Q. No.The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator
2. cyclonic separator
3. trajectory separator
4. scrubber
1. electrostatic precipitator
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
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
In an algal bloom, the cause of death of other algae is usually:
1. toxins
2. decreased DO
3. decreased sunlight
4. decreased nutrients
Combustion of solid wastes in the absence of oxygen is known as:
| 1. | Incineration | 2. | Pyrolysis |
| 3. | Anaerobiosis | 4. | Burning |
Radiatively active gases do not include:
1. Methane
2. Ammonia
3. Nitrous oxide
4. Chloroflouro carbons
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 |
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. |
Hot wastewater discharged from industries into water bodies:
| 1. | increases the nutrient content of the water body |
| 2. | decreases the BOD of water |
| 3. | is considered a water pollutant |
| 4. | is desirable as cool water is more damaging to aquatic life |
Biomagnification can occur as a result of:
| I: | Persistence |
| II: | Food chain energetics |
| III: | Low or non-existent rate of internal degradation or excretion of the substance |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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