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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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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In an algal bloom, the cause of death of other algae is usually:
1. toxins
2. decreased DO
3. decreased sunlight
4. decreased nutrients
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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
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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 |
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 |
Arcata Wildlife Sanctuary in Arcata, California is also a/an:
1. innovative sewer management system
2. tiger reserve
3. nuclear waste disposal site
4. ecological hotspot