Ozone hole is:

1.	a partial gap in the stratospheric ozone layer over Antarctica
2.	a partial gap in the stratospheric ozone layer over Arctic
3.	thinning of ozone layers over polar regions
4.	excessive buildup of lower troposphere ozone

Which of the following is implicated in the causation of skin cancers and snow-blindness cataracts in humans?

The normal greenhouse effect is necessary for survival of life on Earth as it has raised the temperature of Earth’s surface by:

The correct descending order of the relative contribution of various greenhouse gases to total global warming is:
1. carbon dioxide; methane; nitrous oxide; CFCs
2. carbon dioxide; CFCs; methane; nitrous oxide
3. carbon dioxide; CFCs; nitrous oxide; methane
4. carbon dioxide; methane; CFCs; nitrous oxide

An abnormal warming of surface ocean waters in the eastern tropical Pacific is termed as:

The three-mile island is famous as:

Burying the radioactive wastes is not acceptable to many people as:
1. there is a risk of groundwater contamination
2. it may explode
3. it will harm the buried dead bodies
4. it may get accumulated in vegetation

The “Polyblend” developed by Ahmad Khan is a:
1. possible solution to accumulating plastic wastes
2. method for dealing with electronic wastes
3. synthetic fiber produced in India
4. organic farming product

Ecological sanitation, also known as 'Ecosan', is a new paradigm in sanitation that:

In a water body polluted with biodegradable organic compounds,
1. the BOD and DO content are low
2. the BOD and DO content are high
3. the BOD is low and DO content is high
4. the BOD is high and DO content is low