431. The factor responsible for purification of sewage in river is________________?
A. Hydrology
B. Dissolved oxygen in water
C. Temperature
D. All the above
✅ The correct answer is option D.
Civil Engineering Mcqs MCQs
432. The sewer pipes__________________?
A. Carry sewage as gravity conduits
B. Are designed for generating self-cleansing velocities at different discharge
C. Should resist the wear and tear caused due to abrasion
D. All the above
✅ The correct answer is option D.
433. Pick up the incorrect size of stone ware sewers_________________?
A. 52.5 cm
B. 67.5 cm
C. 82.5 cm
D. None of these
✅ The correct answer is option D.
434. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?
A. 2.25
B. 2.50
C. 2.55
D. 2.65
✅ The correct answer is option D.
435. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________?
A. 20 cm
B. 25 cm
C. 40 cm
D. 50 cm
✅ The correct answer is option D.
436. During purification process of sewage the gas given off, is________________?
A. Carbon dioxide
B. Hydrogen
C. Ammonia
D. All the above
✅ The correct answer is option D.
437. All the terms of energy in Bernoulli’s equation have dimension of_______________?
A. energy
B. work
C. mass
D. length
✅ The correct answer is option D.
438. Ratio of inertia force to surface Jension is known as ________________________?
A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number
✅ The correct answer is option D.
439. For design purposes, the normal rate of infiltration of ground water into the sewer, is___________________?
A. 500 litres/km/cm
B. 1000 litres/km/cm
C. 1500 litres/km/cm
D. 2000 litres/km/cm
✅ The correct answer is option D.
440. What is used when a quick estimate of the doubling time for the invested money is needed ?
A. Rule of 48
B. Rule of 36
C. Rule of 24
D. Rule of 72
✅ The correct answer is option D.