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PHY101 Quiz 2 Solved

1) The speed of a wave depends upon (i.e., is casually affected by)

1. The frequency of the wave
2. The properties of the medium through which the wave travels
3. The wavelength of the above
4. Both the wavelength and the frequency of the above

2) The rate of change of momentum of a body is equal to:

1. Applied force
2. Acceleration
3. Velocity
4. Displacement

3) Ali wants to lift a mass of 7.5 kg with constant velocity of a rope that passes through a frictionless pulley which is attached to the celling of room. Calculate the tension in the rope by neglecting the mass of the rope

1. 75 kg
2. 5 kg
3. 75 N
4. 75 N

4) The law of conservation of momentum applies to a system of colliding objects only if:

1. the coefficient of restitution is one
2. the coefficient of restitution is zero
3. the net external impulse is zero
4. there is no change in kinetic energy of the system

5) If the mass of moving objects is doubled then its K.E becomes

1. 2 times
2. 16 times
3. 4 times
4. 5 times

6) An object attached to one end of a spring makes 20 complete oscillations in 10s. Its period is:

1. 2 s
2. 5Hz
3. 5 s
4. 2Hz

7) The center of gravity coincides with the center of mass

1. If the acceleration due to gravity is uniform over the body
2. Never
3. Always
4. If the center of mass is at the geometrical center of the body

8) Which one is vector quantity

1. Length
2. Work
3. Volume
4. Velocity

9) When number of bodies are such that they can exert force upon one another and no external agency exerts a force of them, they are said to form.

1. Non isolated system
2. An inertial frame of reference
3. Non-inertial frame of reference
4. An isolated system

10) A sphere of momentum on inertia I rolls down an inclined plane without slipping. The ratio of the rotational kinetic energy to the transitional kinetic energy is nearly:

1. 5/7
2. 7/5
3. 2/5
4. 5/2

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