JEE Questions for Physics Motion In A Straight Line Quiz 13 - MCQExams.com


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  • 3.55
  • 5.03
  • 8.75
  • 10.44

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  • 1 s
  • 2 s
  • 4 s
  • 8 s
A body moves with initial velocity 10 ms–1. If it covers a distance of 20 m is 2s, then acceleration of the body is
  • Zero
  • 10 ms–2
  • 5 ms–2
  • 2 ms–2
A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time
  • 6 s
  • 36 s
  • 38 s
  • None of these
A boat is rent across a river with a velocity of 8 km/hr. If the resultant velocity of boat is 10 km/hr, then velocity of the river is
  • 10 km/hr
  • 8 km/hr
  • 6 km/hr
  • 4 km/hr
A train is moving slowly on a straight track with a constant speed of 2 ms–1. A passenger in that train starts walking at a steady speed of 2 ms–1 to the back of the train in the opposite direction of the motion of the train. So to an observer standing on the platform directly in front of that passenger, the velocity of the passenger appears to be
  • 4 ms–1
  • 2 ms–1
  • 2 ms–1 in the opposite direction of the train
  • Zero
The distance between two particles moving towards each other is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separation increase at the rate of 5 m/sec. The particles have speeds as
  • 5 m/sec; 1 m/sec
  • 4 m/sec; 1 m/sec
  • 4 m/sec; 2 m/sec
  • 5 m/sec; 2 m/sec
A boat moves with a speed of 5 km/hr relative to water in a river flowing with a speed of 3 km/hr and having a width of 1 km.The minimum time taken around a round trip is
  • 5 min
  • 60 min
  • 20 min
  • 30 min
For a body moving the relativistic speed, if the velocity is doubled, then
  • Its linear momentum is doubled
  • Its linear momentum will be less than double
  • Its linear momentum will be more than double
  • Its linear momentum remains unchanged
A river flowing from W to E with a speed of 5 m/min. A man can swim in still water with a velocity 10 m/min. In which direction should the man swim so as to take the shortest possible path to go the south.
  • 30o with downstream
  • 60o with downstream
  • 120o with downstream
  • South
A train is moving towards east and a car is along north, both with same speed. The observed direction of car to the passenger in the train is
  • east–north direction
  • west–north direction
  • south–east direction
  • None of the above
An express train is moving with a velocity v1. Its driver fins another train is moving on the same track in the same direction with velocity v2 . to escape collision, driver applies a retardation a on the train, minimum time of escaping collision will be

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  • 2)
    Physics-Motion in a Straight Line-81984.png
  • None of these
  • Both of these
Two trains are moving with equal speed in opposite direction along two parallel railway tracks. If the wind a blowing with speed u along the track so that the relative velocities of the trains with respect to the wind are in the ratio 1 : 2, then the speed of each train must be
  • 3u
  • 2u
  • 5u
  • 4u
Two cars A and B are moving with same speed of 45 km/hr along same direction. If a third car C coming from the opposite direction with a speed of 36 km/hr meets two cars in an interval of 5 min, the distance of separation of two cars A and B should be (in km)
  • 7.25
  • 6.75
  • 5.55
  • 8.35
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, the speed of A relative to B is
  • u
  • 2u
  • u – gt

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A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three sec. The body has fallen for a time of
  • 3 s
  • 5 s
  • 7 s
  • 9 s
A ball falls from height h. After 1 sec, another ball falls freely from a point from where the first ball falls. Both of them reach the ground at the same time. What is the value of h?
  • 11.2 m
  • 21.2 m
  • 31.2 m
  • 41.2 m

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  • 1
  • 2
  • 10/7
  • 20/7
A ball P is dropped vertically and another ball Q is thrown horizontally with the same velocities from the same height and at the same time. If air resistance is neglected then
  • Ball P reaches the ground first
  • Ball Q reaches the ground first
  • Both reach the ground at the same time
  • The respective masses of the two balls will decide the time
A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about
  • 80 m
  • 40 m
  • 20 m
  • 160 m
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 height is (g = 10 ms–2)
  • 20 m
  • 80 m
  • 170 m
  • 40 m
A frictionless wire AB id fixed on a sphere of radius R. A very small spherical ball slips on this wire. The time taken by this ball to slip from A to B is
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  • 2)
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From a balloon rising vertically upwards at 5 m/s a stone is thrown up at 10 m/s relative to the balloon. Its velocity with respect to ground after 2 s is
  • 0
  • 20 m/s
  • 10 m/s
  • 5 m/s
A stone thrown upward with a speed u fro the top of the tower reaches the ground with a velocity 3u. The height of the tower is

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  • 2)
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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
An object start sliding on a frictionless inclined plane and from same height another object start falling freely
  • Both will reach with same speed
  • Both will reach with same acceleration
  • Both will reach in same time
  • None of the above
From the top of a tower stones, whose masses are in the ratio 1 : 2 are thrown one straight up with an initial speed u and the second straight down with the same speed u. Then, neglecting air resistance
  • The heavier stone hits the ground with a higher speed
  • The higher stone hits the ground with a higher speed
  • Both the stones will have the same when they hit the ground
  • The speed can't be determined with the given data
Three particles A, B and C are thrown from the top of a tower with the same speed. A is thrown up, B is thrown down and C is horizontally. They hit the ground with speeds VA, VB and VC respectively
  • VA = VB = VC
  • VA = VB > VC
  • VA > VB > VC
  • VA > VB = VC
A ball is thrown vertically upwards from the top of a tower at 4.9 ms–1. It strikes the pond near the base of the tower after 3 sec. The height of the tower is
  • 73.5 m
  • 44.1 m
  • 29.4 m
  • None of these
An aeroplane is moving with horizontal velocity u at height h. The velocity of a dropped from it on the earth\'s surface will be (g us acceleration due to gravity)

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