Q. The common pollutant generated in chlor-alkali industry and battery manufacture is

View solution

Q. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.

View solution

Q. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

View solution

Q. Pick out the wrong statement.

View solution

Q. __________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.

View solution

Q. 'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

View solution

Q. Inhalation of silica dust by human being causes

View solution

Q. Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage ?

View solution

Q. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

View solution

Q. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

View solution

Q. Insufficient washing of sand grains in a rapid sand filter causes

View solution

Q. Which of the following sources is responsible for maximum air pollution ?

View solution

Q. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?

View solution

Q. In sewage treatment, its sedimentation is speeded up by commonly adding

View solution

Q. Noise level in a quiet private business office is about __________ decibels.

View solution

Q. White smoke coming out of the chimney of a furnace indicates the use of

View solution

Q. TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

View solution

Q. Sulphur dioxide present in the industrial chimney exhaust gases causes

View solution

Q. A man exposed to excessive noise level in the working environment may suffer from

View solution

Q. Which of the following is a secondary air pollutant ?

View solution