CBSE Class 8 Science Pollution of Air and Water MCQs

Chapter 18 POLLUTION OF AIR AND WATER

Question: Chlorofluorocarbon is used in
a) All
b) Refrigerators
c) Air conditioners
d) Perfumes

Answer: A

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

Answer: A

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

Answer: A

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

Answer: A

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

Answer: A

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

Answer: B

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

Answer: A

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

Answer: A

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

Answer: C

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

Answer: A

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

Answer : B

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

Answer : C

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

Answer : A

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

Answer : C

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

Answer : D

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

Answer : B

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

Answer : C

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

Answer : C

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

Answer : D

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

Answer : D

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

Answer : C

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

Answer : D

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

Answer : A

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

Answer: C

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

Answer : A

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

Answer : D

Question. Carbon monoxide in vehicle exhaust causes
a) Increased oxygen carrying capacity of RBCs
b) Reduced Nitrogen carrying capacity of RBCs
c) Reduced oxygen carrying capacity of RBCs
d) Reduced carbon carrying capacity of RBCs

Question. Smog =
a) Smoke in dog’s stomach
b) Smoke + fog
c) Smoke dog
d) frog in fog

Question. The gas used in refrigerating appliance causing serious damage to ozone is
a) MFCs
b) CFCs
c) LPCs
d) DPCs

Question.  Acid rain mainly contains
a) Sodium chloride
b) Sulphur di oxide and Nitrogen di oxide
c) Hydrochloric acid
d) Carbon tetra chloride

Question.  Marble cancer is caused by
a) bacteria
b) virus
c) Acid rain
d) Alkali rain

Question. Greenhouse effect is
a) Painting house green in colour
b) Wearing green colour dress
c) Having green room in the house
d) Sun’s heat is trapped and not allowed to escape

Question. Greenhouse gases includes
a) CO₂, Methane, Nitrous oxide
b) CO₂, Argon, Nitrous oxide
c) CO₂, Methane, Chlorine
d) CO₂, Methane, Flourine

Question.  _____ is a commonly used chemical method for purifying water.
a) Brominization
b) Flourination
c) Filtration
d) Chlorination

Question.  Ganga Action Plan is associated with
a) Increase of fish culture in the Ganges
b) Reduce Ganga water pollution
c) Construct more bridges over the Ganges
d) Increase water transport on the Ganges

Question.  Van Mahotsav is
a) Planting trees in January
b) Cutting trees in January
c) Cutting trees in July
d) Planting trees in July