BHC and DDT act are
carcinogens
allergens
asthematic agents
all of these
Global warming may result in
flood
cyclone
decrease in forest productivity
all of the above
Pollutants released from iron and steel industry are
CO2, NO2, H2S
CO, CO2, SO2
CO2, SO2, NO2
CO2, NO, SO2
Aerobic oxidation is caused by
aerobic bacteria in presence of excess of oxygen
aerobic bacteria in absence of oxygen
anaerobic bacteria in presence of oxygen
anaerobic bacteria in absence of oxygen
Which of the following statement is false?
London smog is oxidizing in nature
London smog causes bronchitis
London smog is formed in winter
London smog contains H2SO4 droplets
Ultraviolet radiation is absorbed by
exosphere
ionosphere
mesosphere
stratosphere
Ozone depletion in the stratosphere is mainly caused by
SO2
NO2
NO
Chlorofluorocarbons
Which of the following statement is wrong ?
Polar stratospheric clouds (PSCs) are clouds formed over Antarctica.
Acid rain dissolves heavy metals such as Cu, Pb, Hg and Al from soil, rocks and sediments.
H2SO4 is major contributor to acid rain. HNO3 ranks second and HCl third in this respect.
Fishes grow as well in warm as in cold water.
The lowest layer of earth's atmosphere is
troposphere
Aerosols present in air are
negatively charged
positively charged
neutral
combination of all of the above
