Physics
Hydroscope is an instrument that shows changes in:

Sound under water
None of these
Atmospheric humidity
Density of liquid

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Physics
The term ''equinox' means

The path which the Earthtakes around the Sun
When the day and night are of equal duration
The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat
The person can sit on it like a raft
It increases the volume of the person to keep him afloat

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