Pollution of Air and Water Test

Result

Pollution of Air and Water Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

The gas associated with the greenhouse effect is:

A
carbon dioxide

B
oxygen

C
nitrogen dioxide

D
sulphur dioxide

Solution

Carbon dioxide $$(CO_2)$$ is the primary greenhouse gas emitted through human activities.
Question 2
1 / -0

Which of the following is not a direct cause of air pollution?

A
Thinning of the ozone layer

B
Increase in the number of diabetic patients

C
Destruction of habitats

D
Global warming

Solution

Air pollution leads to thinning of the ozone layer.

Destruction of aerial habitats and global warming takes place in air pollution.

But the increase in the number of diabetic patients does not take place due to air pollution.

Hence, the correct option is $$\text{B}$$
Question 3
1 / -0

Which of the following does not cause any kind of pollution?

A
Establishing forest reserves

B
Using pesticides in farms

C
Developing housing estates

D
All of these cause pollution

Solution

Afforestation is the process of planting trees to retain soil health and it is a conservation effort of establishing forests. This activity doesn't cause any kind of harm to the environment.

Other activities like using pesticides cause water pollution, developing estates create land pollution by construction activities.

Option A is correct.
Question 4
1 / -0

The gases released from vehicle exhausts are:
I. Carbon monoxide
II. Sulphur dioxide
III. Oxides of nitrogen

A
I and II only

B
I and III only

C
II and III only

D
I, II and III

Solution

The gases released from vehicle exhausts are nitrogen ($$N_2$$), water vapor ($$H_2O$$), and carbon dioxide ($$CO_2$$), carbon monoxide ($$CO$$), nitrogen oxides ($$NO_x$$), particulate matter (mostly soot) and sulphur dioxide.
Hence option D is correct.
Question 5
1 / -0

The earth reflects .......... energy into atmosphere.

A
light

B
heat

C
hydro

D
wind

Solution

Heat radiations from the sun are absorbed by the earth's surface and are reflected in the atmosphere which is the cause of the greenhouse effect.
Question 6
1 / -0

When heat is reflected from the earth's surface and trapped in the atmosphere, this phenomenon is referred to as:

A
Global warming

B
Ozone depletion

C
The Greenhouse effect

D
Thermal pollution

Solution

Global warming is the increase in the average temperature of the Earth's near-surface air and the oceans because of the Greenhouse effect.

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.

Thus option C is correct.
Question 7
1 / -0

Which of the following statements is not true?

A
$$CO_2$$ is the best fire extinguisher.

B
Global warming can cause acid rain.

C
Burning of coal and diesel releases sulphur dioxide gas.

D
LPG has higher calorific value than biogas.

Solution

Global warming may cause glaciers to melt, which may lead to the rise in sea level and submerge low-lying areas but does not cause acid rain.
Question 8
1 / -0

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, $$0.03\%$$ Carbon dioxide and small traces of other gases. There is a small amount of hydrogen gas in the Earth's atmosphere; it makes up less than one part per million.
Ascending order of gases as per their composition in air is:
Hydrogen $$<$$ Oxygen $$<$$ Nitrogen
Question 9
1 / -0

Which of the following is not a feature of potable water?

A
It must be clean, colourless and odourless.

B
It must be free from bacteria.

C
It must have excessive sodium, calcium, and magnesium as they give a special taste.

D
It must contain dissolved oxygen and carbon dioxide.

Solution

Potable water is water that is fit for consumption by humans. Potable water is clean, colorless, odorless, bacteria-free, and has dissolved oxygen and carbon dioxide. It also has dissolved minerals like sodium, calcium, and magnesium. But if these minerals are present in excess amounts, they will cause health issues.
Hence, the correct option is $$\text{C}$$
Question 10
1 / -0

Which method of water purification does not kill microorganisms?

A
Boiling

B
Filtration

C
Chlorination

D
Distillation

Solution

Filteration is a physical method that can only separate the pathogens and other contaminants from water but cannot kill microorganism.

Boiling kills all the pathogens at boiling temperature.

Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules.

Distillation relies on evaporation to purify water. Contaminated water is heated to form steam. The boiling process kills microorganisms such as bacteria and some viruses.

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Re-Attempt Weekly Quiz Competition

Pollution of Air and Water Test - 22

Result

Pollution of Air and Water Test - 22

Score

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Rank

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SHARING IS CARING

Question 1

carbon dioxide

oxygen

nitrogen dioxide

sulphur dioxide

Solution

Question 2

Thinning of the ozone layer

Increase in the number of diabetic patients

Destruction of habitats

Global warming

Solution

Question 3

Establishing forest reserves

Using pesticides in farms

Developing housing estates

All of these cause pollution

Solution

Question 4

I and II only

I and III only

II and III only

I, II and III

Solution

Question 5

light

heat

hydro

wind

Solution

Question 6

Global warming

Ozone depletion

The Greenhouse effect

Thermal pollution

Solution

Question 7

$$CO_2$$ is the best fire extinguisher.

Global warming can cause acid rain.

Burning of coal and diesel releases sulphur dioxide gas.

LPG has higher calorific value than biogas.

Solution

Question 8

oxygen < carbon dioxide < nitrogen

hydrogen < oxygen < nitrogen

nitrogen < hydrogen < oxygen

oxygen < carbon dioxide < hydrogen

Solution

Question 9

It must be clean, colourless and odourless.

It must be free from bacteria.

It must have excessive sodium, calcium, and magnesium as they give a special taste.

It must contain dissolved oxygen and carbon dioxide.

Solution

Question 10

Boiling

Filtration

Chlorination

Distillation

Solution

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