Lead in water can cause
arthritis
hair falling
kidney damage
All of these
The lowest layer of earth's atmosphere is
troposphere
mesosphere
stratosphere
ionosphere
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 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.
Ozone hole is maximum over
India
Pakistan
Australia
Antarctica
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 capacity of blood.
BHC and DDT act as
carcinogens
allergens
asthematic agents
all of these
Lead population is mainly caused by
sewage
insecticide
leaded gasoline
None of these
Which of the following statement is false?
London smog is oxidising in nature
London smog causes bronchitis
London smog is formed in winter
London smog contains H2SO4 droplets
