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NAT I Medical Physics MCQs With Answers

Question # 1

Center of mass is a point

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Which is geometric center of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

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Question # 2

If the dot product of two non-zero vectors vanishes the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

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Question # 3

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

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Question # 4

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

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Question # 5

A force of 10N is acting along y-axis its component along x-axis is

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10N

20N

100N

Zero N

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Question # 6

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 # 7

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

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Question # 8

What is the ratio of r.m.s velocity for O₂ to H₂?

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1/4

√4 : 1

1 : √4

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Question # 9

Two bodies of masses m₁ and m₂ have equal momentum their kinetic energies E₁ and E₂ are in the ratio

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√m₁ : √m₂

m₁: m₂

m₂: m₁

m₁² : m₂²

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