Top 350+ Solved Public Health Engineering MCQ Questions Answer

From 256 to 270 of 324

Q. Plain sedimentation is a process of retaining water in a basin so that the suspended particles settles down as a result of the

a. action of sun-rays

b. action of gravity and forces

c. action of velocity of the particles

d. none of these

  • b. action of gravity and forces

Q. The pipe through which liquid waste carrying human excreta flows, is called

a. waste pipe

b. soil pipe

c. vent pipe

d. all of these

  • b. soil pipe

Q. Which of the following formula is used for computing the quantity of water for fire demand?

a. Freeman's formula

b. Kuichling formula

c. Buston's formula

d. all of these

  • d. all of these

Q. The finely divided dispersion of solid particles which are not visible to the naked eye and cannot be removed by ordinary filters are known as

a. suspended impurities

b. dissolved impurities

c. colloidal impurities

d. none of these

  • c. colloidal impurities

Q. Rate of filteration of a slow sand filter ranges from

a. 10 to 100 litres / h / m2

b. 100 to 200 litres / h / m2

c. 200 to 400 litres / h / m2

d. 400 to 1000 litres / h / m2

  • b. 100 to 200 litres / h / m2

Q. For large sewers, the maximum distance between manholes should be

a. 75 m

b. 150 m

c. 200 m

d. 300 m

  • d. 300 m

Q. The velocity of flow in any sedimentation tank should not exceed

a. 0.05 mm/s

b. 0.5 mm/s

c. 5 mm/s

d. 50 mm/s

  • c. 5 mm/s

Q. Which of the following statement is correct?

a. The rate of silting in a reservoir is more in the beginning and less in the end.

b. At the economical height of a dam, its cost per million cubic metre of storage is minimum.

c. The percentage of water required for public use amounts to about 10% of the total water requirements.

d. all of the above

  • d. all of the above

Q. An arrangement for back washing is provided in

a. slow sand filter

b. sedimentation tank

c. rapid sand filter

d. all of these

  • c. rapid sand filter

Q. The seqage is treated by aerobic bacteria action in

a. settling tank

b. crickling filter

c. oxidation pond

d. all of these

  • c. oxidation pond

Q. Ventilation of house drainage is required to

a. relieve the pressure of foul gases

b. dilute the fould air in the drain

c. reduce the obnoxious effect of foul air

d. all of these

  • d. all of these

Q. The alkalinity in water is caused by

a. sodium carbonate

b. potassium carbonate

c. calcium hydroxide

d. all of these

  • d. all of these

Q. The quantity of liquid waste which flows in sewers during rainy season is called

a. storm sewage

b. dry weather flow

c. sanitary sewage

d. industrial waste

  • a. storm sewage

Q. Cleaning period for a rapid sand filter is taken as

a. 2 to 3 hours

b. 2 to 3 days

c. 2 to 3 weeks

d. 2 to 3 months

  • b. 2 to 3 days
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