# Physics MCQS with Answers Set 2

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In a simple harmonic motion (SHM), which of the following does not hold?
To force on the particle is maximum at the ends
The acceleration in minimum at the mean position
The potential energy is maximum at the mean position
The kinetic energy is maximum at the mean position

A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s2, the height at which the K.E, of the body becomes half its original value is given by:
25 m
10 m
50 m
12.5 m

When n-type of semiconductor is heated
Number of electrons and holes remains same
Number of electrons and holes increases equally
Number of electrons increases while that of holes decreases
Number of holes increases while that of electron decreases

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is
Equal
Greater
Less
Cannot be concluded

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?
10:00 AM
3.33 A
33.3 A
5:00 AM

The conductivity of a superconductor is
Infinite
Very small
Very large
Zero

A particle moves along a circular path under the action of a force. The work done by the force is
Negative and non zero
None of the above
Zero
Positive and non-zero

The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes
4 s
16 s
8 s
12 s

The structure of solids is investigated by using
X-rays