1. Which gas in the atmosphere saves us from the UV rays of the sun?   Oxygen   Ozone   Nitrogen   Carbon Monoxide   Hint Half-n-half Clue   2. Fish breathe through   Lungs   Skin   Gills   Nose   Half-n-half Clue   3. A space that contains no air or any gas is known as   Bubble   Vacuum   Pressurized Cabin   Hollow   Half-n-half Clue   4. Which of the following is NOT a noble gas?   Argon   Hydrogen   Krypton   Helium   Half-n-half Clue   5. Dry ice is   Ice with salt added   Any Frozen Liquid   Solid Carbon Dioxide   Very Cold Ice   Half-n-half Clue   6. What gas is evolved when HCl is poured on marble chips?   Carbon Dioxide   Hydrogen Peroxide   Hydrogen   Calcium Carbonate   Half-n-half Clue   7. A barometer is used for measuring   Atmospheric Pressure   Annual Rainfall   Temperature   Humidity   Half-n-half Clue