Pollution of Air and Water Test - 1

Explanation:

River and lake are common sources of drinking water. Sea and ocean water are salty and cannot be used for drinking purpose.

Explanation:

Vegetable peels, cotton cloths and paper are organic wastes as all of them are obtained from plants. DDT is an insecticide, used to kill insects and pests, and is prepared in laboratory.

Explanation:

Rain water is purest form of water as during cloud formation,evaporation of water takes place in which impurities are left in water bodies. Spring water, subsoil water and hand pump water contains some salt dissolved in it.

Explanation:

Burning of fossil fuels produce carbon dioxide gas, Sulphur dioxide gas and Nitrogen oxide gas. Oxygen gas is not produced by burning of fossil fuels.

Explanation:

Air pollution is caused by combustion of fossil fuels, waste(gases) from factories and burning of coal. Freezing of ice is not responsible for air pollution.

Explanation:

Ponds, river and lake are natural source of water as they are present naturally on earth. On the other hand Canals are man made source of water especially for irrigation purpose.

Explanation:

Residential area, park and crop fields are very less polluted areas while industrial areas have large number of factories that emit harmful gases to cause air pollution.

Explanation:

Water pollution is caused by addition of untreated domestic sewage and industrial wastage in water bodies. They make water unfit for human consumption.

Explanation:

The substances that pollute the natural substances like air, water and soil are called pollutants. Exhaust and sewage from industries,vehicular emission, non-biodegradable materials,silt etc. are some common pollutants.

Explanation:

Whenever harmful substances such as sewage, toxic chemicals, silt, etc., get mixed with water, the water becomes polluted and unfit for human consumption. This is known as water pollution.