Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year
1986
1987
1988
1988
B.
1987
In 1987, twenty seven industrialized countries signed the Montreal Protocol for reduction in production and release of ozone layer depleting CFCs(Chloro fluoro carbons) into the atmosphere. It was followed by increasingly stringent amendments in London in 1990 and in Copenhagen in 1992.
Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste water into natural surface water, is:
< 3.0 ppm
< 10 ppm
< 100 ppm
< 100 ppm
Which one of the following is not a bioindicator of water pollution?
Sludge-worms
Blood-worms
Stone files
Stone files
Which one of the following statements is not valid for aerosols?
They are harmful to human health
They alter rainfall and monsoon patterns
They cause increased agricultural productivity
They cause increased agricultural productivity
Photochemical smog pollution does not contain
ozone
nitrogen dioxide
carbon dioxide
carbon dioxide
