Explain how the use of CNG in automobiles has reduced pollution in our cities.
CNG has replaced petrol and diesel as fuel in automobiles because petrol and diesel produced a lot of unburnt carbon particles and emitted carbon dioxide and nitrogen oxides and sulphur dioxide. These all gases are poisonous gases and cause various environmental hazards. But CNG is safe because it produces these substances in very small amounts thus reducing pollution in cities.
Give reasons :
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
Give reasons :
LPG is a better domestic fuel than wood.
Compare LPG and wood as fuels.
Give reasons :
Water is not used to control the fire involving electrical equipment.
