Presence of high concentration of ozone and smog in atmospheric air causes the
Presence of high concentration of ozone and smog in atmospheric air causes the
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
Inhalation of silica dust causes a disease called
Inhalation of silica dust causes a disease called
A standard test for determination of hardness in water is termed as __________ test.
A standard test for determination of hardness in water is termed as __________ test.
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
COD of raw municipal sewage may be in the range of about __________ mg/litre.
COD of raw municipal sewage may be in the range of about __________ mg/litre.
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?
Noise level in a quiet private business office is about __________ decibels.
Noise level in a quiet private business office is about __________ decibels.
Beyond what concentration of H₂S in air, acute danger to human life exists?
Beyond what concentration of H₂S in air, acute danger to human life exists?
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
Operating principle of cyclone separator is based on the action of __________ dust particles.
Operating principle of cyclone separator is based on the action of __________ dust particles.
The function of skimming tank in sewage treatment is to remove __________ substances.
The function of skimming tank in sewage treatment is to remove __________ substances.
In a sedimentation tank, the detention period for water ranges from __________ hours.
In a sedimentation tank, the detention period for water ranges from __________ hours.
5-200 μm size particles are called
5-200 μm size particles are called
The principal gas evolved from sludge digestion tank is
The principal gas evolved from sludge digestion tank is
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the
Turbidity of water is an indication of the presence of
Turbidity of water is an indication of the presence of
Most of the bacteria in sewage are
Most of the bacteria in sewage are
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
Smog is not formed due to the presence of __________ in the atmosphere.
Smog is not formed due to the presence of __________ in the atmosphere.
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
H₂S present in gaseous stream can be removed by adsorption on
H₂S present in gaseous stream can be removed by adsorption on
In water treatment, alum[Al2(SO₄)3] is used for the process of
In water treatment, alum[Al2(SO₄)3] is used for the process of
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
Presence of soluble organics in polluted water causes
Presence of soluble organics in polluted water causes
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
Reingleman chart No. 2 corresponds to __________ percent black smoke.
Reingleman chart No. 2 corresponds to __________ percent black smoke.
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
The lowest layer of atmosphere is known as the
The lowest layer of atmosphere is known as the
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
Peroxyacyl nitrate (PAN), a pollutant is found in the
Peroxyacyl nitrate (PAN), a pollutant is found in the
Which of the following is an adsorbant used for the removal of SO₂ from gas/air?
Which of the following is an adsorbant used for the removal of SO₂ from gas/air?
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
Exposure to chemicals having carcinogenic properties cause
Exposure to chemicals having carcinogenic properties cause
Presence of iron and manganese in water causes
Presence of iron and manganese in water causes
TLV of aldrin in public water supply system is about __________ μg/litre.
TLV of aldrin in public water supply system is about __________ μg/litre.
The Killer gas which caused Bhopal gas tragedy in 1984 was
The Killer gas which caused Bhopal gas tragedy in 1984 was
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
Exposure to chemicals having carcinogenic properties cause
Exposure to chemicals having carcinogenic properties cause
__________ is the process of killing organism in water.
__________ is the process of killing organism in water.
Pick out the wrong statement pertaining to 'green house' for the plants.
Pick out the wrong statement pertaining to 'green house' for the plants.
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because
BOD of raw municipal sewage may be in the range of about __________ mg/litre.
BOD of raw municipal sewage may be in the range of about __________ mg/litre.
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
A shallow pond in which the sewage is retained and biologically treated is called
A shallow pond in which the sewage is retained and biologically treated is called
Main pollutants released from iron & steel industry is
Main pollutants released from iron & steel industry is
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
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 dust collection equipments is the least efficient (for sub-micronic particles)?
Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
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 the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).
In sewage treatment, its sedimentation is speeded up by commonly adding
In sewage treatment, its sedimentation is speeded up by commonly adding
Fine grit present in sewage is removed in the __________ during sewage treatment.
Fine grit present in sewage is removed in the __________ during sewage treatment.
Out of the following, TLV of __________ is maximum (about 500 ppm).
Out of the following, TLV of __________ is maximum (about 500 ppm).
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
Reingleman chart is used for the evaluation of __________ pollution.
Reingleman chart is used for the evaluation of __________ pollution.
Noise level inside a jet air liner in normal flight is about __________ decibels.
Noise level inside a jet air liner in normal flight is about __________ decibels.
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)
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)
The permissible color for domestic water supply is __________ ppm.
The permissible color for domestic water supply is __________ ppm.
Average human body contains about __________ percent water by weight.
Average human body contains about __________ percent water by weight.
Persons working in cement plants and limestone quarries are more prone to disease like
Persons working in cement plants and limestone quarries are more prone to disease like
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
White smoke coming out of the chimney of a furnace indicates the use of
White smoke coming out of the chimney of a furnace indicates the use of
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.
Dissolved oxygen content in river water is around __________ ppm.
Dissolved oxygen content in river water is around __________ ppm.
Pick out the wrong statement.
Pick out the wrong statement.
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
Noise level during normal conversation among men is about __________ decibles.
Noise level during normal conversation among men is about __________ decibles.
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
__________ substances present in sewage are removed in grit chamber during sewage treatment.
__________ substances present in sewage are removed in grit chamber during sewage treatment.
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.
What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries?
What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries?
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
Insufficient washing of sand grains in a rapid sand filter causes
Insufficient washing of sand grains in a rapid sand filter causes
Which of the following is the most lethal water pollutant?
Which of the following is the most lethal water pollutant?
Septic tanks are used for the __________ of the deposited solids.
Septic tanks are used for the __________ of the deposited solids.
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
Ethanolamine is an absorbant used for the removal of __________ from air/gas.
Ethanolamine is an absorbant used for the removal of __________ from air/gas.
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
Noise pollution level in a chemical plant is expressed in
Noise pollution level in a chemical plant is expressed in
