Physics
The working of the quartz crystal in the watch is based on the

Piezo - electric Effect
Johnson Effect
Edison Effect
Photoelectric Effect

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Physics
The term ''equinox' means

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
The axis of the Earth around which it rotates
The path which the Earthtakes around the Sun
When the day and night are of equal duration

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
It produces corrosion
Density of heavy water is higher than that of ordinary water

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