80% less than 200 mesh size particles are called
80% less than 200 mesh size particles are called
Pick out the correct statement.
Pick out the correct statement.
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.
Which of the following industries discharge mercury as a pollutant?
Which of the following industries discharge mercury as a pollutant?
Which is the most widely used coagulant for the treatment of turbid water?
Which is the most widely used coagulant for the treatment of turbid water?
The maximum CO₂ is emitted into the atmosphere by
The maximum CO₂ is emitted into the atmosphere by
Photochemical smog is formed from automobile exhaust
Photochemical smog is formed from automobile exhaust
Pick out the one which is not a chemical coagulant.
Pick out the one which is not a chemical coagulant.
Sulphur dioxide present in the industrial chimney exhaust gases causes
Sulphur dioxide present in the industrial chimney exhaust gases causes
Solid content in most of the domestic sewage is about __________ percent.
Solid content in most of the domestic sewage is about __________ percent.
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
Which of the following is not a practical method of low level radioactive waste disposal?
Which of the following is not a practical method of low level radioactive waste disposal?
Polluted water having low BOD are most economically treated in
Polluted water having low BOD are most economically treated in
Inorganic impurities causing water pollution is
Inorganic impurities causing water pollution is
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
Which of the following is the most widely used disinfectant in water treatment?
Which of the following is the most widely used disinfectant in water treatment?
Infective bacteria in water is killed by the __________ process.
Infective bacteria in water is killed by the __________ process.
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
Which of the following is a manmade source of air pollution?
Which of the following is a manmade source of air pollution?
Global warming may result in
Global warming may result in
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.
Which of the following is the most severe air pollutant?
Which of the following is the most severe air pollutant?
Pick out the wrong statement.
Pick out the wrong statement.
World environment day is observed every year on the 5th of
World environment day is observed every year on the 5th of
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.
Pick out the correct statement.
Pick out the correct statement.
Radioactive solid nuclear wastes are disposed off by
Radioactive solid nuclear wastes are disposed off by
Pick out the wrong statement.
Pick out the wrong statement.
Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.
Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.
Which is a secondary air pollutant?
Which is a secondary air pollutant?
Which of the following sources is responsible for maximum air pollution?
Which of the following sources is responsible for maximum air pollution?
Which of the following is a secondary air pollutant?
Which of the following is a secondary air pollutant?
The term Biological Oxygen Demand (BOD) is used in relation to
The term Biological Oxygen Demand (BOD) is used in relation to
The widest explosive limit is of __________ , thereby making it the most explosive gas.
The widest explosive limit is of __________ , thereby making it the most explosive gas.
Siderosis is a disease caused by the inhalation of __________ dust.
Siderosis is a disease caused by the inhalation of __________ dust.
Main pollutants released from petroleum refineries is
Main pollutants released from petroleum refineries is
High noise levels produced during operation of fans and compressors can be reduced by using
High noise levels produced during operation of fans and compressors can be reduced by using
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.
Which is the most practical and economical method for removal of suspended solid matter from polluted water?
Which is the most practical and economical method for removal of suspended solid matter from polluted water?
Scale formation in boiler is controlled by
Scale formation in boiler is controlled by
Fresh sewage is __________ in nature.
Fresh sewage is __________ in nature.
Carcinogenic air pollutants cause
Carcinogenic air pollutants cause
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
Which of the following is not a source of ozone emission in the atmosphere?
Which of the following is not a source of ozone emission in the atmosphere?
Presence of __________ in water stream are deleterious to aquatic life.
Presence of __________ in water stream are deleterious to aquatic life.
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
The main type of sludge gas evolved during sewage treatment in Imhoff tank is
The main type of sludge gas evolved during sewage treatment in Imhoff tank is
Higher concentration of CO₂ in atmosphere
Higher concentration of CO₂ in atmosphere
Iron & manganese present as pollutant in water can not be removed by
Iron & manganese present as pollutant in water can not be removed by
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
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.)
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.)
Green house effect is accentuated by
Green house effect is accentuated by
Pollution by particulate matter emission in the atmosphere does not take place during metal
Pollution by particulate matter emission in the atmosphere does not take place during metal
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
The upper layer of atmosphere is called the
The upper layer of atmosphere is called the
Ozone level is generally found to be depleted in India in the month of
Ozone level is generally found to be depleted in India in the month of
Most of the atmospheric air pollutants are present in large quantity in
Most of the atmospheric air pollutants are present in large quantity in
Foul odour and bad taste of water is removed by treating with
Foul odour and bad taste of water is removed by treating with
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
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
In large thermal power stations very fine particulates present in flue gas are removed by
In large thermal power stations very fine particulates present in flue gas are removed by
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
Which of the following pollutants is not emitted during volcanic eruptions?
Which of the following pollutants is not emitted during volcanic eruptions?
Biological oxidation ponds remove organic matters present in the polluted water by
Biological oxidation ponds remove organic matters present in the polluted water by
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.
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.
Inhalation of silica dust by human being causes
Inhalation of silica dust by human being causes
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
Main pollutant present in automobile exhaust is
Main pollutant present in automobile exhaust is
Iron & manganese present in the polluted water is removed by
Iron & manganese present in the polluted water is removed by
Nitrogen oxides (NOx) is not produced in the __________ industry.
Nitrogen oxides (NOx) is not produced in the __________ industry.
Exposure to SO₂ containing chimney gases results in the
Exposure to SO₂ containing chimney gases results in the
Pick out the correct statement.
Pick out the correct statement.
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
Which of the following is a green house gas other than CO₂ ?
Which of the following is a green house gas other than CO₂ ?
Which of the following pollutants is absent in the emissions from a fertiliser plant ?
Which of the following pollutants is absent in the emissions from a fertiliser plant ?
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called
Corrosion in boilers can be prevented by
Corrosion in boilers can be prevented by
Presence of __________ hardness is responsible for the temporary hardness in water.
Presence of __________ hardness is responsible for the temporary hardness in water.
Tolerable limit of nitrogen oxides in air is __________ ppm.
Tolerable limit of nitrogen oxides in air is __________ ppm.
'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
Removal of __________ is accomplished by aeration of water.
Removal of __________ is accomplished by aeration of water.
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Tri-sodium phosphate is used in boiler water treatment to reduce
Tri-sodium phosphate is used in boiler water treatment to reduce
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
Threshold limit value (TLV) of CO in air is __________ ppm.
Threshold limit value (TLV) of CO in air is __________ ppm.
Carbon monoxide is a pollutant, which causes
Carbon monoxide is a pollutant, which causes
Which of the following pollutants, if present in atmosphere is detectable by its odour?
Which of the following pollutants, if present in atmosphere is detectable by its odour?
Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.
Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.
Disinfection of water is done to remove
Disinfection of water is done to remove
The commonest form of iron & manganese found in ground water as pollutant is in the form of their
The commonest form of iron & manganese found in ground water as pollutant is in the form of their
Pick out the wrong statement.
Pick out the wrong statement.
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
In water treatment plant, zeolite process is used to remove the __________ of water.
In water treatment plant, zeolite process is used to remove the __________ of water.
Color test of water is done with an instrument called
Color test of water is done with an instrument called
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
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
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
