Class 8 Science MCQ Pollution Of Air And Water

Question : Which of the following is not a way to conserve water?
(a) Replace
(b) Reuse
(c) Reduce
(d) Recycle

Question : Which of the following is major source of water pollution?
(a) Industrial wastes
(b) Untreated sewage
(c) Use of fertilisers
(d) Toxic metals

Question : The water that is purified and fit for drinking is called
(a) Potable water
(b) Pure water
(c) Hard water
(d) Saline water

Question : Highest percentage of air consists of:
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Argon

Question :CNG is a
a) Clean fuel
b) Polluted fuel
c) Harmful fuel
d) None of the options

Question :What causes pollution
a) Human activities
b) Trees
c) Human activities and trees
d) None of the options

Question :The percentage of nitrogen is
a) 0.78
b) 0.21
c) 0.12
d) 0.87

Question :Highest percentage of air consists of
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Argon

Question : The reason for greenhouse effect is:
(a) Decrease in quantity of CO2 in atmosphere
(b) Increase in quantity of CO2 in atmosphere
(c) Decrease in quantity of oxygen in atmosphere
(d) Increase in quantity of oxygen in atmosphere

Question : Trapping of unescapable radiations of sun in Earth’s environment is called:
(a) Earth warming
(b) Greenhouse warming
(c) Greenhouse effect
(d) None of these

Question : Which Of The Following Is Not A Way To Conserve Water?
(a) Replace
(b) Reduce
(c) Reuse
(d) Recycle

Question : Heat is reflected from the earth’s surface and trapped in the atmosphere. Which phenomena is being referred to?
(a) Global warming
(b) Ozone depletion
(c) Greenhouse effect
(d) Thermal pollution

Question :Green House gas is
a) Carbon dioxide
b) Nitrogen
c) Oxygen
d) Methane

Question :Air pollution causes
a) Respiratory problems
b) Global warming
c) Soil erosion
d) None of the options

Question :Most polluted river in the world is
a) Ganga
b) Yamuna
c) Cavery
d) Chenab

Question :The Taj Mahal is being affected by
a) Air pollution
b) Noise pollution
c) Water pollution
d) None of the options

Question : The following gas is not an air pollutant:
(a) Carbon dioxide
(b) Oxides of nitrogen
(c) Sulphur dioxide
(d) Oxygen

Question : Pollution of water is responsible for
(a) Oil refineries
(b) Paper factories
(c) Sugar mills
(d) All

Question : The water that is purified and fit for drinking is called
(a) Potable water
(b) Pure water
(c) Hard water
(d) Saline water

Question : From which of the following bad effects does the ozone layer in our atmosphere protect us?
(a) Carbon dioxide
(b) CFC’s
(c) The sun’s ultraviolet rays
(d) All of the above

Question : Air pollution causes
(a) Global warming
(b) Respiratory problems
(c) Soil erosion
(d) None of these

Question : Incomplete burning of fuels produces:
(a) Carbon dioxide
(b) Carbon particles
(c) Carbon monoxide
(d) None of these

Question : One Of The Following Does Not Contribute In Producing Acid Rain. This One Is:
(a) Nitrogen dioxide
(b) Nitrogen monoxide
(c) Carbon monoxide
(d) Sulphur dioxide

Question : Most polluted river in the world is:
(a) Yamuna
(b) Cavery
(c) Chenab
(d) Ganga

Question : Most polluted river in the world is:
(a) Yamuna
(b) Cavery
(c) Chenab
(d) Ganga

Question : A poisonous gas emitted by Mathura Refinery and other industries in and around Taj which cause acid rain is:
(a) Carobon monoxide
(b) Methane
(c) Sulphur dioxide
(d) Oxygen

Question : Identify the gas associated with greenhouse effect.
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen dioxide
(d) Sulphur dioxide

Question : Instead of the fossil fuels for our energy requirements we can use :
(a) Solar energy
(b) Hydropower
(c) Wind energy
(d) All of these

Question :Water pollution is caused by the smoke given out by factories.

Question :Waste water from agricultural land do not cause water pollution.

Question :Carbon dioxide, ozone, methane and water vapour are all greenhouse gases.

Question :CNG contain sulphur which forms sulphur dioxide upon burning.

Question :CO₂ is very good to absorbing the sun’s heat.

Question :Global warming is gradual increase in the temperature of the Earth, due to excess carbon dioxide present in the atmosphere.

Question :Potable water is free from germs and impurities and is fit for drinking.

Question :There are no alternatives for fossil fuels.

Question :Infants in the same room with a smoker are exposed to indoor air pollution.

Question :Breathing in of suspended particulate matter is not as harmful as the breathing of CO₂.

Question :Algae bloom provides a rich source of oxygen for the water body that helps aquatic plants and animals.

Question :Ozone layer protects us from harmful infrared rays of the sun.

Question :Carbon monoxide reduces the oxygen – carrying capacity of the blood.

Question :It is advisable to bum dry leaves.

Question :When a forest fuel bums in insufficient amount of air, ___________________. is formed.

Question :The mixture of smoke and fog is called ___________________.

Question :Cholera is a ___________________. borne disease.

Question :CFC’s cause depletion of the ___________________. layer.

Question :Sewage should be ___________________. before releasing in water.

Question :___________________. of fuels in vehicles cause smoke.

Question :Green substance seen on the .surface of water in ponds is ___________________..

Question :Water that can be consumed by humans without concerns for adverse health effects is called ___________________. water.

Question :Two greenhouse gases are ___________________. and ___________________..

Question :Algae can be used to produce oxygen by the ___________________. process.

Question :CNG is ___________________. ___________________. ___________________.

Question :Deforestation leads to an increase in the amount of ___________________..

Question :Bacteria feeding on dead algae make water deficient in ___________________..

Question :Two clean fuels are ___________________. and ___________________..

Question :Ganga Action Plan was to reduce the ___________________. levels in the river.

Question :Substances causing pollution are called ___________________.

Question :___________________. is formed when acids fall with rain water.

Question :The major components of air are ___________________. (78%) and ___________________. (21%).

Question :LPG is ___________________. ___________________. ___________________.