Environmental Issues

dB is a standard abbreviation used for the quantitative expression of –

1. the dominant Bacillus in a culture
2. the density of bacteria in a medium
3. a certain pesticide
4. a particular pollutant

The two gases making highest relative contribution to the greenhouse gases are –

1. CFCs and N2O
2. CO2 and N2O
3. CO2 and CH4
4. CH4 and N2O

Global agreement in specific control strategies to reduce the release of ozone depleting substances, was adopted by :

1. The Montreal Protocol
2. The Kyoto Protocol
3. The Vienna Convention
4. Rio de Janeiro Conference

Biochemical Oxygen Demand (BOD) in a river water :

1. Gives a measure of Salmonella in the water
2. Has no relationship with concentration of oxygen in the water
3. Increases when sewage gets mixed with river water
4. Remains unchanged when algal bloom occurs

Steps taken by the Government of India to control air pollution include :

1. Permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles
2. Compulsory PUC (Pollution Under Control) certification of petrol driven vehicles which tests for carbon monoxide and hydrocarbons
3. Use of non-polluting Compressed Natural Gas (CNG) only as fuel by all buses and trucks
4. Compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel

Montreal protocol aims at :

1. Control of water pollution
2. Biodiversity conservation
3. Control of CO2 emission
4. Reduction of ozone depleting substances

DDT residues are rapidly passed through food chain causing biomagnification because DDT is :

1. Moderately toxic
2. Water soluble
3. Non-toxic to aquatic animals
4. Lipo soluble

Chipko movement was launched for the protection of -

1. Forests
2. Livestock
3. Wet lands
4. Grasslands

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this: (i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (ii) The area was sprayed with DDT by an aircraft (iii) The lake water turned green and stinky (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in the lake?

1. (i), (ii)
2. (iii), (iv)
3. (i), (iii)
4. (ii), (iii)

According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) 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. 5.2–2.5