JEE Questions for Physics Motion In A Straight Line Quiz 7 - MCQExams.com

Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time ofcrossing is
  • 2s
  • 4s

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A 210 m long train is moving due North at a speed of 25 m/s. A small bird is flying due South a little above the train with speed 5m/s. The time taken by the bird to cross the train is
  • 6s
  • 7s
  • 9s
  • 10s
A police jeep is chasing with velocity of 45 km/hr. a thief in another jeep moving with velocity 153 km/h. Police fires a bullet with muzzle velocity of 180 m/s. The velocity with which it will strike the car of the thief is
  • 150 m/s
  • 27 m/s
  • 450 m/s
  • 250 m/s
A train of 150 m length is going towards north direction at a speed of 10m/sec. A parrot flies at the speed of 5 m/sec towards south direction parallel to the railway track. The time taken by the parrot to cross the train is
  • 12 sec
  • 8 sec
  • 15 sec
  • 10 sec
In figure, one car is at rest and velocity of light from head light is c, then velocity of light from head light for the moving car at velocity v, would be
Physics-Motion in a Straight Line-81641.png
  • c + v
  • c – v
  • c × v
  • c
A boat crosses a river from port A to port B, which are just on the opposite side. The speed of the water is VWand that of boat is VB relative to still water. Assume VB = 2VW . What is the time taken by the boat, if it has tocross the river directly on the AB line

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  • 2)
    Physics-Motion in a Straight Line-81644.png

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  • Physics-Motion in a Straight Line-81646.png
Two bodies are thrown vertically upwards with their initial speed in the ratio 2 : 3. The ratio of the maximum heights reached by them and the ration of their time taken by them to return back to the ground respectively are

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  • 2)
    Physics-Motion in a Straight Line-81649.png

  • Physics-Motion in a Straight Line-81650.png

  • Physics-Motion in a Straight Line-81651.png

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A ball is dropped on the floor from a height of 10m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, the average acceleration during contact is
  • 2100 m/sec2 downwards
  • 2100 m/sec2 upwards
  • 1400 m/sec2
  • 700 m/sec2
Two bodies of different masses ma and mb are dropped from two different heights a and b. The ratio of the time taken by the two to cover these distances are

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  • 2)
    Physics-Motion in a Straight Line-81656.png

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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 seconds. The body has fallen for a time of
  • 3s
  • 5s
  • 7s
  • 9s
A body is thrown vertically upwards. If air resistance is to be taken into account, them the time during which the body rises is
  • Equal to the time of fall
  • Less than the time of fall
  • Greater than the time of fall
  • Twice the time of fall
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 body is released from a great height and falls freely towards the earth. Another body is released from the same height exactly one second later. The separation between the two bodies, two seconds after the releaseof the second body is
  • 4.9 m
  • 9.8 m
  • 19.6 m
  • 24.5 m
An object is projected upwards with a velocity of 100 m/s. It will strike the ground after (approximately)
  • 10 sec
  • 20 sec
  • 15 sec
  • 5 sec
A body is released from the top of a tower of height h. It takes t sec to reach the ground. Where will be the ballafter time t/2 sec
  • At h/2 from the ground
  • At h/4 from the ground
  • Depends upon mass and volume of the body
  • At 3h/4 from the ground
A frictionless wire AB is 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
Physics-Motion in a Straight Line-81666.png

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  • 2)
    Physics-Motion in a Straight Line-81668.png

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A particle is projected up with an initial velocity of 80 ft/sec. The ball will be at a height of 96ft from the ground after
  • 2.0 and 3.0 sec
  • Only at 3.0 sec
  • Only at 2.0 sec
  • After 1 and 2 sec
A body falls from rest, its velocity at the end of first second is (g = 32ft/sec)
  • 16 ft/sec
  • 32 ft/sec
  • 64 ft/sec
  • 24 ft/sec
When a ball is thrown up vertically with velocity V0, it reaches a maximum height of \'h\'. If one wishes to triple the maximum height then the ball should be thrown with velocity

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  • 2)
    Physics-Motion in a Straight Line-81675.png

  • Physics-Motion in a Straight Line-81676.png

  • Physics-Motion in a Straight Line-81677.png
Two spheres of same size, one of mass 2 kg and another of mass 4 kg are dropped simultaneously from the top of Qutub Minar (height = 72 m). When they are 1 mabove the ground, the two spheres have the same
  • Momentum
  • Kinetic energy
  • Potential energy
  • Acceleration
Water drops fall at regular intervals from a top which is 5 m above the ground. The third drop is leaving the tap at the instant the first drop touches the ground. How far above the ground is the second drop at that instant
  • 2.50 m
  • 3.75 m
  • 4.00 m
  • 1.25 m
A body dropped from a height h with an initial speed zero, strikes the ground with a velocity 3 km/hr. Another body of same mass is dropped from the same height h with an initial speed –u\' = 4 km/hr. Find the final velocity of second body with which it strikes theground
  • 3 km/hr
  • 4 km/hr
  • 5 km/hr
  • 12 km/hr
With what velocity a ball be projected vertically so that the distance by it in 5th second is twice the distance it covers in its 6th second (g = 10m/s2)
  • 58.8 m/s
  • 49 m/s
  • 65 m/s
  • 19.6 m/s
A ball is dropped downwards. After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds.
  • 25 m
  • 20 m
  • 50.8 m
  • 9.8 7 m
A stone is thrown with an initial speed of 4.9 m/s from a bridge in vertically upward direction. If falls down in water after 2 sec. The height of the bridge is
  • 4.9 m
  • 9.8 m
  • 19 m
  • 24.7 m
The time taken by a block of wood (initially at rest) to side down a smooth inclined plane 9.8 m long (angle ofinclination is 30°) is
Physics-Motion in a Straight Line-81684.png

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  • 2 sec
  • 4 sec
  • 1 sec
Velocity of a body on reaching the point from which it was projected upwards, is
  • v = 0
  • v = 2u
  • v = 0.5u
  • v = u
A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If g = 10m/sec2, the value of u is
  • 5 m/sec
  • 10 m/sec
  • 15 m/sec
  • 20 m/sec
Time taken by an object falling from rest to cover the height of h1 and h2 is respectivelyt1 and t2 then the ratio of t1 to t2 is

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  • 2)
    Physics-Motion in a Straight Line-81689.png

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A body is thrown vertically up from the ground. It reaches a maximum height of 100 m in 5 sec. After what time it will reach the ground from the maximum height position
  • 1.2 sec
  • 5 sec
  • 10 sec
  • 25 sec
0:0:1


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