1. Objects appear to weigh less in water than air.   True   False   2. Water which is absolutely pure and free from any impurity is known as   Distilled Water   Mineral Water   Spring Water   Boiled Water   Hint Half-n-half Clue   3. Chlorine is added to drinking water to kill microbes that cause illness. This is known as   Chlorination   Elimination   Microbe Termination   Vaporization   Half-n-half Clue   4. Hardness of water is caused by the presence of certain salts in it.   True   False   5. Earth is known as the blue planet because of the presence of   Water   Atmosphere   The continents   Sky   Half-n-half Clue   6. Steam is the _______ form of water.   Gaseous   Solid   Liquid   Impure   Half-n-half Clue   7. Water is known as the universal solvent.   True   False