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
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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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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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A water body has low DO content. An organism that is likely to flourish here will be:
1. Gonyaulax, an annelid
2. Gonyaulax, a nematode
3. Tubifex, an annelid
4. Tubifex, a nematode
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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Identify the incorrectly matched pair with respect to contamination of water:
1. Minamata disease: Mercury
2. Blue bay syndrome: excessive nitrates
3. Black foot disease: excessive arsenic
4. Dental caries: excessive fluoride
A painful bone condition is produced when the drinking water is contaminated with:
1. Lead
2. Mercury
3. Cadmium
4. Arsenic
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Combustion of solid wastes in the absence of oxygen is known as:
| 1. | Incineration | 2. | Pyrolysis |
| 3. | Anaerobiosis | 4. | Burning |
The intensity of noise beyond which physical discomfort is:
1. 70 dB
2. 80 dB
3. 100 dB
4. 120 dB
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The CPCB has recommended zone-wise ambient noise levels. The limit during the day in residential areas is:
1. 75 dB
2. 65 dB
3. 55 dB
4. 50 dB
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