Question :  The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Option 1: tendency of carbon dioxide to form a layer along with dust smoke

Option 2: lack of oxygen in the surrounding Sigrees

Option 3: accumulation of smoke and dust over the Sigrees

Option 4: interrupted release of moisture from the material

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 : Which of the following gases shields the surface of the Earth from ultraviolet (UV) radiation from the Sun?

Option 1: Carbon monoxide

Option 2: Ozone

Option 3: Oxygen

Option 4: Carbon dioxide

Question : Dry ice is

Option 1: Solid ammonia

Option 2: Solid sulphur dioxide

Option 3: Dry carbon dioxide

Option 4: Solid carbon dioxide

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