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CBSE Questions for Class 8 Chemistry Pollution Of Air And Water Quiz 1 - MCQExams.com
CBSE
Class 8 Chemistry
Pollution Of Air And Water
Quiz 1
What causes the global warming?
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0%
Burning of fossil fuels
0%
Deforestation
0%
Industrialization
0%
All of the above
Explanation
Global warming is the slow increase in the average temperature of the earth’s atmosphere because of an increased amount of greenhouse gases.
All the given activities increase the number of greenhouse gases in the atmosphere and hence global warming.
Which of the following are greenhouse gases?
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Carbon dioxide
0%
Water vapour
0%
Both A and B
0%
None of these
Explanation
Greenhouse gases are those that contribute to greenhouse effect by absorbing infrared radiation.
Carbon dioxide and water-vapour are examples of greenhouse gases.
So, option C is correct.
A greenhouse gas that absorbs energy and maintains earth's temperature is:
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carbon dioxide
0%
oxygen
0%
nitrogen
0%
argon
Explanation
A greenhouse gas that absorbs energy and maintains the earth's temperature is carbon dioxide $$(CO_2)$$. Other greenhouse gases are methane $$(CH_4)$$, nitrous oxide $$(N_2O)$$, and chloro-fluoro-carbon$$(CFC)$$.
In which of the following pairs, both of them are common greenhouse gases?
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Oxygen, water vapour
0%
Methane, carbondioxide
0%
Ozone, nitrogen
0%
Methane,
Oxygen
Explanation
The primary greenhouse gases are water vapour, carbon dioxide, methane, nitrous oxide and ozone.
Soap and detergents are the source of organic pollutants like:
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Glycerol
0%
Polyphosphates
0%
Sulphonated hydrocarbons
0%
All of these
What are characteristics of 'domestic' wastewater?
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Grey color, musty odour
0%
Blue color, odourless
0%
Green color, musty odour
0%
All of Above
___________ is the phenomenon where the earth retains heat.
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Air pollution
0%
Green house effect
0%
Global effect
0%
Land pollution
The holy river of India is:
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Ganga
0%
Bedach
0%
Banas
0%
Kosi
Explanation
The holy river of India is Ganga. The whole river from Himalayan glaciers across the vast north Indian plain to the filigree delta on the Bay of Bengal is worshipped as a life-affirming goddess.
In which year Ganga Action Plan was launched ?
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$$1980$$
0%
$$1984$$
0%
$$1982$$
0%
$$1985$$
Explanation
An ambitious plan to save the river, called the $$\text {Ganga Action Plan}$$ was launched in $$1985$$.
The component which is not present in air is?
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Nitrogen
0%
Oxygen
0%
Carbon dioxide
0%
Chlorine
Explanation
Air does not contain chlorine. It is a mixture of other gases like nitrogen, oxygen, carbon dioxide, helium, hydrogen, argon, etc.
Water that can be used for drinking known as_____
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salt water
0%
potable water
0%
sewage water
0%
chemical water
0%
none of these
The quantity of $$CO_{2}$$ in atmosphere can be decreased by:
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rain
0%
forests
0%
vegetation
0%
all of the above
Explanation
Plants play a very important role in reducing the amount of $$CO_2$$ in the atmosphere, plants use $$CO_2$$ to make food and release oxygen. During rain, water gets reacted with $$CO_2$$ in the atmosphere and form $$H_2CO_3$$ and hence reduce the amount of $$CO_2$$ in the atmosphere.
Which of the following is not a green house gas?
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Nitrogen
0%
Water vapour
0%
Methane
0%
Carbon dioxide
Explanation
Water vapour, methane and Carbon dioxide are some of the examples of green house gases. Greenhouse gases trap heat in the atmosphere and warm the planet.
Nitrogen is not a green house gas as it doesn't show this property.
John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make?
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Air is a gas
0%
Air has mass
0%
Air is matter
0%
Air occupies space
Explanation
When a balloon is filled with air then the air exerts force on the walls of the balloon. Due to this force the balloon material stretches and hence size of balloon increases.
Governments have already taken action against air pollution by introducing ________.
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wind energy
0%
solar energy
0%
renewable energy
0%
all of the above
Explanation
Governments have already taken action against air pollution by introducing green energy like wind energy, solar energy, and renewable energy to minimize the burning of fuels that cause heavy air pollutions.
The Supreme Court ordered:
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industries to switch to cleaner fuels like CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas).
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the automobiles should switch over to unleaded petrol in the Taj zone.
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both A and B
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none of these
Explanation
The Supreme Court ordered industries to switch to cleaner fuels like CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas). Moreover, the automobiles should switch over to unleaded petrol in the Taj zone.
Gases like methane, nitrous oxide and water vapour also contribute towards greenhouse effect, they are also called ___________.
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0%
greenhouse gases
0%
acidic gases
0%
noble gases
0%
None of these
Explanation
Gases like methane, nitrous oxide, and water vapour also contribute to the greenhouse effect, they are also called greenhouse gases.
Greenhouse gases are gases that trap heat from the sun. Without these gases, heat would escape back into space and the earth would be colder than normal temperature. Because of how they warm our planet, these gases are referred to as greenhouse gases.
Name the gas which has the highest percentage in air.
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Nitrogen
0%
Oxygen
0%
Carbon dioxide
0%
Helium
Explanation
Air consists of $$78\%$$ nitrogen, $$21\%$$ oxygen, argon, and other inert gases to the extent of about $$1.0\%$$. In addition, carbon dioxide is another important constituent of the atmosphere which varies in amount from $$0.03\%$$ to $$0.04\%$$.
