Which of the following Key is not found in normal

The phenomenon due to which the sky appears blue is

The force required to maintain an object at a constant velocity is

With increase in impurities, the boiling point of water _________?

A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is –

The speed of sound in the following media are Va, Vb and Vc for air, water and steel. Arrange the speed of sound.

Which one of the following diseases in humans can spread through air?

Which of the following is most correct about a balanced diet?

Which of the following is the hardest substance known?

Group number and valency have no relation in

Which gas is used in the process of photosynthesis?