Air & Water

Air and Water Worksheet-1

1. The water from taps which we drink is sweet while distilled water is bitter and we cannot drink it. This is due to

(a) Addition of sugar to tap water

(b) Dissolved gases and salts in tap water

(c) Chemical treatment

(d) Both Addition of sugar to tap water & Chemical treatment

2. We can recycle water by………….

(a) Reusing the water from washing clothes to cook

(b) Discharging factory waster into canals and seas

(c) Discharging sewage and waste materials into the ocean

Air and Water Worksheet-2

1. The gas is only about 20 parts out of 100 of air in the atmosphere. It is needed for decomposition of organic matter to take place. This gas is

(a) Carbon dioxide                       (b) Water vapour

(c) Oxygen                                      (d) Nitrogen

2. Identify the incorrect data