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CBSE Questions for Class 8 Chemistry Pollution Of Air And Water Quiz 6 - MCQExams.com
CBSE
Class 8 Chemistry
Pollution Of Air And Water
Quiz 6
Experts have warned about Taj Mahal that:
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pollutants in air are discolouring its white marble
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pollutants in water are discolouring its white marble
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pollutants in land are discolouring its white marble
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all of the above
Explanation
Experts have warned about the Taj Mahal that pollutants in the air are discoloring its white marble. For example, suspended particulate matter such as soot particles emitted by oil refineries has contributed to the yellowing of marble.
Option $$A$$ is correct.
Earth's greenhouse effect causes:
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warmer surface temperatures
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cooler surface temperature
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there is no change in surface temperature
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None of these
Explanation
Earth's greenhouse effect causes warmer surface temperature.
A greenhouse gas (GHG) is any gas in the atmosphere that absorbs and emits radiation in the thermal infrared range. These are the fundamental cause of the greenhouse effect, which results in increased temperatures on Earth.
Which gas is produced by combustion of fuels like coal in power plants?
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$$NO_2$$
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$$CO_2$$
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$$NO$$
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$$SO_2$$
Explanation
Sulphur dioxide is produced by combustion of fuels like coal in power plants.
The Taj Mahal has become a matter of concern:
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because it is located in Agra city
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because of its bustling manufacturing center in the populous city
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because pollutants in air are discoloring its white marble
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none of these
Explanation
The Taj Mahal has become a matter of concern because pollutants in the air are discoloring its white marble. Pollutants in the air like sulphuric oxide which is produced from road traffic or from cars causes acid rain and which reacts with the white marble of Taj Mahal and due to that it's color gets change. It is the most beautiful place in India and it will be a tragedy if something bad happens to it.
Hence, option $$C$$ is correct.
Experts are worried about Taj mahal because:
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pollutants in air are discolouring its white marble
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it is not only living organisms that get affected by polluted air
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non-living things like buildings, monuments and statues also get affected
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All of the above
Explanation
Experts have warned that pollutants in the air are discolouring its white marble. So, it is not only living organisms that get affected by polluted air but non-living things like buildings, monuments and statues also get affected.
Deforestation leads to an increase in the amount of $$CO_2$$ in the air:
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because the number of trees which consume $$CO_2$$ is increased
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because the number of trees which consume $$CO_2$$ is reduced
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because the number of trees which
consume more
$$O_2$$
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None of the above
Explanation
Deforestation leads to an increase in the amount of $$CO_2$$ in the air because the number of trees which consume $$CO_2$$ is reduced.
Which of the following gas is responsible for green house effect?
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$$CO_2$$
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$$H_2S$$
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$$N_2$$
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None of the above
Explanation
Excess of $$CO_2$$ is responsible for the greenhouse effect.
$$CO_2$$
traps heat and does not allow it to escape into space. As a result, the average temperature of the earth’s atmosphere is gradually increasing. This is called global warming.
The radiation from the sun is trapped by the earth's atmosphere. This effect is called:
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greenhouse effect
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nursery effect
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trapping effect
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None of the above
Explanation
The radiation from the sun is trapped by gases in the earth's atmosphere. This effect is similar to how heat is trapped in greenhouses where plants are kept. So, the effect is called greenhouse effect.
Acid rain corrodes the marble of the monument. The phenomenon is also called:
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destruction
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marble cancer
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corrosion
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rusting
Explanation
Acid rain corrodes the marble of the monument. The phenomenon is also called Marble cancer.
Which of the following is an agreement signed by many countries to reduce the emission of greenhouse gases?
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Kroto protocol
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Kyoto protocol
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Kramer protocol
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Krato protocol
Explanation
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
The average temperature of the earth's atmosphere is gradually increasing. This is due to:
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global warming
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global housing
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sea water
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none of the above
Explanation
The average temperature of the earth's atmosphere is gradually increasing. This is due to global warming.
An increase in greenhouse gases like carbon dioxide, methane, water vapor, etc. increases the earth's temperature this effect is called global warming
Option $$A$$ is correct.
The Kyoto Protocol is an:
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agreement to reduce the emission of greenhouse gases
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disagreement to reduce the emission of greenhouse gases
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agreement to increase the emission of greenhouse gases
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agreement to reduce the emission of greenhouse liquids
Explanation
The Kyoto Protocol is an international agreement that aimed to reduce carbon dioxide emissions and the presence of greenhouse gases (GHG) in the atmosphere. The essential tenet of the Kyoto Protocol was that industrialized nations needed to lessen the amount of their greenhouse gas emissions.
A popular household filter is __________ filter.
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smoke
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water
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candle type
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none of the above
Explanation
A popular household filter is a candle type filter
that is used to purify the water at home.
The excess fertilizers not consumed by crops are washed away from land by rain and pollute _____.
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water
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air
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noise
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soil
Explanation
The excess fertilizers not consumed by crops are washed away from the land by rain and pollute water. These fertilizers are chemical compounds that harm aquatic plants and animals. They also degrade the quality of water. Hence option A is correct.
