A. Files
B. Algae
C. Micro-organisms
D. Mosquitoes
Correct Answer: Micro-organisms ✔
Last Updated: March 11, 2019
Related MCQs
- The pH value of oxidised sewage is about__________?
- Arsenic pollutant is not generated in __________ industries?
- Pollution by particulate matter emission in the atmosphere does not take place during metal__________?
- Main pollutant present in automobile exhaust is__________?
- Scale formation in boiler is controlled by__________?
- Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels?
- Presence of bacteria in potable (drinking) water causes__________?
- TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm?
- Radioactive substances present in the polluted water stream can be removed by__________?
- H2S present in gaseous stream can be removed by adsorption on __________?
- Maximum permissible turbidity in potable water is __________ ppm?
- Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________?
- Higher concentration of CO2 in atmosphere__________?
- Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
- 80% less than 200 mesh size particles are called__________?
- High noise level in a chemical plant can be controlled by the__________?
- World’s worst radioactive pollution was caused by nuclear reactor disaster which occured in __________?
- Exposure to chemicals having carcinogenic properties cause __________?
- Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels?
- COD of raw municipal sewage may be in the range of about __________ mg/litre?
- ‘Pneumoconiosis’ is a disease caused by the inhalation of __________ dust?
- A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm?
- Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels?
- Siderosis is a disease caused by the inhalation of __________ dust?
- Lagooning process is mainly a means of the__________?
- Peroxyacetyl nitrate (PAN), a pollutant is found in the__________?
- . Operating principle of cyclone separator is based on the action of __________ dust particles?
- Green house effect is accentuated by__________?
- Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause__________?
- The widest explosive limit is of __________, thereby making it the most explosive gas?
- Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for__________?
- Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels?
- Smoke is produced due to__________?
- World environment day is observed every year on the 5th of__________?
- Foul odour and bad taste of water is removed by treating with__________?
- Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water__________?
- Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent__________?
- Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in__________?
- TLV of mercury in potable (drinking) water is about __________ ppm?
- Presence of iron and manganese in water causes__________?
- Presence of soluble organics in polluted water causes__________?
- 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__________?