761. The grit chambers of sewage treatment plants, are generally cleaned after__________________?
A. 2 days
B. 7 days
C. 12 days
D. 14 days
✅ The correct answer is option D.
Civil Engineering
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762. Which one the following is a correct statement ?
A. The vertical section of the soil extending into the parent material, is called profile
B. The layers of the soil parallel to the earth surface are called horizons
C. The transitional layer between two adjoining horizons is called boundary
D. All of these
✅ The correct answer is option D.
763. If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________?
A. 1.250 D
B. 1.350 D
C. 1.425 D
D. 1.625 D
✅ The correct answer is option D.
764. The specific weight of water is 1000 kg/m” _______________?
A. at norma] pressure of 760 mm
B. at 4°C temperature
C. at mean sea level
D. all the above
✅ The correct answer is option D.
765. The stone ware sewers_________________?
A. Are used for carrying sewage and drainage from houses
B. Are manufactured from clays and shale
C. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
D. All the above
✅ The correct answer is option D.
766. For a floating body to be in equilibrium __________________?
A. meta center should be above e.g.
B. center of buoyancy and e.g. must lie on same vertical plane
C. a righting couple should be formed
D. all of the above
✅ The correct answer is option D.
767. The discharge per unit plan area of a sedimentation tank, is generally called________________?
A. Over flow rate
B. Surface loading
C. Over flow velocity
D. All the above
✅ The correct answer is option D.
768. Fluid is a substance that_______________?
A. cannot be subjected to shear forces
B. always expands until it fills any container
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force
✅ The correct answer is option D.
769. Density of water is maximum at ___________________?
A. 0°C
B. 0°K
C. 4°C
D. 100°C
✅ The correct answer is option D.
770. The sewer which resists sulphide corrosion, is____________________?
A. Brick sewer
B. Cast iron sewer
C. R.C.C. sewer
D. Lead sewer
✅ The correct answer is option D.