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NAT I Medical Physics MCQs With Answers

Question # 1

The average power dissipation in a pure capacitor in AC circuit is

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1/2 CV²

CV²

2CV²

Zero

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Question # 2

If the amplitude of sound is doubled and the frequency reduced to one-fourth the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

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Question # 3

A 220 V, 50 Hz, AC 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?

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10 A

5 A

33.3 A

3.33 A

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Question # 4

When a hydrogen atom is bombarded the atom is excited to the n = 4 state of hydrogen atom.The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

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Question # 5

At a certain instant a stationary transverse wave is found to have maximum kinetic energy the appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

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Question # 6

In a voltmeter the conduction takes place due to

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Electrons only

Holes only

Electrons and holes

Electrons and ions

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Question # 7

A train of 150 m length is going towards north direction at a speed of 10 ms^-1 A parrot flies at a speed of 5 ms^-1 towards south direction parallel to the railway track,The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

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Question # 8

The peak voltage in a 200 volt A.C supply is nearly

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220

253

311

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Question # 9

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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√V

V²

1/√V

1/V

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