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NAT I Medical Physics MCQs With Answers

Question # 1

The half life of a radio-isotope is 5 years The fraction of atoms decayed in this substance after 15 years will be

Choose an answer

3/4

7/8

5/8

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Question # 2

What will be the ratio of the distance moved by a freely falling body from rest in 4^th and 5^th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

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Question # 3

A piece of fuse wire melts when a current of 15 ampere flows through it.With this current, if it dissipates 22.5 W. the resistance of fuse wire will be

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Zero

10 Ω

1 Ω

0.10 Ω

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Question # 4

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 # 5

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

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Question # 6

The unit of inductance is equivalent to

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V x s/A

V x A/s

A x s/v

V/A x s

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Question # 7

When boron is added as an impurity to silicon the resulting material is

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

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Question # 8

Surface tension of water is due to

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Inter molecular attraction

Intermolecular spaces

Inter molecular repulsion

None of above

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Question # 9

A point charge Q is placed at the mid-point of a line joining two charges 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

-2q

+4q

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