Physics
The cover of a solar cooker is made of glass because

It rediates heat better than metals
It retains the heat inside by the green house effect
It absorbs sun's rays
It reflects sun's rays

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Physics
Which of the following options correctly explains the term heat budget?

It is the balance between incoming and outgoing radiation
It is the radiation from the earth in the form of long waves.
It is a mode of transfer of heat through matter by molecular activity.
It is the amount of heat which the surface of earth receives from the sun.

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
Weight of the balloon is less than the weight of air displaced by it.
The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in weight

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