Physics - General Knowledge Questions and Answers

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Heat transfer by conduction occurs when molecules

Collide

Combine

Heated

None of the above

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A body absorbs heat most if it is

Black and rough

Black and smooth

White and rough

White and smooth

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A black body can absorb radiations of :

Lower wavelengths only

Intermediate wavelengths only

Higher wavelengths only

All wavelengths

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The cover of a solar cooker is made of glass because

It absorbs sun's rays

It reflects sun's rays

It retains the heat inside by the green house effect

It rediates heat better than metals

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The base of an electric iron is brightly polished mainly

To make it smooth and frictionless

To make it rust-proof

To reduce heat loss by radiation

To make it more durable

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A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The floor and carpet are at different temperatures

The stone conveys the heat away from the feet more rapidly than the carpet

The carpet is a better conductor of heat than the stone

The human body maintains a constant temperature

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Global warming is expected to result in

Increase in level of sea

Change in crop pattern

Change in coast line

All of the above

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Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat

Air layer between two shirts works as good conductor

Air layer between two shirts behaves like insulating media

No radiation of heat takes place

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Sun's heat reaches us by

Conduction

Convection

Radiation

Reflection