Q. No.A substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource is called:
| 1. | Pathogen | 2. | Allergen |
| 3. | Pollutant | 4. | Secondary metabolite |
The Environment [protection] Act to protect and improve the quality of our environment [Air, Water and Soil] was passed by the Government of India in:
| 1. | 1974 | 2. | 1981 |
| 3. | 1986 | 4. | 1988 |
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. |
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. |
The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator
2. cyclonic separator
3. trajectory separator
4. scrubber
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
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
| 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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