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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?

Ammonia
Carbon monoxide
Hydrogen
Acetylene

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Environmental Engineering in CE
Inhalation of silica dust causes a disease called

None of these
Bronchitis
Pneumoconiosis
Silicosis

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Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

1
7
82
19

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Environmental Engineering in CE
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called

Mesosphere
Troposphere
Thermosphere
Stratosphere

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Environmental Engineering in CE
Noise level in a quiet private business office is about __________ decibels.

70
50
85
25

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Environmental Engineering in CE
5-200 μm size particles are called

Dust
Colloids or aerosols
Powder
Smoke

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