Environmental Issues · Question 57

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

Which one of the following is the correct percentage of the two (out of the total of 4) greenhouse gases that contribute to the total global warming?

1. CFCs 14%, Methane 20%
2. CO2 40%, CFCs 30%
3. N2O 6%, CO2 86%
4. Methane 20%, N2O 18%

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

1. SE < PE < S < DE
2. SE < S < PE < DE
3. PE < S < SE < DE
4. S < DE < PE < SE

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

1. SPM
2. SO2
3. CO
4. NOx