A shallow pond in which the sewage is retained and biologically treated is called__________________?
A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tank
Correct Answer: Oxidation ✔
Last Updated: March 11, 2019
Related MCQs
- Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________?
- Inhalation of silica dust causes a disease called__________?
- Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________?
- Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
- Removal of __________ is accomplished by aeration of water?
- Which of the following pollutants, if present in atmosphere is detectable by its odour ?
- Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?
- Pick out the correct statement ?
- When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell?
- Which is the most practical and economical method for removal of suspended solid matter from polluted water ?
- Iron & manganese present as pollutant in water cannot be removed by__________?
- In the context of the chemical process industries, the term BOD is normally associated with the__________?
- Pick out the wrong statement pertaining to ‘green house’ for the plants ?
- Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________?
- White smoke coming out of the chimney of a furnace indicates the use of__________?
- Carbonaceous particles having size less than 1 μm are called__________?
- Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas?
- Beyond what concentration of H2S in air, acute danger to human life exists ?
- Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?
- Deaeration of high pressure boiler feed water is done to reduce __________?
- 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__________?