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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

1.2
4.8
0.2
0.002

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Environmental Engineering in CE
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

Only (i)
(i) and (ii)
(i) and (iii)
Only (iii)

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Environmental Engineering in CE
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

None of these
Organic
Inorganic
Radioactive

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Environmental Engineering in CE
Presence of __________ in water stream are deleterious to aquatic life.

All of these
Soluble and toxic organics
Heavy metals and cynides
Suspended solids

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Acetylene
Carbon monoxide
Hydrogen
Ammonia

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Environmental Engineering in CE
Carbonaceous particles having size less than 1 μm are called

Grit
Aggregates
Smoke
Aerosols

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