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NAT I Medical Physics MCQs With Answers

Question # 1

Who explained the origin of the Fraunhofer lines?

Choose an answer

Fraunhoffer

Kirchhoff

Fresnel

Snell

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Question # 2

The essential distinction between X-rays and y-rays is that

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y-rays have smaller wavelength than X-rays

y-rays emanate from nucleus while X-rays emanate from outer part of the atom

y-rays have greater ionizing power than X-rays

y-rays are more penetrating than X-rays

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Question # 3

A particle moving in a magnetic field has increase in its velocity then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

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Question # 4

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

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Question # 5

Which of the following particle would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field?

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Proton

Electron

He⁺

Li⁺

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Question # 6

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

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Question # 7

A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is

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Zero

0.5 Ω

1.1 Ω

5.0 Ω

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Question # 8

A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10V then required resistance in series will be

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2000 Ω

4000 Ω

6000 Ω

8000 Ω

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Question # 9

The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

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