Formula of tear gas is
COCl2
N2O
C10H5ClN2
none of these
Lead population is mainly caused by
sewage
insecticide
leaded gasoline
None of these
Persons working in cement plants and lime stone quarries are more prone to disease like
asthama
cancer
silicosis
pneumoconiosis
Ozone in stratosphere is depleted by
C6F6
C6H6Cl6
CF2Cl2
C7F16
Ozone depletion in the stratosphere is mainly caused by
SO2
NO2
NO
Chlorofluorocarbons
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
Lead in water can cause
arthritis
hair falling
kidney damage
All of these
BHC and DDT act as
carcinogens
allergens
asthematic agents
all of these
Aerosols present in air are
negatively charged
positively charged
neutral
combination of all of the above
Global warming may result in
flood
cyclone
decrease in forest productivity
all of the above