1. Water exerts pressure on the walls and the bottom of the container in which it is placed.   True   False   2. Objects appear to weigh less in water than air.   True   False   3. Earth is known as the blue planet because of the presence of   Water   Atmosphere   The continents   Sky   Hint Half-n-half Clue   4. What is formed when hydrogen burns in oxygen?   Water   Carbon Dioxide   Hydrogen Peroxide   Carbon Monoxide   Half-n-half Clue   5. Water that is suitable for drinking is known as   Potable Water   Chlorinated Water   Distilled Water   Natural Water   Half-n-half Clue   6. Hardness of water is caused by the presence of certain salts in it.   True   False   7. What falls to the ground when clouds become too heavy?   Rain (Raindrops)   Lightning   Thunder   Mineral Salts   Half-n-half Clue