Air and Water Worksheet-1

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


  1. 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

(d) Reusing the water from washing clothes to wash the floor


  1. Farmers always plough or turn the soil before they plant seeds because

(a) It loosens the soil and allows air to enter into the spaces between the soil particles

(b) Sprouting seeds will be able to use the trapped air

(c) Plants will absorb some air through their roots and also take in water and minerals from the soil

(d) All of these


  1. Which of the following is not a property of air?

(a) Air is a homogeneous mixture of gases

(b) Air is not a matter because it cannot be seen

(c) Air is highly compressible

(d) Air exerts pressure


  1. In the water cycle, the process that takes place before it rains is

(a) Freezing                                    (b) Condensation

(c) Evaporation                             (d) Melting


  1. A sample of water forms heavy foam or lather with soap. This water is called

(a) Heavy water                            (b) Good water         

(c) Soft water                                (d) Hard water


  1. The boiling point of water is 100 degree c. But a sample when boiled, boils at 130 degree c. This implies that

(a) It was cold

(b) The intensity of flame is not enough

(c) It has some impurities in it

(d) None of these


  1. Hardness of water is due to the presence of

(a) Chlorides and sulphates of calcium and potassium

(b) Bicarbonates, chlorides and sulphates of calcium and magnesium

(c) Bicarbonates, and chlorides of potassium and magnesium

(d) Cicarbonates, chlorides and sulphates of calcium, potassium and magnesium


  1. Acid rain includes

(a) Sulphuric acid and phosphoric acid

(b) Sulphuric acid and nitric acid

(c) Phosphoric acid and nitric acid

(d) Sulphurous acid and nitrous acid


  1. Which of the following are true about acid rain?

(i) Acid rain is very harmful to the environment

(ii) Acid rain can harm aquatic organisms

(iii) Acid rain helps to make environment clean by killing germs


(iv) Acid rain causes damage to building

(a) (i) & (ii)                                     (b) (i) & (iii)

(c) (i), (iii) & (iv)                           (d) (i), (ii) & (iv)


Answer Key:

(1)–C; (2)–D; (3)–D; (4)–B; (5)–B; (6)–C; (7)–C; (8)–B; (9)–B; (10)–D