Waste Water Engineering problems
- 1. Which one of the following part of human body withstands minimum radiation
Options- A. thyroid
- B. kidneys
- C. eyes
- D. ovaries/testis. Discuss
Correct Answer: ovaries/testis.
- 2. Which one of the following gases is most significant as air pollutant
Options- A. Carbondioxide
- B. Oxygen
- C. Nitrogen
- D. Sulphurdioxide. Discuss
Correct Answer: Sulphurdioxide.
- 3. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
Options- A. 1 in 60
- B. 1 in 100
- C. 1 in 120
- D. none of these. Discuss
Correct Answer: 1 in 100
- 4. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
Options- A. 0°C
- B. 15°C
- C. 20°C
- D. 25°C. Discuss
Correct Answer: 20°C
- 5. Which one of the following statements regarding septic tanks is wrong :
Options- A. a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
- B. the outlet invert level is kept 5 to 7.5 cm below the inlet invert level
- C. the minimum width of septic level is 90 cm
- D. the depth of tank is kept equal to its width. Discuss
Correct Answer: the depth of tank is kept equal to its width.
- 6. Design period of 40 to 50 years is adopted for
Options- A. branch sewers
- B. main sewers
- C. trunk sewers
- D. all the above. Discuss
Correct Answer: all the above.
- 7. The most widely used pump for lifting sewage is
Options- A. centrifugal pump
- B. reciprocating pump
- C. pneumatic ejector
- D. air pressure pump. Discuss
Correct Answer: centrifugal pump
- 8. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
Options- A. 20 m
- B. 30 m
- C. 45 m
- D. 75 m. Discuss
Correct Answer: 45 m
- 9. The sludge does not contain waste water from
Options- A. bath rooms
- B. wash basins
- C. kitchen sinks
- D. toilets. Discuss
Correct Answer: toilets.
- 10. The self-cleansing velocity of water flowing through pipe lines, is
Options- A. 2 metres/sec
- B. 1 metre/sec
- C. 0.5 metre/sec
- D. 0.25 metre/sec. Discuss
Correct Answer: 2 metres/sec
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