Identify the incorrect statement regarding primary air pollutants:

1.  Carbon monoxide is a product of incomplete combustion of fossil fuels.
2.  Methane is the most abundant hydrocarbon in the atmosphere
3.  A high concentration of sulphur dioxide causes severe respiratory problems
4.  Particulate matter less than 1 micrometer in diameter generally settle out in less than a day.

Subtopic:  Air Pollution |
 73%
From NCERT
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The following diagram shows the working of an electrostatic precipitator. Identify the correct statement:
    

1.  A negative voltage ionizes the air around the wire that in turn ionizes the particles in the air stream.
2.  They are able to remove about 75% of the particulate matter present in the exhaust from a thermal power plant.
3.  The velocity of air between the plates must be rapid enough to allow electrostatic precipitation of the dust particles.
4.  PM 2.5 dust particles are more easily removed by the electrostatic precipitator than larger sized particulate matter.
Subtopic:  Air Pollution |
 62%
From NCERT
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The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator

2. cyclonic separator

3. trajectory separator

4. scrubber

Subtopic:  Air Pollution |
 91%
From NCERT
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The device, normally used to remove gaseous pollutants from polluted air but can remove large particulate matter as well, is:
1. electrostatic precipitator

2. cyclonic separator

3. trajectory separator

4. Scrubber

Subtopic:  Air Pollution |
 54%
From NCERT
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According to CPCB, what particulate size is most harmful to humans:
1. more than 10 micrometers
2. between 5 to 10 micrometers
3. between 2.5 and 5 micrometers
4. less than 2.5 micrometers

Subtopic:  Air Pollution |
 88%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  According to CPCB, particulate size 2.5 micrometer or less in diameter [PM 2.5] are responsible for causing the greatest harm to human health.
Reason (R):  These fine particles can be inhaled deep into the lungs and can damage lungs.
 In the light of the above statements, choose the most appropriate answer from the options given below:
1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.
  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Air Pollution |
 90%
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Modern catalytic converters in automobiles are capable of:

I:  Oxidation of carbon, hydrocarbons, and carbon monoxide to carbon dioxide
II:  Oxidation of nitrogen oxides to nitrogen (N2)

1. Only I
2. Only II
3. Both I and II
4. Neither I nor II

Subtopic:  Air Pollution |
From NCERT
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Catalytic Converters:

I:  use expensive metals like Gold & Tungsten as catalysts
II:  convert unburnt hydrocarbons to CO2 and H2O, CO to CO2 and NO to N2
III:  are deactivated by Lead

1. only I & II are correct
2. only I & III are correct
3. Only II & III are correct
4. I, II & III are correct

Subtopic:  Air Pollution |
 67%
From NCERT
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It is necessary to remove sulphur from petroleum products to

1.  reduce the emission of sulphur dioxide in exhaust fumes
2.  increase efficiency of automobiles' engines
3.  use sulphur removed from petroleum for commercial purposes
4.  increase the life span of engine silencers
Subtopic:  Air Pollution |
 77%
From NCERT
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What was added in 1987 as a pollutant to The Air (Prevention and Control of Pollution) Act, [originally passed in 1981]?
1. radioactive wastes
2. CFCs
3. ground level ozone
4. noise

Subtopic:  Air Pollution |
 88%
From NCERT
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