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

Q. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

View solution

Q. Photochemical smog is formed from automobile exhaust

View solution

Q. Reinglemann chart is used for the measurement of the

View solution

Q. Disinfection of water is done to remove

View solution

Q. Which of the following fine dust removal equipments is the most efficient ?

View solution

Q. The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

View solution

Q. Inorganic impurities causing water pollution is

View solution

Q. The main type of sludge gas evolved during sewage treatment in Imhoff tank is

View solution

Q. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

View solution

Q. The pH value of oxidised sewage is about

View solution

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

View solution

Q. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

View solution

Q. Biological oxidation ponds remove organic matters present in the polluted water by

View solution

Q. Which of the following is an adsorbant for removal of nitrogen oxides from gas/air ?

View solution

Q. Out of the following, TLV of __________ is the minimum (about 0.02 ppm).

View solution