dB is a standard abbreviation used for the quantitative expression of
1. the density of bacteria in a medium
2. a particular pollutant
3. the dominant Bacillus in a culture
4. a certain pesticide
The two gases making highest relative contribution to the greenhouse gases are
1. CO2 and CH4
2. CH4 and NO2
3. CFCs and N20
4. CO2 and N20
Chipko movement was launched for the protection of
1. grasslands
2. forests
3. liverstock
4. wet lands
DDT residues are rapidly passed through food chain causing biomagnification because
DDT is :-
1. lipid soluble
2. moderately toxic
3. non-toxic to aquatic animals
4. water soluble
Steps taken by the Government of India to control air pollution include
1. compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel
2. compulsory PUC (Pollution Under Control) certification of petrol driven vehicles, which
tests for carbon monoxide and hydrocarbons
3. permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for
vehicles
4. use of non-polluting Compressed Natural Gas (CNG) only as fuel by all buses and
trucks
Montreal protocol aims at
1. reduction of ozone depleting substances
2. biodiversity conservation
3. control of water pollution
4. control of CO2 emission
Global agreement in specific control strategies to reduce the release of ozone depleting
substances, was adopted by
1. Rio de Janeiro Conference
2. The Montreal Protocol
3. The Koyoto Protocol
4. The Vienna Convention
A lake near a village suffered heavy mortality of fishes within a few days. Consider the
following reasons for this
(1) Lots of urea and phosphate fertilizer were used in the crops in the vicinity.
(2) The area was sprayed with DDT by an aircraft.
(3) The lake water turned green and stinky.
(4) Phytoplankton populations in the lake declined initially thereby greatly reducing
photosynthesis.
Which two of above were the main causes of fish mortality in the lake?
1. 2, 3
2. 3, 4
3. 1, 3
4. 1, 2
According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometres) of the air pollutants is responsible for greatest harm to human health?
1. 2.5 or less
2. 1.5 or less
3. 1.0 or less
4. 5.2 or 2.5
Which one of the following is being tried in India as a biofuel substitute for fossil fuels?
1. Jatropha
2. Azadirachta
3. Musa
4. Aegilops