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Environmental Engineering in CE

Environmental Engineering in CE
__________ is the process of killing organism in water.

Coagulation
Sterilisation
Disinfection
Sedimentation

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Environmental Engineering in CE
Presence of __________ hardness is responsible for the temporary hardness in water.

Choride
Calcium
Carbonate
Sulphate

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Environmental Engineering in CE
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

Benzene hexachloride
Alkalis
Chlorine
Alkyl benzene sulphonate (ABS)

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Environmental Engineering in CE
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes

Respiratory disease (e.g., asthma)
Silicosis
Reduced crop yield
Cancer

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Environmental Engineering in CE
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

Digestion
Both B and C
Filtration
Sedimentation

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Environmental Engineering in CE
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Settling out using chemical reagents
Skimming off
Chlorination
Biological oxidation

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