Q.1
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
Q.2
Pick out the wrong statement.
Q.3
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
Q.4
Pick out the one which is not a chemical coagulant.
Q.5
The widest explosive limit is of __________ , thereby making it the most explosive gas.
Q.6
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
Q.7
Tolerable limit of nitrogen oxides in air is __________ ppm.
Q.8
Pick out the wrong statement.
Q.9
Exposure to SO₂ containing chimney gases results in the
Q.10
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
Q.11
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
Q.12
Which of the following industries discharge mercury as a pollutant?
Q.13
Inorganic impurities causing water pollution is
Q.14
Infective bacteria in water is killed by the __________ process.
Q.15
Ozone level is generally found to be depleted in India in the month of
Q.16
Pick out the wrong statement.
Q.17
The main type of sludge gas evolved during sewage treatment in Imhoff tank is
Q.18
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.
Q.19
Pollution by particulate matter emission in the atmosphere does not take place during metal
Q.20
Pick out the correct statement.
Q.21
Which of the following is the most severe air pollutant?
Q.22
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.)
Q.23
The commonest form of iron & manganese found in ground water as pollutant is in the form of their
Q.24
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
Q.25
Fresh sewage is __________ in nature.
Q.26
Threshold limit value (TLV) of CO in air is __________ ppm.
Q.27
Global warming may result in
Q.28
Main pollutant present in automobile exhaust is
Q.29
Biological oxidation ponds remove organic matters present in the polluted water by
Q.30
High noise levels produced during operation of fans and compressors can be reduced by using
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