1. Which of the following is NOT a noble gas?   Hydrogen   Argon   Krypton   Helium   Hint Half-n-half Clue   2. Which of the following is not a constituent of the atmosphere?   Aluminum   Carbon Dioxide   Nitrogen   Oxygen   Half-n-half Clue   3. Lime water turns milky after carbon dioxide is passed through it.   True   False   4. Which of the following is necessary for a substance to burn?   Gasoline   Light   Hydrogen   Oxygen   Half-n-half Clue   5. Carbon dioxide is lighter than air.   True   False   6. A barometer is used for measuring   Annual Rainfall   Temperature   Humidity   Atmospheric Pressure   Half-n-half Clue   7. The atmosphere exerts pressure on the surface of the earth.   True   False