1. 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.

Solution:

• : tiny drops of water floating in air

Water vapour present in air condenses to form tiny droplets of water floating in air which appear to us as clouds. Later these tiny water droplets are formed into larger sized water drops and then get converted to rainfall.