Sanitation Health and Hygiene MCQ Questions and Answers Quiz

31. What happens during the clarification or separation step at a wastewater treatmentplant?

  1. large solid things are screened out
  2. scum and sludge are separated from the liquid wastewater
  3. treatment with chlorine or ultraviolet light to kill pathogens
  4. liquid wastewater is mixed with air to help bacteria breakdown small particles of solid material

32. What happens during the disinfection step at a wastewater treatment plant?

  1. scum and sludge are separated from the liquid wastewater
  2. treatment with chlorine or ultraviolet light to kill pathogens
  3. liquid wastewater is mixed with air to help bacteria breakdown small particles of solid material
  4. large solid things are screened out

33. What happens to liquid wastewater in a septic tank?

  1. it evaporates through holes in the top of the septic tank
  2. it is converted to sludge over time
  3. it flows through pipes in the septic tank to the drain field
  4. it drains through the bottom of the septic tank

34. What happens to sludge in a septic tank?

  1. it dries out and form clumps that have to be shoveled out every few years
  2. it floats on top of the liquid wastewater in the tank and needs to be pumped out every few years
  3. it collects at the bottom of the tank and needs to be pumped out every few years
  4. it flows through pipes in the septic tank to the drain field

35. What happens when you flush a toilet?

  1. The flush valve is lifted and water fills the bowl.
  2. The flush valve is lowered and the water stops.
  3. The flush valve is lowered and water fills the bowl.
  4. None

36. What is a zero liquid discharge system?

  1. a system that precipitates metals out of factory wastewater by changing the pH
  2. a system that uses ozone or hydrogen peroxide to oxidize organic chemicals in factory wastewater
  3. a system that neutralizes acids or alkalis in factory wastewater
  4. a system that evaporates water from factory wastewater so only solids remain

37. What is an important material between some toilets and the bathroom floor?

  1. caulking
  2. wax seal
  3. Both
  4. no material

38. What is an occupational disease?

  1. a condition caused by a difference in the genes that someone inherited from their parents that interferes with how the body works
  2. a condition caused by a pollutant or toxin getting into someone and then interfering with growth, development or function of the body
  3. a condition caused by a foreign organism getting into someone where it interferes with how the body works and reproduces and spreads to someone else
  4. a condition caused by exposure to dangerous conditions or toxic substances in a work situation

39. What is Black water?

  1. It is waste water discharged from toilet
  2. Waste water from the bathroom
  3. Waste water from the kitchen sink

40. What is DDT?

  1. an elemental plant nutrient
  2. a low-toxicty drug taken to cure malaria
  3. a microbicide that is safe for people
  4. a persistent, chlorinated hydrocarbon insecticide
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