Hence answer is the option A.
Which of the following is correct about the percentage composition of $$O_2$$ in air?
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0%
21%
0%
52%
0%
78%
0%
12.5%
Explanation
The air in our atmosphere is composed of molecules of different gases. The most common gases are nitrogen (78%), oxygen (about 21%), and argon (almost 1%).
Nitrogen is the major constituent of air.
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0%
True
0%
False
Explanation
Nitrogen is the major constituent of air.
It is about $$\text {78%}$$ of the total volume of air.
__________ and __________ are the major components of the atmosphere.
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0%
Nitrogen and argon
0%
Carbon dioxide and oxygen
0%
Nitrogen and oxygen
0%
Oxygen and carbon dioxide
Explanation
In the atmosphere, nitrogen is
78%, oxygen is
21%, and other gases are
1%
by volume.
Thus n
itrogen and oxygen gases are the major
components of the atmosphere. Hence option C is correct.
Greenhouse effect is mainly due to increase in the levels of:
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0%
$$O_{2}$$
0%
$$CO$$
0%
$$CO_{2}$$
0%
$$N_{2}$$
Explanation
A layer of carbon dioxide ($$CO_2$$) present in the atmosphere prevents the solar radiations (reflected by the earth's surface) from going out in the atmosphere. This heats up the earth's surface and results in the greenhouse effect.
Greenhouse effect of global warming causes:
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rise in temperature of earth
0%
rise in pressure on earth
0%
decrease in oxygen content earths atmosphere
0%
decrease in $$CO_{2}$$ content
Explanation
A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing solar radiation, thereby trapping and holding heat in the atmosphere.
The progressive heating up the surface of the earth is called the greenhouse effect or global warming. This effect increases the temperature of the earth.
Thus, the correct answer is option $$A$$.
Green house effect can be reduced by:
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growing trees and forests
0%
use of faulty refrigerators
0%
burning of fossil fuels
0%
the use of natural gas
Explanation
By growing trees and forests, we can reduce the level of carbon dioxide in the atmosphere to reduce the greenhouse effect.
The life and appearance of the historic monuments like Taj Mahal are likely to be damaged by the presence of:
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hydrocarbons
0%
excess of $$SO_{2}$$
0%
$$CFC$$
0%
$$Cl_{2}$$
Explanation
$$SO_2$$ is a suffocating and extremely pungent smelling gas. In the presence of metallic oxide or other catalysts, $$SO_2$$ reacts with oxygen of air and water vapour forming sulphuric acid ($$H_2SO_4$$) which has corrosive effect on buildings.
The life and appearance of the Taj Mahal has been brought down by the action of excess $$SO_2$$ in the atmosphere.
Excessive release of $${CO}_{2}$$ into the atmosphere results in:
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polar vortex
0%
depletion of ozone
0%
formation of smog
0%
global warming
Explanation
Carbon dioxide is very important for maintaining the climate which is suitable for our survival.
$$CO_2$$ has the property of trapping heat from the sun. So higher the level of carbon dioxide, the higher will be the heat trapped. This leads to the rise in the temperature of the earth, resulting in global warming.
Therefore, we can say excessive release of $$CO_2$$ into the atmosphere results in global warming.
Taj Mahal is being slowly disfigured and discoloured. This is primarily due to:
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water pollution.
0%
global warming.
0%
soil pollution.
0%
acid rain.
Explanation
Taj Mahal is slowly disfigured and decolored due to acid rain because the acid of water reacts with the calcium carbonate of marble.
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of the marble of the Taj Mahal.
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0%
$$CO_2$$ and $$NO_2$$
0%
$$SO_2$$ and $$NO_2$$
0%
$$O_3$$ and $$CO_2$$
0%
$$SO_2$$ and $$O_3$$
Explanation
$$\displaystyle SO_2$$ and $$\displaystyle NO_2$$ are the pollutant gases largely responsible for the discoloured and lusterless nature of the marble of the Taj Mahal. Usually $$oxides$$ of $$nitrogen$$ and $$sulphur \ $$cause acid rain which reacts with marble and cause it's dicoloration.
Option (B) is the correct answer.
Among the gases (a) - (e), the gases that cause greenhouse effect are :
(a ) CO$$_2$$
(b ) H$$_2$$O
(c ) CFCs
(d ) O$$_2$$
(e ) O$$_3$$
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$$(a), (b), (c)\ and\ (d)$$
0%
$$(a)\ and\ (d)$$
0%
$$(a), (c), (d)\ and\ (e)$$
0%
$$(a), (b), (c)\ and\ (e)$$
Explanation
Greenhouse gases cause the greenhouse effect on planets. The primary greenhouse gases in Earth's atmosphere are water vapor $$(H_2O)$$, carbon dioxide $$(CO_2)$$, methane $$(CH_4)$$, nitrous oxide $$(N_2O)$$, ozone $$(O_3)$$,
and
$$CFC's$$.
$$CO_2, O_3, H_2O$$ and $$CFCs$$ are greenhouse gases.
Hence, option $$D$$ is correct.
Nitrogen constitutes nearly __ % of the atmosphere.
Report Question
0%
45
0%
78
0%
21
0%
0.03
Explanation
The
air
in Earth's atmosphere is made up of approximately $$78$$ percent nitrogen and $$21$$ percent oxygen.
Air
also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Hence answer is $$78$$%
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