In a sedimentation tank, the detention period for water ranges from _____________ hours?

Related Mcqs:

Global warming may result in __________________?

A. Flood B. Cyclone C. Decrease in food productivity D. All A., B. and C....

Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?

A. 0.002 B. 0.2 C. 1.2 D. 4.8...

Main pollutants released from iron & steel industry is__________________?

A. CO, CO2 & SO2 B. H2S, NO & SO3 C. CO2, H2S & NO2 D. SO3, NO2 & CO2...

High noise level in a chemical plant can be controlled by the_________________?

A. Suppression of noise at the source itself B. Path control of noise C. Protection of operating personnel D. All A., B. & C....

Aerosols present in atmospheric air may be__________________?

A. Positively charged B. Negatively charged C. Neutral D. Combination of all A., B. & C....