Question # 1

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

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

R

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

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

If the metal bob is a simple pendulum is replaced by a wooden bob, then its time period will

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Increase

Decreases

Remain the same

First 'A' then 'B'

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

A photoelectric cell converts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

How much water a pump of 2kW can raise in one minute to a height of 10 m. take g = 10 m/s²?

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1000 liters

1200 liters

100 liters

2000 liters

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

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NAT I Computer Science Physics MCQs With Answers

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