Pollution of Air and Water Test

Result

Pollution of Air and Water Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Air is regarded as a mixture because:

A
its pressure may vary

B
its temperature may change

C
its volume changes under different conditions

D
its composition may vary

Solution

Air is composed of various gases in different proportions which can be separated using physical methods.
Question 2
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Which is not a green house effect gas?

A
$$CO_2$$

B
$$H_2$$

C
CFC

D
Methane

Solution

A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, thereby trapping and holding heat in the atmosphere. By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming. The most significant greenhouse gases are water vapour (H$$_2$$O), carbon dioxide (CO$$_2$$), methane (CH$$_4$$) and nitrous oxide (N$$_2$$O), according to the Environmental Protection Agency (EPA). Chlorofluorocarbons (CFCs), once used as refrigerants and aerosol propellants until they were phased out by international agreement, are also greenhouse gases. Hence, H$$_2$$ is not a greenhouse gas.
Therefore, the correct answer is option B.
Question 3
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Which of the following gases burns in air?

A
Nitrogen

B
Carbon dioxide

C
Carbon monoxide

D
Helium

Solution

Out of the given options, nitrogen, carbon dioxide, and helium do not burn in the air. But carbon monoxide burns in the air to produce carbon dioxide.
Question 4
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Purification of water for civil supplies is done by:

A
Chlorination

B
Distillation

C
Filtration

D
Decantation

Solution

Purification of municipal water supplies is done by the method of chlorination. Water is treated by using chlorine as water disinfectant which kills the pathogenic bacteria or microbes present in the water, making water suitable for drinking purposes.
Question 5
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The percentage of nitrogen and oxygen in air is:

A
21% by volume

B
50% by weight

C
37% by weight

D
99% by volume

E
29% by volume

Solution

Nitrogen and oxygen together make up 99% of air.
Question 6
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Which one of the following gas does not form a part of the atmosphere?

A
Nitrogen

B
Chlorine

C
Carbon dioxide

D
Oxygen

Solution

Nitrogen $$(N_2)- 78 \% \ of \ air$$, Carbon dioxide $$(CO_2)- 0.04 \%\ of \ air$$ and Oxygen$$(O_2)- 21 \% \ of \ air$$ are a part of the atmosphere but chlorine $$(Cl_2)$$ does not form a part of the atmosphere.
Question 7
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Sewage is a complex mixture containing suspended:

A
organic and inorganic impurities

B
inorganic impurities

C
organic impurities

D
food wastes

Solution

Sewage contains both organic and inorganic impurities, that include food wastes and microorganisms (organic), detergents (inorganic), etc.
Question 8
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Global warming is the result of the increase in ________ in air.

A
nitrogen

B
oxygen

C
water vapour

D
carbon dioxide

Solution

The $$CO_2$$ is a gas that traps heat and lets the glaciers melt, which causes an increase in global warming.
Question 9
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Sometimes it may be necessary to disinfect water with chemicals like ______ before releasing it into the distribution system.

A
chlorine

B
ozone

C
Both A and B

D
none of the above

Solution

Chlorine and Ozone are used as disinfectants for water treatment as they are effective in killing microbes like viruses and bacteria.
So, the option is C.
Question 10
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The correct ascending order of gases as per their composition in air is:

A
oxygen < carbon dioxide < nitrogen

B
hydrogen < oxygen < nitrogen

C
nitrogen < hydrogen < oxygen

D
oxygen < carbon dioxide < hydrogen

Solution

By volume dry air contains $$78.09\%$$ Nitrogen, $$20.95\%$$ Oxygen, $$0.93\%$$ Argon, $$0.04\%$$ Carbon dioxide and small traces of other gases.
Ascending order of gases as per their composition in air is-
Hydrogen $$<$$ Oxygen $$<$$ Nitrogen

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Re-Attempt Weekly Quiz Competition

Pollution of Air and Water Test - 25

Result

Pollution of Air and Water Test - 25

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SHARING IS CARING

Question 1

its pressure may vary

its temperature may change

its volume changes under different conditions

its composition may vary

Solution

Question 2

$$CO_2$$

$$H_2$$

CFC

Methane

Solution

Question 3

Nitrogen

Carbon dioxide

Carbon monoxide

Helium

Solution

Question 4

Chlorination

Distillation

Filtration

Decantation

Solution

Question 5

21% by volume

50% by weight

37% by weight

99% by volume

29% by volume

Solution

Question 6

Nitrogen

Chlorine

Carbon dioxide

Oxygen

Solution

Question 7

organic and inorganic impurities

inorganic impurities

organic impurities

food wastes

Solution

Question 8

nitrogen

oxygen

water vapour

carbon dioxide

Solution

Question 9

chlorine

ozone

Both A and B

none of the above

Solution

Question 10

oxygen < carbon dioxide < nitrogen

hydrogen < oxygen < nitrogen

nitrogen < hydrogen < oxygen

oxygen < carbon dioxide < hydrogen

Solution

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