight Line-81967.png
  • Zero
  • 8 m/s2
  • –8 m/s2
  • 4 m/s2
The displacement of a particle is proportional to the cube of time elapsed. How does the acceleration of the particle depends on time obtained?
  • a ∝ t2
  • a ∝ 2t
  • a ∝ t3
  • a ∝ t
A body travelling with uniform acceleration crosses two points A and B with velocities 20 ms–1 and 30 ms–1 respectively. The speed of the body at the mid-point of A and B is nearest to
  • 25.5 ms–1
  • 25 ms–1
  • 24 ms–1
  • 10√6 ms–1
0:0:1


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