Q. No.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. |
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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. |
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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
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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
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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
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| 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. |
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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
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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
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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 |
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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
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