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
Aerosols present in air are
negatively charged
positively charged
neutral
combination of all of the above
The lowest layer of earth's atmosphere is
troposphere
mesosphere
stratosphere
ionosphere
Pollutants released from iron and steel industry are
CO2, NO2, H2S
CO, CO2, SO2
CO2, SO2, NO2
CO2, NO, SO2
Ultraviolet radiation is absorbed by
exosphere
Global warming may result in
flood
cyclone
decrease in forest productivity
all of the above
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
