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

Q. In large thermal power stations very fine particulates present in flue gas are removed by

View solution