11.
Which one of the following group of gases contributes to the 'Green House Effect'?

12.
Black lung disease occurs in people working in

13.
The least preferred technique in the disposal of Municipal Solid Waste is

14.
Which one of the following was used as a chemical weapon in the first world war ?

15.
The depletion of ozone layer is due to

16.
Ozone depletion in the atmosphere is mainly caused by

17.
Ozone depletion in the stratosphere is mainly caused by

18.
Which of the following is not a gaseous air pollutant?

19.
Which of the following is ozone depleting pesticide ?

20.
Threshold limit value of copper in the atmospheric air is