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

It is the amount of heat which the surface of earth receives from the sun.
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.

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Physics
Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure is the same as that outside.
normal humidity and partial vacuum are maintained.

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Physics
Why does the sea appear blue in colour?

Interference of the sun light from water surface
Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Refraction of the sun light

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Physics
The mass defect is the result of what action occurring?

Energy being converted into moles of atoms when neutrons break apart protons
Protons and electrons being attracted to each other
Mass being converted to energy when protons and neutrons bind together in a nucleus
Mass being converted to energy when protons and neutrons break apart in a nucleus

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