Physics MCQS with Answers
A person standing near the track of a fast moving train has tendency to fall towards it because of
The high speed of train
Vibration due to motion of train
Some other effect
Gravitation force of attraction between person and trains
How does the Young’s modulus vary with the increase of temperature?
First increases and then decreases
Increases
Remains constant
Decrease
The part of a transistor which is heavily doped to produce large number of majority carriers is
Base
Collector
Emitter
Any of the above depending on nature of transistor
If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be
Unchanged
Decreasing by a factor of 2
Decreasing by a factor of 4
Increasing by a factor of 2
A piece of fuse wire melts when a current of 15 ampere flows through it.
10 ohm
1 ohm
Zero
0.10 ohm
When boron is added as an impurity to silicon, the resulting material is.
p-type conductor
p-type semiconductor
n type semiconductor
n type conductor
Energy is stored in the choke coil in the form of
Electric energy
Magnetic energy
Electro-magnetic energy
Heat
The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an a.c. supply of 20 V, 50 Hz. The secondary will have an output of
200V, 50 Hz
2V, 50 Hz
2V, 5 Hz
200V, 500 Hz
The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is
More than doubled
Double the earlier value
Unchanged
Less than doubled
The direction of induced current is such that it opposes the very cause that has produced it. This is the law of
Lenz
Fleming
Kirchoff
Faraday
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