Physics
Waves that are required for long distance wireless communication are

Microwaves
Ultraviolet rays
Infrared rays
Radio waves

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Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the sun is between the moon and the earth
the moon is between the sun and the earth

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Physics
Why does the sea appear blue in colour?

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

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