Water-A Precious Resource

Water-A Precious Resource Worksheet-1

1. Air coolers are recommended in which of the following areas?

(a) Very humid areas

(b) Desert areas

(c) Both of these

2. Which of the following is not the property of pure water?

(a) It is colourless and odourless liquid

(b) Pure water has minimum density at 4ºC

(c) Pure water is the poor conductor of electricity

(d) Water shows the phenomena of anomalous expansion

Water-A Precious Resource Worksheet-2

1. The freezing point of water is 0 ºC at:

(a) 76 cm of Hg                             (b) 760 cm of Hg

(c) 760 mm of Hg                        (d) 7.6 mm of Hg

2. Which of the following property of icebergs led to the sinking of the famous titanic ship?

(a) Relatively higher density of ice

(b) Only 10 % of the iceberg was above the sea water which couldn’t be seen

(c) Heavy water currents

(d) None of these

Water-A Precious Resource Worksheet-3

1. Why food gets cooked in less time in pressure cooker?

(a) Boiling point of water increases with decrease in pressure

(b) Boiling point of water decrease with increases in pressure

(c) Boiling point of water increases with increase in pressure

(d) None of these

2. Which of the following is used for the purification of surface water to make it free from germs so that it can be used for drinking purposes?

(a) Carbon         (b) Oxygen        (c) Chlorine       (d) Fluorine