Ozone depletion in the stratosphere is mainly caused by
SO2
NO2
NO
Chlorofluorocarbons
Main pollutant from automobile exhaust is
CO
CO2
Hydrocarbons
Formula of tear gas is
COCl2
N2O
C10H5ClN2
none of these
A person dies in atmospheric of CO because it
combines with oxygen present in the body
destroys W.B.C
reduces water in the tissues.
combines with haemoglobin of blood and form stable compound carboxyhaemoglobin and reduces the oxygen carrier capecity of blood .
Planting more and more trees helps to
reduce CO2 in the air
increase CO2 in the air
reduce O2 in the air
reduce CO2 and increase O2 in the air
Aerosols present in air are
negatively charged
positively charged
neutral
combination of all of the above
Ultraviolet radiation is absorbed by
exosphere
ionosphere
mesosphere
stratosphere
Which of the following statement is wrong ?
Polar stratospheric clouds (PSCs) are clods formed over Antarctica.
Acis 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 .
Ozone in stratosphere is depleted by
C6F6
C6H6Cl6
CF2Cl2
C7F16
BHC and DDT act as
carcinogens
allergens
asthematic agents
all of these
