Question: Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the [A]. gravity settling chamber [B]. cyclone separator [C]. electrostatic precipitator [D]. bag filter Answer: Option C Explanation: No…

Question: Dust collection efficiency of a cyclone separator depends upon its [A]. diameter. [B]. inlet gas velocity. [C]. overall height. [D]. all (a), (b) & (c). Answer: Option D Explanation: No answer description available for this question.

Question: 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 [A]. paralysis of muscles & loss of appetite. [B]. nervous depression. [C]. gastritis & diarrhea.…

Question: Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes [A]. fading of dyes on textiles. [B]. corrosion, tarnishing & soiling of metals. [C]. reduced strength of textiles. [D]. all (a), (b) and…

Question: Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air. [A]. hydrocarbons [B]. hydrogen flouride [C]. hydrogen sulphides [D]. nitrogen dioxide Answer: Option B Explanation: No answer description available for this question.

Question: Persons working in cement plants and limestone quarries are more prone to disease like [A]. cancer [B]. asthma [C]. silicosis [D]. flourosis (bone disease) Answer: Option C Explanation: No answer description available for this question.

Question: ‘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 [A]. industrial chimney exhaust. [B]. automobiles exhaust. [C]. photochemical reaction in…

Question: ‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a ‘particulate’ ? [A]. Dust & mists [B]. Smoke & fumes [C]. Photochemical smog & soot [D]. None of these Answer: Option D Explanation:…

Question: Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called [A]. fumes [B]. mists [C]. smoke [D]. aerosols Answer: Option D Explanation: No answer description available for this question.

Question: Ozone is [A]. a primary pollutant. [B]. a secondary pollutant. [C]. impervious to ultra-violet rays. [D]. both (b) and (c) Answer: Option D Explanation: No answer description available for this question.