Who treats the water before supplying it to households?
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Municipal body
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Railway body
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Healthcare body
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None of the above
Explanation
Municipal bodies treat the water before supplying it to households.
Hence the correct option is $$A$$.
Majority of regions which are threatened by global warming are present in ______.
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Asia
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Africa
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Europe
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Australia
Water pollution is caused by :
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sewage
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domestic waste
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food processing plant
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All of the above
Explanation
Water pollution is defined as contamination of water bodies usually as a result of human activities. It degrades the water quality and makes it unsuitable for drinking. All the above options are responsible for water pollution.
The most significant sources of water pollution:
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waste water from domestic and industrial processes
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agricultural pollution
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oil pollution
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all of the above
Explanation
The most significant sources of water pollution are wastewater( sewage), agricultural pollution, Oil pollution, radioactive substances, water body dumping.
Oil spills reduce _________ supplies within the water environment.
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carbon dioxide
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oxygen
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nitrogen
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none of these
Explanation
Oil spills reduce $$\text {oxygen}$$ supplies within the water environment.
_________ is the man-made cause of deforestation.
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Urbanization
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Forest Fire
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Droughts
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All of the above
Explanation
Urbanization is the man-made cause of deforestation. Whereas forest fires and droughts are natural causes of deforestation.
Urbanization is due to the increased population. It is caused due to human activities. Urbanization decreases the area under forests which leads to a reduction in the number of forest trees.
Greenhouse gas among the following is/are:
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Carbon dioxide
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Nitrous oxide
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Methane
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all of the above
Explanation
All the gases mention in the option i.e Carbon dioxide, nitrous oxide, and methane trap the solar radiation coming from the sun and radiate energy back to the surface of the earth causing the increase in temperature. This is called global warming and these gases are called greenhouse gases.
Hence, option $$D$$ is correct.
Which of the following natural phenomenons releases chemicals which cause acid rains?
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Volcanic eruptions
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Lightning
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Rotting vegetation
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All
Explanation
All the above phenomenons release sulphur and nitrogen oxides which causes acid rains.
Volcanic eruptions have fumes that contain sulfur oxides.
Lightning bolts are a natural source of nitrogen oxides. The very high temperature in the vicinity of a lightning bolt causes the gases oxygen and nitrogen in the air to react to form nitric oxide.
Rotten vegetation also releases sulfur oxides and carbon oxides, which are acidic in nature.
Hence, all options are correct.
Which river sustains most of the northern, central and eastern Indian population?
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Sabarmati
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Narmada
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Ganga
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Yamuna
Explanation
Ganga sustains most of the northern, central and eastern Indian population. Millions of people depend on it for their daily needs and livelihood.
Which organization found that Ganga is one of the ten most endangered rivers in the world?
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WWE
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WWF
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WWW
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PETA
Explanation
World Wide Fund for Nature (WWF) found that Ganga is one of the ten most endangered rivers in the world, as it is highly polluted and needs to be cleaned urgently. They also mentioned that
river is ‘dead’ at many places where the pollution levels are so high that aquatic life cannot survive.
What makes the normal rain water acidic?
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Presence of dust particles in air
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Presence of $$CO_2$$ in atmosphere
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Presence of ozone in atmosphere
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None of the above
Explanation
$$CO_2$$ in the air dissolves in water to form carbonic acid. This makes normal rain water slightly acidic.
______ is a commonly used chemical method for purifying water.
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Chlorination
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Flourination
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Bromination
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Boiling
Explanation
Chlorination is a commonly used chemical method for purifying water. It kills germs in the water.
What are the factors responsible for pollution of the river?
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Defecating in the river
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Throwing garbage, flowers, idols of gods into river
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Industrial units discharging toxic chemical wastes into the river
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All of the above
Explanation
All of the given options add harmful chemicals and toxins to the water, making it unfit for the habitation of aquatic animals, or use by human beings.
Hence, the correct option is D.
Which is not the green house gas among the following?
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Chlorofluorocarbons
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Argon
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Water vapour
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Carbon-dioxide
Explanation
Greenhouse gas is the gas that has the property of absorbing infrared radiation emitted from Earth's surface and reflecting it back to Earth's surface, thus contributing to the greenhouse effect.
Carbon dioxide, methane, nitrous oxide, and water vapour are the most important greenhouse gases.
Argon is not a greenhouse gas because it allows the sunlight rays to pass through them which further does not promote the rise in temperature of the earth.
Option $$B$$ is correct.
Acid rain:
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reduces fertility of soil
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affects vegetation
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damages marble monuments
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All of these
Explanation
Acid rain is very harmful as it reduces the fertility of soil, affects vegetation and can inflicts damages on many structures and monuments.
What is the main source of global warming?
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$$SO_2$$
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$$CO_2$$
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$$H_2SO_4$$
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$$N_2O$$
Explanation
The main source of global warming is carbon dioxide. It causes global warming by trapping heat.
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