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Environmental Engineering in CE

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?

Hydrogen
Acetylene
Ammonia
Carbon monoxide

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

100
25
1000
0.1

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Powder
Grit
Smoke
Dust

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Environmental Engineering in CE
Which of the following pollutants, if present in atmosphere is detectable by its odour?

SO₂
CO₂
CO
NO₂

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Environmental Engineering in CE
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called

Smoke
Aerosols
Fumes
Mists

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Environmental Engineering in CE
Noise level inside a jet air liner in normal flight is about __________ decibels.

125
100
80
145

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