8th Grade > Chemistry
POLLUTION OF AIR AND WATER MCQs
Total Questions : 51
| Page 2 of 6 pages
Answer: Option A. -> CO
:
A
Carbon monoxide is a colourless, odorless, tasteless, non-irritating and toxic gas formed by incomplete combustion of organic matter. It mainly causes adverse effects by combining withhaemoglobinto form 'carboxyhaemoglobin' in the blood. This prevents haemoglobin from carrying oxygen to the tissues, leading to asphyxiation (choking and shortness of breath). In extreme conditions, it can also cause death.
:
A
Carbon monoxide is a colourless, odorless, tasteless, non-irritating and toxic gas formed by incomplete combustion of organic matter. It mainly causes adverse effects by combining withhaemoglobinto form 'carboxyhaemoglobin' in the blood. This prevents haemoglobin from carrying oxygen to the tissues, leading to asphyxiation (choking and shortness of breath). In extreme conditions, it can also cause death.
Answer: Option B. -> Smog
:
B
During winters, a thick fog-like layer is seen in the atmosphere especially in developing cities. This is called smog which is made up of smoke and fog. Smoke may contain oxides of sulphur and nitrogen which combine with other air pollutants and fog to form smog. Smog causes breathing difficulties such as asthma, coughand wheezing.
:
B
During winters, a thick fog-like layer is seen in the atmosphere especially in developing cities. This is called smog which is made up of smoke and fog. Smoke may contain oxides of sulphur and nitrogen which combine with other air pollutants and fog to form smog. Smog causes breathing difficulties such as asthma, coughand wheezing.
Answer: Option D. -> Chlorofluorocarbons
:
D
Chlorofluorocarbons (CFCs) which are used in refrigerators, air conditioners and aerosol sprays are considered as pollutants. When CFCsescapeinto theatmosphere, they convertozone(O3) to oxygen molecules(O2)and thus reducethe thickness of the ozone layer, which protects the Earth from the UV rays of the Sun.
:
D
Chlorofluorocarbons (CFCs) which are used in refrigerators, air conditioners and aerosol sprays are considered as pollutants. When CFCsescapeinto theatmosphere, they convertozone(O3) to oxygen molecules(O2)and thus reducethe thickness of the ozone layer, which protects the Earth from the UV rays of the Sun.
Answer: Option A. -> Hydrogen sulfide, H2S
:
A
Hydrogen sulfide is achemical compound with the formula H2S. It is a colorless gas with the characteristic foul odour of rotten eggs. It is heavier than air, verypoisonous, corrosive, flammable, and explosive.
:
A
Hydrogen sulfide is achemical compound with the formula H2S. It is a colorless gas with the characteristic foul odour of rotten eggs. It is heavier than air, verypoisonous, corrosive, flammable, and explosive.
Answer: Option C. -> CNG
:
C
The fuels which leave alesser amount of toxic substances and undesirable harmful exhausts after combustion are cleaner fuels.
Natural gas is lighter than air and disperses quickly when released. Therefore CNG is a cleaner vehicle fuel than kerosene, petrol and diesel and it is also safer than other fuels.
:
C
The fuels which leave alesser amount of toxic substances and undesirable harmful exhausts after combustion are cleaner fuels.
Natural gas is lighter than air and disperses quickly when released. Therefore CNG is a cleaner vehicle fuel than kerosene, petrol and diesel and it is also safer than other fuels.
Answer: Option A. -> carbon dioxide
:
A
Global warming is caused by green house gases like carbon dioxide, water vapour, methane etc. Global warming is the steady rise of the Earth's average temperature.
:
A
Global warming is caused by green house gases like carbon dioxide, water vapour, methane etc. Global warming is the steady rise of the Earth's average temperature.
Answer: Option A. -> Reverse Osmosis (RO)
:
A
Reverse osmosis often referred to as RO, is an advanced water purification method that was initially developed to produce drinking water from seawater for submarine crews.Modern reverse osmosis unitseffectively reduce the “dissolved solids” content of water.It is a membrane filtration technology that works by pressing water through the very tiny pores of a semi-permeable membrane to produce a highly purified and great tasting water.
:
A
Reverse osmosis often referred to as RO, is an advanced water purification method that was initially developed to produce drinking water from seawater for submarine crews.Modern reverse osmosis unitseffectively reduce the “dissolved solids” content of water.It is a membrane filtration technology that works by pressing water through the very tiny pores of a semi-permeable membrane to produce a highly purified and great tasting water.
Answer: Option A. -> True
:
A
Leaded petrol upon combustion emits more harmful gases into the atmosphere which contains lead as one of their constituents.
It contaminates air, dust, soil, drinking water and food crops. The excessive exposure to lead may cause a permanent loss of intelligence and disruption of behaviour. So, it is important to avoid this and use unleaded petrol.
:
A
Leaded petrol upon combustion emits more harmful gases into the atmosphere which contains lead as one of their constituents.
It contaminates air, dust, soil, drinking water and food crops. The excessive exposure to lead may cause a permanent loss of intelligence and disruption of behaviour. So, it is important to avoid this and use unleaded petrol.
Answer: Option C. -> potable
:
C
Water from natural bodies can contain micro-organisms that can causediseases. So, it is essential to purify water before drinking. Water which is suitable for drinking is called potable water. Potable water has been filtered, cleaned, or treated to meet the standards fordrinking water, meaning that it is reasonably clear of contaminants and harmful bacteria. This makes thewatersafe fordrinkingand cooking.
:
C
Water from natural bodies can contain micro-organisms that can causediseases. So, it is essential to purify water before drinking. Water which is suitable for drinking is called potable water. Potable water has been filtered, cleaned, or treated to meet the standards fordrinking water, meaning that it is reasonably clear of contaminants and harmful bacteria. This makes thewatersafe fordrinkingand cooking.
Answer: Option A. -> True
:
A
Non-metal oxides react with water to form acids. Nitrogen dioxide which is a non metallic oxide reacts with water to form nitric acid.
:
A
Non-metal oxides react with water to form acids. Nitrogen dioxide which is a non metallic oxide reacts with water to form nitric acid.
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