A. surface tension
B. cohesion of the liquid
C. adhesion of the liquid molecules and the molecules on the surface of a solid
D. all of the above
✅ The correct answer is option D.
Civil Engineering
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712. The tendency of a liquid surface to contract is due to the following property_________________?
A. cohesion
B. adhesion
C. viscosity
D. surface tension
✅ The correct answer is option D.
713. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is___________________?
A. 1045 mm
B. 1065 mm
C. 1075 mm
D. 1095 mm
✅ The correct answer is option D.
714. In order that flow takes place between two points in a pipeline, the differential pressure between thes^ points must be more than_________________?
A. frictional force
B. viscosity
C. surface friction
D. all of the above
✅ The correct answer is option D.
715. 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.
716. The pressure exerted by_____________?
A. The sewage when running full from inside, is called internal pressure
B. The internal pressure if any, causes tensile stress in the pipe material
C. Pressure sewers are designed to be safe in tension
D. All the above
✅ The correct answer is option D.
717. 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.
718. 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.
719. 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.
720. 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.