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  1. What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

    2. A.

     Remains constant
    B.

     Becomes zero
    C.

     Increases exponentially
    D.

     None of the above

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  2. The force that keeps a body in a circular motion called

    3. A.

     The centripetal force
    B.

     The centrifugual force
    C.

     The frictional force
    D.

     All the above

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  3. It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

    4. A.

     Weights of buckets are balanced
    B.

     Centre of gravity falls within the body
    C.

     Centre of gravity and centre of equilibrium fall within the feet
    D.

     Resultant weight of buckets is zero

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  4. The working of a rocket is based on the principle of:

    5. A.

     Conservation of momentum
    B.

     Conservation of mass
    C.

     Conservation of energy
    D.

     Conservation of angular momentum

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  5. A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments

    6. A.

     Is zero
    B.

     Depends on the total mass of all the fragments
    C.

     Depends on the speeds of various fragments
    D.

     Is infinity

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  6. A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

    7. A.

     Both the spheres will reach the ground simultaneously.
    B.

     A will reach the ground first.
    C.

     B will reach the ground first.
    D.

     The question is incomplete because the masses of the spheres are not given.

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  7. Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?

    8. A.

     The heavier mass will reach greater height
    B.

     The lighter mass will reach greater height
    C.

     Both will reach the same height
    D.

     Any of them may reach greater height

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  8. The dimension of which of the following is the same as that of impulse ?

    9. A.

     Volume
    B.

     Momentum
    C.

     Torque
    D.

     Change in the rate of momentum

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  9. An object covers distance which is directly proportional to the square of the time. Its accelaration is

    10. A.

     Increasing
    B.

     Decreasing
    C.

     Zero
    D.

     Constant

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  10. A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

    11. A.

     2
    B.

     0.1
    C.

     4
    D.

     0.05

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