Environmental Engineering in CE
High noise level in a chemical plant can be controlled by the

Path control of noise
Protection of operating personnel
Suppression of noise at the source itself
All of these

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Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

Allows visible solar radiation (ultraviolet) of short wave-length to pass through
All of these
Reflects and absorbs the longer wavelength (infra-red) radiations
Prevents solar heat being radiated out completely, resulting in

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