This set of Waste Water Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Disposal of Excretal Wastes”.
1. Which of the following is the most commonly used form of excretal disposal?
a) Cartage
b) Sanplat
c) VIP latrine
d) Twin pit latrine
View Answer
Explanation: Cartage is the most basic form of excreta disposal—faeces are collected in a container and disposed of daily and example is the bucket latrine.
2. Bucket latrines pose health risks.
a) True
b) False
View Answer
Explanation: Bucket latrines should not be promoted because they pose health risks to both users and collectors and may spread disease.
3. What is the maximum number of pits considered in pit latrines?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Indeed, some pit latrines are designed to allow faecal matter to compost and be reused in agriculture whereas other designs use two alternating pits.
4. Sanplat is a type of pit latrine.
a) True
b) False
View Answer
Explanation: The sanplat is the cheapest and most basic pit latrine and is a small concrete platform (usually 60 cm * 60 cm or smaller), laid on top of logs or other supporting material traditionally used to cover the pit.
5. Which of the following latrines is the cheapest one?
a) Pour-flush latrines
b) Twin pit latrine
c) VIP latrine
d) Sanplat
View Answer
Explanation: The sanplat provides a sanitary platform which can be easily cleaned to limit the presence of helminths such as hookworm.
6. What is the normal size of concrete of Sanplat latrines?
a) 20 cm * 20 cm
b) 40 cm * 40 cm
c) 60 cm * 60 cm
d) 80 cm * 80 cm
View Answer
Explanation: It is a small concrete platform (usually 60 cm * 60 cm or smaller), laid on top of logs or other supporting material traditionally used to cover the pit. The sanplat provides a sanitary platform which can be easily cleaned to limit the presence of helminths such as hookworm.
7. What is the amount of water used in pour flush latrines for a single time use?
a) 0.5-1 litres
b) 1-3 litres
c) 3-6 litres
d) 6-8 litres
View Answer
Explanation: A pour–flush latrine is a type of pit latrine where small volumes of water (commonly 1–3 litres) are used to flush faeces into the pit.
8. Wastes are disposed of through a section of pipe bent into a U shape (a U-bend) to maintain ________
a) Cleanliness
b) Water seal
c) Proper flushing
d) Water
View Answer
Explanation: Water seal is maintained by a U shape and wastes are disposed by it. It reduces fly and odour problems. A vent pipe may also be added to the pit to help with fly and odour problems.
9. An aquaprivy is similar to a _______
a) Sanplat
b) VIP latrine
c) Soak pit
d) Septic tank
View Answer
Explanation: An aquaprivy is similar to a septic tank; it can be connected to flush toilets and take most household wastewater.
10. Which of these is not true regarding reuse of treated sewage and sludge?
a) Reduces costs of abstracting irrigation water
b) Reduces demand on valuable water resources
c) Increases pollution
d) Promotes better use of water resources
View Answer
Explanation: The reuse of treated sewage effluent and sludge reduces the costs of abstracting irrigation water, reduces demand on valuable water resources, promotes better use of water resources and decreases pollution by reducing the waste load discharged into water bodies.
11. ______ causes blue baby syndrome.
a) Nitrate
b) Carbon
c) Aluminium
d) Iron
View Answer
Explanation: Nitrate has been linked to the “blue-baby” syndrome that can be fatal in infants. Chloride increases water salinity and affects soil fertility.
12. _____ is the residue from burning combustible material used for cooking and other heating purposes.
a) Garbage
b) Rubbish
c) Dirt
d) Ash
View Answer
Explanation: Ash is the residue from burning wood, coal, charcoal and other combustible materials used for cooking and heating purposes in houses, industries, etc.
13. What is the maximum amount of solid waste produced in a country per capita per year?
a) 0.25 Kg
b) 0.5 Kg
c) 1.5 Kg
d) 2.5 Kg
View Answer
Explanation: Sources of solid wastes are street refuse, market refuse, table litter, industrial refuse and domestic refuse. In most of the countries, the per capita daily solid waste produced is between 0.25-2.5 Kg.
14. What is the space provided per capita per day in public bins?
a) 0.1 cubic feet
b) 0.2 cubic feet
c) 0.3 cubic feet
d) 0.4 cubic feet
View Answer
Explanation: Galvanized steel dustbins with cover are used for household wastes. 0.05-0.1 cubic feet per capita per day is usually provided. A bin with a capacity of 1.5 cubic feet for a family of 5 members is provided if the collection is done every 3 days.
15. What is the time frame required for anaerobic digestion?
a) 1-2 months
b) 2-3 months
c) 3-4 months
d) 4-6 months
View Answer
Explanation: Lying of dry and condensed refuse in a trench or other prepared area with intervening earth coverings is done. Anaerobic digestion of the refuse takes place and the process takes 4-6 months to complete.
Sanfoundry Global Education & Learning Series – Waste Water Engineering.
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