Physics
The word ''insolation' means

Insoluble matters
Matters which insulate
None of these
Incoming solar radiation

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Physics
Planets are

luminous heavenly bodies that do not twinkle
non-luminous heavenly bodies
luminous heavenly bodies that twinkle
luminous heavenly bodies revolving around a star

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Physics
Why does the sea appear blue in colour?

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

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