Jet engine and rocket flying are based on which rule?

The reason for permanent hardness of water is-

The velocity of light is maximum in ______.

In those alcohol tragedies that result in blindness etc., the harm factor is-

World Environmental Day is celebrated every year on:

Which of the following destroys the ozone layer?

Which is the most important organ of the plant in terms of life cycle?

Honey is a major ingredient of