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Pollution Of Air And Water

The oxygen carrying capacity of blood is reduced by

a) Nitrogen dioxide.
b) Carbon dioxide.
c) Carbon monoxide.
d) Dust.

✔Answer

✔Solution

Correct Answer Is : Carbon monoxide.

Solution Is : Carbon monoxide (CO) is a poisonous gas. It reduces the oxygen carrying capacity of the blood.

The gas responsible for green house effect is

a) Carbonmonoxide.
b) Sulphurdioxide.
c) Oxygen.
d) Carbon dioxide.

✔Answer

✔Solution

Correct Answer Is : Carbon dioxide.

Solution Is : The absorption of solar energy by gases like carbon dioxide, methane etc., in the atmosphere is known as Green House Effect. CO and sulphurdioxide are poisonous gases and are not green house gases. Oxygen is also not a green house gas. It is essential for breathing.

The resource used as a cleaner fuel is

a) Coal.
b) CNG.
c) Diesel.
d) Petrol.

✔Answer

✔Solution

Correct Answer Is : CNG.

Solution Is : CNG (Compressed Natural Gas) is used as a cleaner fuel, as unlike coal, diesel and petrol, it does not release a lot of harmful gases in the air.

When the radiations of the sun get trapped in the earth`s environment, it is called as

a) Global warming.
b) Greenhouse gas.
c) Depletion of ozone.
d) Greenhouse effect.

✔Answer

✔Solution

Correct Answer Is : Greenhouse effect.

Solution Is : A part of the radiations that falls on the earth is absorbed and a part is reflected back into the space. Further, a part of the reflected radiations is trapped by the atmosphere, which warms up the earth.

The excess amount of the gas that acts as a pollutant is

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

✔Answer

✔Solution

Correct Answer Is : Carbon dioxide.

Solution Is : Carbon dioxide is mostly released during respiration. Moreover, deforestation leads to an increase in the amount of carbon dioxide in the air, because the number of trees which consume carbon dioxide during photosynthesis is reduced. Acting as a pollutant gas, carbon dioxide traps the heat and does not allow it to escape into the space. As a result, the average temperature of the earth`s atmosphere gradually increases. This is called global warming.

Corrosion of marbles is also known as

a) Marble erosion.
b) Marble cancer.
c) Marble disorder.
d) Rusting.

✔Answer

✔Solution

Correct Answer Is : Marble cancer.

Solution Is : The phenomenon in which white marble corrodes to yellow due to acid rain is known as marble cancer. Marble erosion is the process of carrying away of particles of marble surface by wind or water etc. Displacement of marbles is called marble disorder. Corrosion of iron is called rusting. Rust (hydrated iron III oxide) is formed when iron is kept in damp air for a long time.

The Kyoto Protocol agreement is to

a) Increase the emission of greenhouse gases.
b) Decrease the emission of greenhouse gases. .
c) Increase the emission of sulphur dioxide.
d) Decrease the emission of sulphur dioxide

✔Answer

✔Solution

Correct Answer Is : Decrease the emission of greenhouse gases. .

Solution Is : Global warming has become a major concern for governments worldwide. Many countries have reached an agreement to reduce the emission of greenhouse gases. The Kyoto Protocol is one such agreement.

Acid rain is formed when sulphur dioxide and nitrogen dioxide reacts with

a) Smoke.
b) Dust.
c) CFCs.
d) Water vapour.

✔Answer

✔Solution

Correct Answer Is : Water vapour.

Solution Is : Acid rain is formed when sulphur dioxide and nitrogen dioxide react with water vapour in air to form sulphuric acid and nitric acid respectively. Smoke, dust and CFCs (Chlorofluorocarbons) are air pollutants.

River Ganga is polluted because of

a) The distance it is travelling.
b) The increase in population.
c) The decrease in population.
d) Limited oxygen.

✔Answer

✔Solution

Correct Answer Is : The increase in population.

Solution Is : The Ganga at Kanpur in Uttar Pradesh (U.P.), has one of the most polluted stretches of the river. Kanpur is one of the most populated towns in U.P. At Kanpur the amount of water is comparatively small and the flow of the river is very slow. In addition, Kanpur has more than 5,000 industries. These include fertiliser, detergent, leather and paint industries. These industrial units discharge toxic chemical wastes into the river.

Which of the following Indian river is considered as one of the ten most polluted rivers in the world?

a) Brhmaputra
b) Kavery
c) Ganga
d) Yamuna

✔Answer

✔Solution

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Class 8 Science Study Material

Pollution Of Air And Water

The oxygen carrying capacity of blood is reduced by

Correct Answer Is : Carbon monoxide.

Solution Is : Carbon monoxide (CO) is a poisonous gas. It reduces the oxygen carrying capacity of the blood.

The gas responsible for green house effect is

Correct Answer Is : Carbon dioxide.

Solution Is : The absorption of solar energy by gases like carbon dioxide, methane etc., in the atmosphere is known as Green House Effect. CO and sulphurdioxide are poisonous gases and are not green house gases. Oxygen is also not a green house gas. It is essential for breathing.

The resource used as a cleaner fuel is

Correct Answer Is : CNG.

Solution Is : CNG (Compressed Natural Gas) is used as a cleaner fuel, as unlike coal, diesel and petrol, it does not release a lot of harmful gases in the air.

When the radiations of the sun get trapped in the earth`s environment, it is called as

Correct Answer Is : Greenhouse effect.

Solution Is : A part of the radiations that falls on the earth is absorbed and a part is reflected back into the space. Further, a part of the reflected radiations is trapped by the atmosphere, which warms up the earth.

The excess amount of the gas that acts as a pollutant is

Correct Answer Is : Carbon dioxide.

Corrosion of marbles is also known as

Correct Answer Is : Marble cancer.

The Kyoto Protocol agreement is to

Correct Answer Is : Decrease the emission of greenhouse gases. .

Solution Is : Global warming has become a major concern for governments worldwide. Many countries have reached an agreement to reduce the emission of greenhouse gases. The Kyoto Protocol is one such agreement.

Acid rain is formed when sulphur dioxide and nitrogen dioxide reacts with

Correct Answer Is : Water vapour.

Solution Is : Acid rain is formed when sulphur dioxide and nitrogen dioxide react with water vapour in air to form sulphuric acid and nitric acid respectively. Smoke, dust and CFCs (Chlorofluorocarbons) are air pollutants.

River Ganga is polluted because of

Correct Answer Is : The increase in population.

Which of the following Indian river is considered as one of the ten most polluted rivers in the world?

Correct Answer Is : Ganga

Solution Is : According to World Wide Fund for Nature (WWF), Ganga is one of the ten most endangered rivers in the world.

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