1. The most serious environmental effect posed by hazardous wastes is:
A) Air Pollution.
B) Contamination of Groundwater
C) Increased Use Of Land For Landfills.
D) Destruction of Habitat.

2. The concentration of which gas is highest in our environment?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Carbon dioxide

3. What is the harm from the depletion of Earth’s ozone layer
A) The average temperature of earth’s surface will increase gradually
B) The oxygen content of the atmosphere will decrease
C) Increased amount of Ultra violet radiation will reach earth’s surface
D)Sea levels will rise as the polar ice caps will gradually melt

4. The three primary soil macronutrients are
A) Carbon, Oxygen, and Water.
B) Copper, Cadmium, and Carbon.
C) Potassium, Phosphorus, and Nitrogen.
D) Boron, Zinc, and Manganese.

5.Which of the following is not an important characteristic of the Green Revolution?
A) Mechanized Agriculture
B) Hybrid Seeds
C) Slash and Burn
D) Monoculture

6. The presence of high coliform counts in water indicate
A) Contamination By Human Wastes
B) Phosphorus Contamination
C) Decreased Biological Oxygen Demand
D) Hydrocarbon Contamination

7. The depletion in the Ozone layer is caused by
A) Nitrous Oxide
B) Carbon Dioxide
C) Chlorofluorocarbons
D) Methane

8. The concentration of which gas is highest in our environment?
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Carbon dioxide

9. The most serious environmental effect posed by hazardous wastes is:
A) Air Pollution.
B) Contamination of Groundwater
C) Increased Use of Land for Landfills
D) Destruction of Habitat

10. The stage in which the biological processes is used to purify water in a waste water treatment plants is called:
A) Secondary Sewage Treatment
B) Primary Sewage Treatment
C) Waste water Reduction
D) Biochemical Reduction