World Geography
The islands with coral covered surfaces in Bay of Bengal are

Nicobar islands
None of these
Andaman islands
both (a) and (b)

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World Geography
The sidereal month may be defined as

None of these
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky
the period in which the moon completes an orbit around the earth
the period of rotation of moon

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