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- Question
In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20°C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :
Options- A. 196 mg/l
- B. 200 m/l
- C. 204 mg/l
- D. 208 mg/l
- Correct Answer
- 200 m/l
- 1. The digested sludge from septic tanks, is removed after a maximum period of
Options- A. 3 years
- B. 3.5 years
- C. 4 years
- D. 5 years. Discuss
- 2. Chlorination of water does not remove
Options- A. ammonia content
- B. B.O.D.
- C. organic matter content
- D. dissolved oxygen. Discuss
- 3. If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as
Options- A. 0.10 m
- B. 0.20 m
- C. 0.5 m
- D. 1.0 m. Discuss
- 4. Stoke's law does not hold good if the size of particle is smaller than
Options- A. 0.0002 mm
- B. 0.002 mm
- C. 0.02 mm
- D. 0.2 mm Discuss
- 5. Stoneware sewers are available in size
Options- A. 10 cm
- B. 15 cm
- C. 20 cm
- D. 25 cm
- E. all the above. Discuss
- 6. The diameter of main bars in R.C.C. columns, shall not be less than
Options- A. 6 mm
- B. 8 mm
- C. 10 mm
- D. 12 mm Discuss
- 7. The inner section of a cavity wall, is generally known as
Options- A. butress
- B. leaf wall
- C. pillaster
- D. pillar. Discuss
- 8. The product of CAF (S P) and PWF (S P) is:
Options- A. 1/2
- B. 1
- C. 1/3
- D. 1/4 Discuss
- 9. For critical flow, the Froude number is :
Options- A. 1.0
- B. less than 1.0
- C. more than 1.0
- D. 2 Discuss
- 10. A wing rail is renewed or reconditioned if its maximum vertical wear is
Options- A. 9.5 m
- B. 7.5 m
- C. 5.5 m
- D. 5.0 m Discuss
More questions
Correct Answer: 3 years
Correct Answer: dissolved oxygen.
Correct Answer: 1.0 m.
Correct Answer: 0.0002 mm
Correct Answer: all the above.
Correct Answer: 12 mm
Correct Answer: leaf wall
Correct Answer: 1
Correct Answer: 1.0
Correct Answer: 9.5 m
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