Physics - General Knowledge Questions and Answers

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The flow of thermal energy is called

Heat

Current

Voltage

Potential

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On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Metals have higher thermal capacity than plastics

Plastics have a lower density than metals

Metals are good conductors of heat

Plastics have a higher thermal conductivity than metals

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Which of the following is an insulator?

Mercury

Carbon

Germanium

Glass

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'Therm' is the unit of

Power

Heat

Light

Distance

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Heat flows as a result of difference of ________

Temperature

Density

Mass

Volume

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Light beam which is highly directional is called:

Eraser

Grazer

Maser

Laser

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Speed of light is maximum in ________

Vacuum

Solids

Liquids

Gases

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Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

Of variable refractive index

Made up of slabs of different refractive indices

Homogeneous and transparent

Inhomogeneous and transparent

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The speed of light will be minimum while passing through

Water

Vaccum

Air

Glass