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Pollution Of Air And Water

The problem caused by smog is

a) Respiratory problem.
b) Digestive problem.
c) Heart problem.
d) Excretory problem.

✔Answer

✔Solution

Correct Answer Is : Respiratory problem.

Solution Is : Smog is made up of smoke and fog. Smoke may contain oxides of nitrogen which combine with other air pollutants and fog to form smog. The smog causes breathing difficulties such as asthma, cough and wheesing in children.

The addition of undesired and harmful substances in our environment is called

a) Purification.
b) Population.
c) Pollution.
d) Suffocation.

✔Answer

✔Solution

Correct Answer Is : Pollution.

Solution Is : Pollution is the addition of contaminants into an environment that cause harm to living organisms and non-living components.

The gas that forms the major part of the air is

a) Oxygen.
b) Nitrogen.
c) Carbon dioxide.
d) Ozone.

✔Answer

✔Solution

Correct Answer Is : Nitrogen.

Solution Is : In air, nitrogen is about 78% and oxygen is about 21% by volume. Carbon dioxide and ozone are present in small quantity.

The contamination of air by unwanted and harmful substances is known as

a) Noise pollution.
b) Air pollution.
c) Water pollution.
d) Soil pollution.

✔Answer

✔Solution

Correct Answer Is : Air pollution.

Solution Is : Air pollution is the contamination of air by the impurities which adversely affect the living organisms and the non-living components.

Smoke is

a) An air pollutant.
b) A water pollutant.
c) A sound pollutant.
d) A soil pollutant.

✔Answer

✔Solution

Correct Answer Is : An air pollutant.

Solution Is : The substances which contaminate the air are called air pollutants. Sometimes, such substances may come from natural sources like smoke and dust, arising from forest fires or volcanic eruptions.

Incomplete combustion of fuels produces

a) Carbon monoxide gas.
b) Oxygen gas.
c) Nitrogen gas.
d) Argon gas.

✔Answer

✔Solution

Correct Answer Is : Carbon monoxide gas.

Solution Is : Incomplete combustion of fuels produces carbon monoxide which is a poisonous gas. It decreases the oxygen carrying capacity of blood.

Ozone is a

a) Liquid.
b) Solid.
c) Gas.
d) Metal.

✔Answer

✔Solution

Correct Answer Is : Gas.

Solution Is : Ozone is a gas, which forms a layer in the atmosphere. The ozone layer protects us from harmful ultraviolet rays of the sun.

Ozone layer is depleting due to the presence of

a) Nitrogen dioxide.
b) Carbon monoxide.
c) Sulphur dioxide.
d) Chlorofluorocarbons.

✔Answer

✔Solution

Correct Answer Is : Chlorofluorocarbons.

Solution Is : Chlorofluorocarbons (CFCs) introduced in the air from aerosol sprays and refrigerating equipments damage the ozone layer of the atmosphere. Nitrogen dioxide, carbon monoxide and sulphur dioxide are air pollutants but they do not damage the ozone layer.

The Taj Mahal is being affected because of

a) Noise pollution.
b) Air pollution.
c) Water pollution.
d) Sound pollution.

✔Answer

✔Solution

Correct Answer Is : Air pollution.

Solution Is : The colour of white marble is affected by air pollution and not by water, noise or sound pollution. Polluted air contains sulphur dioxide and nitrogen dioxide, which forms acid rain. The acid rain corrodes the Taj mahal.

Which of the following is a poisonous gas forming acid rain and emitted by Mathura oil refinery

a) CO²
b) CO
c) O²
d) SO²

✔Answer

✔Solution

Correct Answer Is : SO²

Solution Is : SO² is a poisonous gas. It reacts with the water vapour present in air to form sulphuric acid. The rain containing sulphuric acid and nitric acid is called Acid rain. CO² and O² are not poisonous gases. CO is a poisonous gas but it does not form acid rain.

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Class 8 Science Study Material

Pollution Of Air And Water

The problem caused by smog is

Correct Answer Is : Respiratory problem.

Solution Is : Smog is made up of smoke and fog. Smoke may contain oxides of nitrogen which combine with other air pollutants and fog to form smog. The smog causes breathing difficulties such as asthma, cough and wheesing in children.

The addition of undesired and harmful substances in our environment is called

Correct Answer Is : Pollution.

Solution Is : Pollution is the addition of contaminants into an environment that cause harm to living organisms and non-living components.

The gas that forms the major part of the air is

Correct Answer Is : Nitrogen.

Solution Is : In air, nitrogen is about 78% and oxygen is about 21% by volume. Carbon dioxide and ozone are present in small quantity.

The contamination of air by unwanted and harmful substances is known as

Correct Answer Is : Air pollution.

Solution Is : Air pollution is the contamination of air by the impurities which adversely affect the living organisms and the non-living components.

Smoke is

Correct Answer Is : An air pollutant.

Solution Is : The substances which contaminate the air are called air pollutants. Sometimes, such substances may come from natural sources like smoke and dust, arising from forest fires or volcanic eruptions.

Incomplete combustion of fuels produces

Correct Answer Is : Carbon monoxide gas.

Solution Is : Incomplete combustion of fuels produces carbon monoxide which is a poisonous gas. It decreases the oxygen carrying capacity of blood.

Ozone is a

Correct Answer Is : Gas.

Solution Is : Ozone is a gas, which forms a layer in the atmosphere. The ozone layer protects us from harmful ultraviolet rays of the sun.

Ozone layer is depleting due to the presence of

Correct Answer Is : Chlorofluorocarbons.

Solution Is : Chlorofluorocarbons (CFCs) introduced in the air from aerosol sprays and refrigerating equipments damage the ozone layer of the atmosphere. Nitrogen dioxide, carbon monoxide and sulphur dioxide are air pollutants but they do not damage the ozone layer.

The Taj Mahal is being affected because of

Correct Answer Is : Air pollution.

Solution Is : The colour of white marble is affected by air pollution and not by water, noise or sound pollution. Polluted air contains sulphur dioxide and nitrogen dioxide, which forms acid rain. The acid rain corrodes the Taj mahal.

Which of the following is a poisonous gas forming acid rain and emitted by Mathura oil refinery

Correct Answer Is : SO2

Solution Is : SO2 is a poisonous gas. It reacts with the water vapour present in air to form sulphuric acid. The rain containing sulphuric acid and nitric acid is called Acid rain. CO2 and O2 are not poisonous gases. CO is a poisonous gas but it does not form acid rain.

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Correct Answer Is : SO²

Solution Is : SO² is a poisonous gas. It reacts with the water vapour present in air to form sulphuric acid. The rain containing sulphuric acid and nitric acid is called Acid rain. CO² and O² are not poisonous gases. CO is a poisonous gas but it does not form acid rain.