Pollution of Air and Water Test

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Pollution of Air and Water Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

As proved by many studies, the greenhouse effect is rapidly increasing because of increase in the concentration of carbon dioxide. In the given graph, the increase in carbon dioxide concentration is shown. What could be $$X$$ corresponding to it?
(i) Rate of photosynthesis in plants
(ii) $$pH$$ of the oceans
(iii) Water level of ocean
(iv) Average global temperature of earth

A
(i) and (iii)

B
(ii) and (iv)

C
(ii) only

D
(iv) only

Solution

The recent phenomenon of global warming has been attributed primarily to increasing industrial $$CO_2$$ emissions into Earth's atmosphere. An estimated 3% of the $$CO_2$$ released by humans into the atmosphere dissolves into oceans, rivers and lakes which contributes to ocean acidification.
Hence, only (ii) is correct.
Question 2
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Smog is an example of:

A
ice dispersed in air

B
water dispersed in air

C
smoke dispersed in air

D
smoke and water dispersed in air

Solution

Smog is made of smoke and fog (tiny water particles suspended in air). Smoke has oxides of nitrogen which combine with other air pollutants and fog, thus producing smog.
Question 3
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Soap and detergents are the source of organic pollutants like:

A
Glycerol

B
Polyphosphates

C
Sulphonated hydrocarbons

D
All of these
Question 4
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___________ is the phenomenon where the earth retains heat.

A
Air pollution

B
Green house effect

C
Global effect

D
Land pollution

Solution
Question 5
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The green house gases, otherwise called radioactively active gases includes

A
Carbon dioxide

B
$$CH_{4}$$

C
$$N_{2}O$$

D
All of these

Solution
Question 6
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Read the given passage and select the correct option. X is a gas which occurs both in the earth's upper atmosphere (stratosphere) and at earth's ground level. Y are the substances which react with X and destroy the same. Beijing protocol was held to lay down steps to reduce Y released by developing and developed countries. Destruction of X can lead to diseases like cancer in humans.

A
X prevent the harmful UV radiations from reaching the earth and also functions as green house gas.

B
Cooling devices like air conditioners and refrigerators contribute to increase in Y in the earth's atmosphere.

C
Maximum effect of Y occurs due to release of active chlorine which remains functional for a long time.

D
All of these

Solution

Here $$X$$ refers to oxygen gas which occurs in earth's upper atmosphere (stratosphere) as Ozone($$O_3$$) layer and at earth's ground level oxygen($$O_2$$) is present.

Here $$Y$$ refers to chloroflurocarbons (CFC) which reacts with oxygen to destroy ozone layer.

Among the given statements all of them are correct as ozone prevents the harmful UV radiation reaching earth and CFC's are emitted by air conditioners and refrigerators, and also maximum effect of CFC'S occurs due to release of active chlorine which remains functional for a long time.

Hence, option $$D$$ is correct.
Question 7
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Which among the given is not a natural source of air pollution?

A
Automobile exhausts

B
Vegetation decay

C
Forest fire

D
Volcanic eruptions

Solution

Automobile exhaustion is not a natural source of air pollution, it is man-made air pollution.
It is emitted as a result of the combustion of fuels such as natural gas, gasoline, petrol,bio-diesel etc.
It discharges a large amount of $$CO_2$$(carbon dioxide), $$NO$$, $$CO$$, $$ozone$$ etc.

Hence, the correct option is $$A$$.
Question 8
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Why are the environmental scientist worried about the effect of $$Q$$ on $$P$$?

A
Because $$Q$$ emits sulphur oxides in air which cause acid rain over $$P$$

B
Because $$Q$$ emits nitric acid in air which drops in the form of acid rain over $$P$$

C
Because $$Q$$ emits soots particles in air which blackens $$P$$

D
Both A and C

Solution
Question 9
1 / -0

Carbon dioxide is called greenhouse gas because

A
it traps heat

B
it is used in photosynthesis

C
it is exhaled during respiration

D
its does not support combustion

Solution

Carbon dioxide is an important gas as it is involved in the processes like respiration and photosynthesis. It is also used in fire extinguishers as it does not support combustion. But carbon- dioxide is called a greenhouse gas because it traps the heat coming from the sun. This helps in keeping the earth warm. But an increased amount of greenhouse gases will cause a greater amount of heat to be traped. This can be harmful to life on earth.
Question 10
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Simple inorganic substances released into environment is reused by ______.

A
Pyrolysis reactor

B
Pyrolysis chamber

C
Simple reactor

D
Simple chamber

Solution

An ablative pyrolysis reactor is used to treat inorganic substances. The surface is heated by hot fuel gas produced by the combustion of pyrolysis gases or charcoal. It rotates while biomass is pressed onto the hot surface.
So, option A is the correct option.