Hotel Service Unit 10 Q6 Quiz

Hotel Service Unit 10 Sewage Q6

1 / 4

What is the main difference between aerobic and anaerobic microorganisms in sewage treatment?

C) Aerobic microorganisms break down solids, while anaerobic ones break down liquids

D) Aerobic microorganisms produce gas, while anaerobic ones do not

A) Aerobic microorganisms need oxygen to break down waste, while anaerobic microorganisms do not

B) Aerobic microorganisms thrive in water, while anaerobic ones require dry conditions

2 / 4

What is the main danger of producing methane, hydrogen sulfide, and carbon dioxide in a confined space?

A) They can ignite spontaneously

B) They displace oxygen, causing a risk of asphyxiation and hydrogen sulfide is toxic even at low concentrations

D) They promote bacterial growth

C) They increase humidity in the space

3 / 4

Which of the following gases are produced under anaerobic conditions in sewage treatment plants?

A) Oxygen, carbon dioxide, and methane

D) Sulfur dioxide, oxygen, and nitrogen

C) Nitrogen, hydrogen, and methane

B) Methane, hydrogen sulfide, and carbon dioxide

4 / 4

What is the difference between black water and grey water in a sewage treatment plant?

B) Black water is from rainwater runoff, while grey water is from bilge tanks

C) Black water is treated sewage, and grey water is untreated sewage

A) Black water comes from toilets, while grey water comes from sinks, showers, and galley drains

D) Black water contains only chemicals, while grey water contains solid waste

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