Physics
Lightning heats the surrounding air to

300000 deg Cent
30000 deg Cent
300 deg Cent
3000 deg Cent

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient
The entropy of the universe is always increasing
If you conserve energy you will not be as tired

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Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with increase of temperature
Decreases with decrease of temperature
Does not depend on temperature

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Physics
The term ''equinox' means

When the day and night are of equal duration
The path which the Earthtakes around the Sun
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The axis of the Earth around which it rotates

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