1. Objects appear to weigh less in water than air.   True   False   2. The process of conversion of water vapor to water on the surface of a cold glass tumbler is known as   Condensation   Evaporation   Boiling   Vaporization   Hint Half-n-half Clue   3. Hardness of water is caused by the presence of certain salts in it.   True   False   4. What is formed when hydrogen burns in oxygen?   Water   Carbon Dioxide   Hydrogen Peroxide   Carbon Monoxide   Half-n-half Clue   5. Water at room temperature is a   Liquid   Solid   Gas   Plasma   Half-n-half Clue   6. It is easy to make lather with hard water.   True   False   7. Most of the pure, drinkable water of the earth is in form of   Icebergs   Vapor and Clouds   Spring and River water   Water in the Oceans   Half-n-half Clue