Q.1
Carcinogenic air pollutants cause
Q.2
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.
Q.3
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called
Q.4
Exposure to chemicals having carcinogenic properties cause
Q.5
Exposure to chemicals having carcinogenic properties cause
Q.6
Beyond what concentration of H₂S in air, acute danger to human life exists?
Q.7
Smog is not formed due to the presence of __________ in the atmosphere.
Q.8
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
Q.9
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
Q.10
Which of the following is a green house gas other than CO₂ ?
Q.11
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes
Q.12
Iron & manganese present in the polluted water is removed by
Q.13
Which of the following is not a source of ozone emission in the atmosphere?
Q.14
Carbon monoxide is a pollutant, which causes
Q.15
Which of the following pollutants is not emitted during volcanic eruptions?
Q.16
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
Q.17
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
Q.18
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
Q.19
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?
Q.20
The term Biological Oxygen Demand (BOD) is used in relation to
Q.21
Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.
Q.22
Most of the atmospheric air pollutants are present in large quantity in
Q.23
Solid content in most of the domestic sewage is about __________ percent.
Q.24
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the
Q.25
The Killer gas which caused Bhopal gas tragedy in 1984 was
Q.26
__________ substances present in sewage are removed in grit chamber during sewage treatment.
Q.27
H₂S present in gaseous stream can be removed by adsorption on
Q.28
Persons working in cement plants and limestone quarries are more prone to disease like
Q.29
Dissolved oxygen content in river water is around __________ ppm.
Q.30
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
0 h : 0 m : 1 s