Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
None of these
Ozone
Carbon dioxide

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Environmental Engineering in CE
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

Inversely proportional to viscosity of gas
Proportional to the viscosity & density of the gas
Proportional to the pressure of the gas
Both B and C

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