A block of weight 4 kg is resting on a smooth horizontal plane. I

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

An astronaut experiences weightlessness in a space satellite. It is because

  • the gravitational force is small at that location in space

  • the gravitational force is large at that location in space

  • the astronaut experiences no gravity

  • the gravitational force is infinitely large at that location in space


2.

The displacement of a particle moving along x-axis with respect to time t is x = at + bt2 − ct3. The dimensions of c are

  • [T-3]

  • [LT-2]

  • [LT-3]

  • [LT3]


3.

A particle moving along a straight line covers half of the distance with a speed of 3 ms-1. The other half of the distance is covered in two equal time intervals with speed of 4.5 ms-1 and 7.5 ms-1. The average speed of the particle (in ms-1) is

  • 5.0

  • 5.5

  • 5.8

  • 4.0


4.

Two cars started moving with initial velocities v and 2 v. For the same deceleration, their respective stopping distances are in the ratio

  • 1 : 1

  • 1 : 2

  • 1 : 4

  • 2 : 1


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5.

The distances traversed during equal intervals of time by a freely falling body from rest are in the ratio

  • 1 : 3 : 5 : 7 ....

  • 2 : 4 : 6 : 8 .....

  • 1 : 4 : 9 : 25 .....

  • 1 : 9 : 25 : 49 .....


6.

In the entire path of a projectile, the quantity that remains unchanged is

  • vertical component of velocity

  • horizontal component of velocity

  • kinetic energy

  • potential energy


7.

The sum of magnitudes of two forces acting at a point is 16 N and their resultant 83 N is at 90° with the force of smaller magnitude. The two forces (in N) are

  • 11, 5

  • 9, 7

  • 2, 14

  • 4, 12


8.

Among the following, the vector quantity is

  • pressure

  • gravitation potential

  • stress

  • impulse


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9.

A block of mass 10 kg is moving horizontally with a speed of 1.5 ms-1 on a smooth plane. If a constant vertical force 10 N acts on it, the displacement of the block from the point of application of the force at the end of 4 s is

  • 5 m

  • 20 m

  • 12 m

  • 10 m


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10.

A block of weight 4 kg is resting on a smooth horizontal plane. If it is struck by a jet of water at the rate of 2 kgs-1 and at the speed of 10 ms-1, then the initial acceleration of the block is

  • 15 ms-2

  • 10 ms-2

  • 5 ms-2

  • 1 ms-2


C.

5 ms-2

F = dmdt × v = 2 × 10

The initial acceleration of block

a = Fm = 2 kgs-1 × 10 ms-24   = 204 = 5 ms-2


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