1. Which of the following is regarded as the main cause of groundwater contamination?
(a) agricultural products
(b) landfills
(c) septic tanks
(d) All of the above main sources of ground water contamination.
2. Which of following is One of the best solutions to get rid of non-biodegradable wastes is :
(a) Recycling waste
(b) Burying waste
(c) Burning waste
(d) All of the above
3. Upper part of sea/aquatic ecosystem contains
(a) plankton
(b) nekton
(c) plankton and nekton
(d) benthos.

4. Which of the following can be used for controlling Gaseous Pollutant?
(a) Arrestor
(b) Incineration
(c) Absorption
(d) None of above
5. What does the high Biological Oxygen Demand (BOD) indicates?
(a) High level of Microbial Pollution
(b) Low level of Microbial Pollution
(c) Absence of Microbial Pollution
(d) Water is fully pure
6. Which of the following is not a renewable energy source?
A. wind
B. solar
C. biomass
D. natural gas

7. Which of the following is the best description of sulfur dioxide?
A. a gas less dense than air
B. a gas more dense than air
C. a gas insoluble in water
D. an acidic liquid at ordinary room temperature
8. In releasing the water into the river, which one of the following environmental consequences will most likely need to be avoided?
A. erosion
B. evaporation
C. dryland salinity
D. increased salinity in the river
9. Acid rains are produced by
(a) excess NO2 and SO2 from burning fossil fuels
(b) excess production of NH3 by industry and coal gas
(c) excess release of carbon monoxide by incomplete combustion
(d) excess formation of CO2 by combustion and animal respiration.

10. In an ecosystem, which one shows one-way passage
(a) free energy
(b) carbon
(c) nitrogen
(d) potassium
11. Deep black soil is productive due to high proportion of
(a) sand and zinc
(b) gravel and calcium
(c) clay and humus
(d) silt and earthworm
12. Soil fertility is reduced by
(a) crop rotation
(b) nitrogen fixing bacteria
(c) decaying organic matter
(d) intensive agriculture