1. Digesting manure anaerobically (without air) will yield mainly: a. Alcohol. b
ID: 114831 • Letter: 1
Question
1. Digesting manure anaerobically (without air) will yield mainly:
a. Alcohol.
b. Methane.
c. Carbon Dixoide.
d. Ammonia.
e. None of the above.
2.The hazards of radioactive wastes are that such elements
a. give off radio signals that are disruptive to radio, TV and communications.
b. are extremely toxic in the same way that arsenic, lead and mercury are toxic.
c. Give off high energy emissions that damage DNA and consequently may lead to mutations, cancer and birth defects.
d. Give off low energy emissions that damage DNA and consequently may lead to mutations, cancer and birth defects.
e. There are no hazards as long as they are buried.
3.This is the name of the unwanted materials left over during mining operations.
a. Slag
b. Reserves
c. Tailings
d. Deposits
e. None of the above
4.Causes for species decline and species extinction include:
a. Habitat alteration.
b. Introduction of a new species.
c. Overhunting.
d. Secondary extinctions.
e. All of the above.
5.Which is the following statements is NOT CORRECT ? Advantages of hydropower include:
a. It is non-polluting.
b. It is sustainable.
c. It is renewable.
d. Its development requires few environmental trade-offs.
e. None of the above.
Explanation / Answer
1] Option b is correct
Methane yield via anaerobic digestion of multi-component substrates based on mixtures of biodegradable single-component substrates with cow dung as main component. Bench and full-scale digestion experiments were carried out for both single and multi-component substrates to identify the relationship between methane yield and substrate composition
2] Option d is correct
3] Option c is correct
Tailings are the byproducts left over from mining and extracting resources, such as extracting bitumen from the oilsands or minerals such as copper or gold from ores. Tailings include: Finely ground rock particles – ranging from sand-sized to silt-sized. Chemicals used to extract the valuable mineral or oil.
4] Option c is correct
5] Option d is correct
Hydropower is non-polluting, sustainable, renewable and its development relies on the water cycle.
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