Presence of __________ bacteria in water causes disease like typhoid
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.)
t = 15 - 0.0035h
t = 15 - 0.0065h
t = 0.0035h -15
Maximum permissible residual chlorine in treated water should be __________ mg/litre
5 to 10
02 to 0.3
0.001 to 0.01
2 to 3
Industrial workers working in leather tanning & manufacturing units are prone to suffer from
skin diseases (e.g. dermatities).
respirtory ailments (e.g. bronchitis).
Presence of dissolved impurities of __________ is responsible for the red brownish color of water
iron & manganese
Which of the following processes is involved in the biochemical treatment of sewage effluents
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels
Dissolved oxygen content in river water is around __________ ppm
The pH value of oxidised sewage is about
In a sedimentation tank, the detention period for water ranges from __________ hours
16 to 20
24 to 32
8 to 12
2 to 4
Algae growth in water is controlled by
Coal mines drainage waste water
(acidic in nature) results from the earth's water percolating through the voids created in coal bed duringmining.
This polluted water which either drains out naturally to water courses or are removed before starting the mining is
diluted with fresh water to reduce its acidity.
None of these.
left as such without any treatment.
neutralised by alkali treatment.
White smoke coming out of the chimney of a furnace indicates the use of
liquid fuel in the furnace.
gaseous fuel in the furnace.
low excess air.
very high excess air.
Which of the following is not a secondary air pollutant
All (A), (B) & (C)
Average human body contains about __________ percent water by weight
Presence of non-biodegradable substances, like alkyl benzene sulphonate
(ABS) from the detergents in polluted water stream causes
depletion of dissolved oxygen.
In water treatment plant, zeolite process is used to remove the __________ of water
iron & zinc
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
coagulation and flocculation of colloids.
oxidation of carbonaceous matter to CO2.
all (a), (b) and (c).
Acute danger to human life (
i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent
Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for
conversion of NOx into N2 and NH3 in the first compartment.
oxidation of unburnt hydrocarbon fuel in the second compartment.
all (a), (b) and (c).
conversion of CO into CO2 in the second compartment.
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