Clouds are
(a) tiny drops of water floating in air
(b) mixture of dust and water vapour
(c) particles of water vapour
(d) rain drops in air.

Correct answer: (a) tiny drops of water floating in air

Explanation: At sufficient heights, water vapour present in the air condenses to form tiny droplets of water floating in air which appear to us as clouds. Later these tiny water droplets come together to form larger-sized water drops and become so heavy that they begin to fall in the form of rain.