Question # 1

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

A monochromatic source of light is placed at a large distance d from a metal surface Photoelectrons are ejected at rate n,kinetic energy being E. If the source is brought nearer to distance d/2, the rate and kinetic energy per photoelectron become nearly

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2n and 2E

4n and 4e

4n and E

N and 4E

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

If two non-zero vector ̅A̅ and ̅B are parallel to each other, then ̅A̅, ̅B is equal to

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Zero

AB

A + B

A - B

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends.

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed.

The part of a transistor which is heavily doped to produce large number of majority carriers is

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Emitter

Base

Collector

Any of the above depending on nature of transistor.

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

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NAT I Medical Physics MCQs With Answers

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