Physics
A doppler effect occurs when a source of sound moves

Both A & B
None of these
Towards you
Away from you

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Physics
Thermohaline circulation is mainly due to

Warmer, less dense water sinking in the ocean and cold water replacing it
Winds causing circulation of ocean water
Cold, dense ocean water sinking and warmer water replacing it
Warm water being added to the ocean due to industial waste

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Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.

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