4. Which of the following is a greenhouse gas?
(A)helium
(B)nitrogen
(C)methane
(D)oxygen

1. A fossil fuel is best described as (A)a flammable solid or gas. (B)a fuel that contains carbon. (C)a flammable substance formed from ancient biological material. (D)fossilized rock that will burn in a power station.

2. An example of a non-renewable, non-fossil energy resource is (A)oil. (B)coal. (C)tidal. (D)uranium.

3. Which of the following is not a renewable energy source? (A)biomass (B)natural gas (C)solar (D)wind

5. The enhanced greenhouse effect is due to (A)increased trapping of infrared radiation emitted from the Earth's surface and oceans. (B)decreased trapping of infrared radiation emitted from the Earth's surface and oceans. (C)increased trapping of visible and ultraviolet radiation emitted from the Earth's surface and oceans. (D)decreased trapping of visible and ultraviolet radiation emitted from the Earth's surface and oceans.

6. The mass of carbon dioxide in gigatonnes emitted into the atmosphere globally in the year 2000 was approximately (A)2 (B)8 (C)15 (D)30

7. The projected percentage increase in atmospheric carbon dioxide between the years 2000 and 2100 is approximately (A)60 (B)100 (C)200 (D)550

8. What percentage of the energy in coal in the ground reaches the home? (A)10 (B)25 (C)90 (D)213

9. How much energy is not converted to electricity when one kilogram of coal is burnt in a power station? (A)800 kJ (B)2100 kJ (C)4200 kJ (D)5580 kJ

10. The amount of dioxin required to kill an animal depends on its body weight. If 50% of dogs die when they consume a dose of 1.5 mg/kg, what dose would be expected to kill 50% of dogs that weigh 15 kg? (A)0.1 mg (B)1.5 mg (C)7.5 mg (D)22.5 mg

11. A factory uses recycled paper to produce pulp that is then used to make paper. If 75% of the recycled paper is converted into pulp, how much recycled paper is required to produce 1 tonne of pulp? (A)0.25 tonnes (B)0.75 tonnes (C)1.33 tonnes (D)1.50 tonnes

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