Question : Which one out of the following helps in burning?

Option 1: Oxygen

Option 2: Carbon monoxide

Option 3: Nitrogen

Option 4: Carbon dioxide

Question : The highest volume of gases in the lower atmosphere is comprised of

Option 1: Hydrogen

Option 2: Carbon dioxide

Option 3: Oxygen

Option 4: Nitrogen

Question : Dry ice is

Option 1: Solid ammonia

Option 2: Solid sulphur dioxide

Option 3: Dry carbon dioxide

Option 4: Solid carbon dioxide

Question : 'Greenhouse effect' means

Option 1: Cultivation of crops in a greenhouse to conserve heat

Option 2: Trapping of solar energy due to carbon dioxide gases

Option 3: Trapping of solar energy by the Earth's upper surface

Option 4: Increase of heat due to atmospheric pollution

Question : When the bread rises and bakes, __________creates thousands of bubbles in the dough.

Option 1: phosphorus

Option 2: nitrogen

Option 3: oxygen

Option 4: carbon dioxide