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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
The resistance of water to the passage of light through it is a measure of the

Hardness
Dissolved gases
Turbidity
Color

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Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

115
90
45
10

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Environmental Engineering in CE
The pH value of potable water should be between

6.5 to 8
1 to 1.5
4 to 5
13 to 14

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Environmental Engineering in CE
Hydrogen ion concentration in distilled water is

7 x 10⁷
10⁻⁷
10⁷
7 x 10⁻⁷

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Environmental Engineering in CE
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

145
105
125
85

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