8th Grade > Chemistry
POLLUTION OF AIR AND WATER MCQs
Total Questions : 51
| Page 1 of 6 pages
Answer: Option C. -> free of impurities
:
C
Pure drinking water is free of physical, chemical and biological impurities. Water which looks clear without any smell can still contain disease-causing micro-organisms. Boiling is a method to obtain safe drinking water at home.
:
C
Pure drinking water is free of physical, chemical and biological impurities. Water which looks clear without any smell can still contain disease-causing micro-organisms. Boiling is a method to obtain safe drinking water at home.
Answer: Option A. -> True
:
A
Dry cleaning and regular laundering are two different processes. Dry-cleaning does not use water while laundering does. In dry cleaning,chemical solvents are used to get rid of hard stains like pen ink. Most solvents used are extremely toxic. Clothes after dry cleaning release corrosive acidic fumesthat can damage the lungs. Hence, we should air our newly dry-cleaned clothes to minimise contact with these harmful fumes.
:
A
Dry cleaning and regular laundering are two different processes. Dry-cleaning does not use water while laundering does. In dry cleaning,chemical solvents are used to get rid of hard stains like pen ink. Most solvents used are extremely toxic. Clothes after dry cleaning release corrosive acidic fumesthat can damage the lungs. Hence, we should air our newly dry-cleaned clothes to minimise contact with these harmful fumes.
Answer: Option B. -> environmental pollution
:
B
Any unfavorable alteration of the environment may be called asenvironmental pollution.
:
B
Any unfavorable alteration of the environment may be called asenvironmental pollution.
Answer: Option D. -> Air
:
D
An average human can sustain without food for more than 20 days, without water for 3-4 days and without air for 3 minutes.
So lack of air can kill us faster.
:
D
An average human can sustain without food for more than 20 days, without water for 3-4 days and without air for 3 minutes.
So lack of air can kill us faster.
Answer: Option C. -> Automobiles
:
C
Carbon monoxide(CO) is a poisonous gas. The incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood leads to the formation of CO. Out of the given options, automobiles are the source of carbon monoxide (CO) production.
:
C
Carbon monoxide(CO) is a poisonous gas. The incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood leads to the formation of CO. Out of the given options, automobiles are the source of carbon monoxide (CO) production.
Answer: Option B. -> False
:
B
Sewage water and industrial waste water contain alot of chemicals, unused materials, and harmful microorganisms, and should not be directly disposed of into the rivers and lakes because they cause water pollution and contamination which is a threat to aquatic life. They should be first treated before dumping into these places.
:
B
Sewage water and industrial waste water contain alot of chemicals, unused materials, and harmful microorganisms, and should not be directly disposed of into the rivers and lakes because they cause water pollution and contamination which is a threat to aquatic life. They should be first treated before dumping into these places.
Answer: Option B. -> ultraviolet
:
B
The ozone layer is a region of the earth's stratospherewhich absorbs the maximum ultraviolet radiations of the sun.The ozone layer protects life on earth by acting as a shield against ultraviolet rays. Ultraviolet radiation from the sun gets absorbedby the ozone layerkeeping much of those harmful rays away from the organisms on the earth.
:
B
The ozone layer is a region of the earth's stratospherewhich absorbs the maximum ultraviolet radiations of the sun.The ozone layer protects life on earth by acting as a shield against ultraviolet rays. Ultraviolet radiation from the sun gets absorbedby the ozone layerkeeping much of those harmful rays away from the organisms on the earth.
Answer: Option D. -> Dirt
:
D
Filtration is a physical method to remove impurities. Some dissolved salts and minerals remain in water even after filtration. This is because salts, germs, minerals and some other substances can pass through afilter paper or filtering candle.
:
D
Filtration is a physical method to remove impurities. Some dissolved salts and minerals remain in water even after filtration. This is because salts, germs, minerals and some other substances can pass through afilter paper or filtering candle.
Answer: Option B. -> Eutrophication
:
B
The image depicts an eutrophic lake with algal blooms. Eutrophication is a process by which lakes or other water bodies become rich in nitrogenous nutrients due to excess run-off of fertilizers and animal wastes into them. Excessive nitrogen allows plant life (algae) to grow luxuriantly causing algal blooms. This cuts off oxygen supply to the residing fishes and other aquatic organisms.
:
B
The image depicts an eutrophic lake with algal blooms. Eutrophication is a process by which lakes or other water bodies become rich in nitrogenous nutrients due to excess run-off of fertilizers and animal wastes into them. Excessive nitrogen allows plant life (algae) to grow luxuriantly causing algal blooms. This cuts off oxygen supply to the residing fishes and other aquatic organisms.
Answer: Option B. -> air pollution
:
B
Air pollution is the phenomenon in which air is contaminated by unwanted substances. These contaminants have harmful effects on both living and non-living things.
Examples: Air pollution is caused by CO (carbon monoxide), oxides of sulphur etc.
CO reduces the lung capacity in humans while oxides of sulphur causes respiratory problems in humans and causes damage to buildings.
:
B
Air pollution is the phenomenon in which air is contaminated by unwanted substances. These contaminants have harmful effects on both living and non-living things.
Examples: Air pollution is caused by CO (carbon monoxide), oxides of sulphur etc.
CO reduces the lung capacity in humans while oxides of sulphur causes respiratory problems in humans and causes damage to buildings.
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