Q. Septic tanks are used for the __________ of the deposited solids.

View solution

Q. The term Biological Oxygen Demand (BOD) is used in relation to

View solution

Q. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

View solution

Q. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

View solution

Q. Which of the following processes is involved in the biochemical treatment of sewage effluents ?

View solution

Q. Infective bacteria in water is killed by the __________ process.

View solution

Q. Which of the following pollutants is absent in the emissions from a fertiliser plant ?

View solution

Q. Salt content in sea water is about __________ percent.

View solution

Q. Noise level inside a jet air liner in normal flight is about __________ decibels.

View solution

Q. What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries ?

View solution

Q. Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.

View solution

Q. Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

View solution

Q. Maximum permissible residual chlorine in treated water should be __________ mg/litre.

View solution

Q. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?

View solution

Q. Which is the most widely used coagulant for the treatment of turbid water ?

View solution

Q. Which of the following is not a natural source of air pollution ?

View solution

Q. Which of the following industries discharge mercury as a pollutant ?

View solution

Q. Threshold limit value (TLV) of CO in air is __________ ppm.

View solution

Q. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

View solution

Q. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

View solution