Physics
The period of revolution of a geostationary satellite is

Changing continuously
365 days
24 hours
30 days

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Physics
Which one of the following is not a property of electromagnetic waves?

Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves are transverse waves
Electromagnetic waves do not require a medium to propagate.
Electromagnetic waves do not show interference and diffraction.

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Physics
Hydro-electric power is a:

non-renewable natural resource
A mixture of renewable and non-renewable natural resource
Neither renewable nor non renewable resource
Renewable natural resource

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