JEE Questions for Physics Motion In A Straight Line Quiz 2 - MCQExams.com

A body starts from rest with uniform acceleration. If its velocity after n second is v, then its displacement in the last 2 s is

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    Physics-Motion in a Straight Line-81277.png

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A body of mass m thrown horizontally with velocity v from the top of tower of height h, touches the level ground at distance of 250 m from the foot of the tower. A body of mass 2m thrown horizontally with velocity v/2, from the top of tower of height 4 h will touch the level ground at a distance x from then foot of tower. The value of x is
  • 250 m
  • 500 m
  • 125 m

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A ball A is thrown up vertically with a speed u and at the same instant another ball B is released from a height h. At time t, then speed of A relative to B is
  • u
  • 2u
  • u – gt

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  • gt
A bullet fired into a fixed wooden block loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of

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A ball is dropped from a bridge at a height of 176.4 m over a river. After 2s, a second ball is thrown straight downwards. What should be the initial velocity of the second ball so that both hit the water simultaneously?
  • 2.45 ms-1
  • 49 ms-1
  • 25.7 ms-1
  • 24.5 ms-1
Which of the following are correct?
I. A body having constant speed can have varying velocity.
II. Position-time graph for two objects with zero relative velocity are parallel.
III. The numerical ratio of velocity to speed of an object can never be more than one.
  • Only I
  • II and III
  • All of these
  • None of these

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    Physics-Motion in a Straight Line-81293.png

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    Physics-Motion in a Straight Line-81299.png

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The velocity of a body of mass 20 kg decreases from 20 ms-1 to 5 ms-1 in a distance of 100 m. Force on the body is
  • –27.5 N
  • –47.5 N
  • –37.5 N
  • –67.5 N
Displacement (x) of a particle is related to time (t) as x = at + bt2 – ct3 where a, b and c are constants of the motion. The velocity of the particle when its acceleration is zero, is give by

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  • 0.2%
  • 1%
  • 3%
  • 5%
A body thrown vertically up to reach its maximum height in t second. The total time from the time of projection to reach a point at half of its maximum height while returning (in second) is

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    Physics-Motion in a Straight Line-81312.png

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Two cars A and B are moving with same speed of 45 kmh-1 along same direction. If a third car C coming from the opposite direction with a speed of 36 kmh-1 meets two cars in an interval of 5 min, the distance of separation of two cars A and B should be (in km).
  • 6.75
  • 7.25
  • 5.55
  • 8.35
  • 4.75
The distance travelled by an object along a straight line in time t is given by s = 3 – 4t + 5t2 , the initial velocity of the object is
  • 3 units
  • –3 units
  • 4 units
  • –4 units
A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms-1 . Assuming constant acceleration, the approximate time that spends in the barrel after the gun fired is
  • 4 ms
  • 40 ms
  • 400μs
  • 1s

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A body moving with a uniform acceleration crosses a distance of 65 m in the 5th second and 105 m in 9th second. How far will it go in 20 s ?
  • 2040 m
  • 240 m
  • 2400 m
  • 2004 m
Three balls A,B and C are thrown from a height h with equal speed upwards, downwards and horizontally, respectively. What is the relation among speeds VA, VB and VC, with which they hit the ground?
  • VA = VB = VC
  • VA > VC > VB
  • VA = VB > VC
  • VA < VC< VB

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  • Independent of the choice of the two terminals
A body starting from rest moves with uniform acceleration. The distance covered by the body in time t is proportional to

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When a bullet is fired at a target, its velocity decreases by half after penetrating 30 cm into it. The additional thickness it will penetrate before coming to rest is
  • 30 cm
  • 40 cm
  • 10 cm
  • 50 cm
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
  • D < s
  • D > s
  • D = s

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A point initially at rest moves along X-axis. Its acceleration varies with time as a = (6t +m s-2. If it starts from origin, the distance covered in 2 s is
  • 20 m
  • 18 m
  • 16 m
  • 25 m

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  • The component of the electric field normal to the flat surface is constant over the surface
  • The circumference of the flat surface is an equipotential
Two balls are dropped to the ground from different heights. One ball is dropped 2 s after the other but they both strike the ground at the same time. If the first ball takes 5 s to reach the ground, then the difference in initial heights is (take, g= 10 ms-2)
  • 20 m
  • 80 m
  • 170 m
  • 40 m
  • 160 m
A ball is thrown vertically upwards with a velocity of 25 ms-1 from the top of a tower of height 30 m. How long will it travel before it hits ground?
  • 6 s
  • 5 s
  • 4 s
  • 12 s
  • 10 s
A ball which is at rest is dropped from a height h metre. As it bounces off the floor its speed is 80% of what it was just before touching the ground. The ball then rise to nearly a height
  • 0.94 h
  • 0.80 h
  • 0.75 h
  • 0.64 h
Two bodies of different masses are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is

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    Physics-Motion in a Straight Line-81347.png

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An aeroplane is flying horizontally with a velocity of 600 kmh-1 and at a height of 1960 m. When it is vertically above a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
  • 1200 m
  • 0.33 km
  • 333.3 km
  • 3.33 km

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  • A dark spot will be formed at the point P2
  • At P2 the order of the fringe will be maximum
  • The total number of fringes produced between P1 and P2 in the first quadrant is close to 3000
  • The angular separation between two consecutive bright spots decreases as we move from P1 to P2 along the first quadrant
0:0:1


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