A. Undesirable plants growth
B. Depletion of oxygen
C. Fire hazards
D. Explosion hazards
Correct Answer: Depletion of oxygen ✔
Last Updated: March 11, 2019
Related MCQs
- Persons working in cement plants and limestone quarries are more prone to disease like__________?
- The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________?
- In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?
- Which of the following is the most severe air pollutant ?
- Dust collection efficiency of a cyclone separator depends upon its__________?
- The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is__________?
- Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan__________?
- Main pollutants released from iron & steel industry is__________?
- A shallow pond in which the sewage is retained and biologically treated is called__________?
- 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 ?