A. Foaming from boilers
B. Its dissolved oxygen content
C. Its silica content
D. Caustic embrittlement
Correct Answer: Its dissolved oxygen content ✔
Last Updated: March 11, 2019
Related MCQs
- The common pollutant generated in chlor-alkali industry and battery manufacture is __________?
- Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm)?
- The Killer gas which caused Bhopal gas tragedy in 1984 was__________?
- Which of the following industries discharge mercury as a pollutant ?
- The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water?
- Which of the following is the most lethal water pollutant ?
- In large thermal power stations very fine particulates present in flue gas are removed by__________?
- Presence of __________ bacteria in water causes disease like typhoid?
- As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m3.(μg-microgram)?
- Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million)?
- Out of the following, TLV of __________ is maximum (about 500 ppm)?
- Fine grit present in sewage is removed in the __________ during sewage treatment?
- Corrosion in boilers can be prevented by __________?
- Sulphur dioxide present in the industrial chimney exhaust gases causes__________?
- Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?
- The pH value of potable water should be between__________?
- Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
- Biological oxidation ponds remove organic matters present in the polluted water by __________?
- Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace?
- Presence of nitrates in water in excess of 50 ppm causes__________?
- Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
- Pick out the wrong statement ?
- Ethanolamine is an absorbent used for the removal of __________ from air/gas?
- Threshold limit value (TLV) of CO in air is __________ ppm?
- There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km?
- Which of the following is the most widely used disinfectant in water treatment ?
- Which of the following is not a natural source of air pollution ?
- Removal of __________ results from the disinfection of water?
- A standard test for determination of hardness in water is termed as __________ test?
- The function of skimming tank in sewage treatment is to remove __________ substances?
- Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of__________?
- Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?
- Which of the following is a manmade source of air pollution ?
- Workers working in __________ industry are most prone to white lung cancer?
- The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel ?
- __________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
- Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by __________?
- Ringelmann chart No. 2 corresponds to __________ percent black smoke?
- Global warming may result in __________?
- 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__________?
- Which of the following is not a practical method of low level radioactive waste disposal ?
- The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the __________?
- Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
- Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?
- High noise levels produced during operation of fans and compressors can be reduced by using__________?
- Salt content in sea water is about __________ percent?
- __________ is the process of killing organism in water ?
- Fresh sewage is __________ in nature?
- From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm?
- Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre?
- Which of the following fine dust removal equipments is the most efficient ?