481. In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
A. Is only provided
B. Is doubled
C. Is trebled
D. Is not enough
✅ The correct answer is option B.
Civil Engineering
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482. As compared to fresh river water, sea water contains oxygen_________________?
A. 10% less
B. 20% less
C. 10% more
D. 20% more
✅ The correct answer is option B.
483. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as___________________?
A. one dimensional flow
B. uniform flow
C. steady flow
D. turbulent flow
✅ The correct answer is option B.
484. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the______________?
A. force of adhesion
B. force of cohesion
C. force of friction
D. force of diffusion
✅ The correct answer is option B.
485. The bulk modulus of elasticity __________________?
A. has the dimensions of 1/pressure
B. increases with pressure
C. is large when fluid is more compressible
D. is independent of pressure and viscosity
✅ The correct answer is option B.
486. The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is__________________?
A. Vs = 418 (Gs – Gw) d [(3T + 70)/100]
B. Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
C. Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
D. Vs = 218 (Gs – Gw)d [(3T + 70)/100]
✅ The correct answer is option B.
487. Principle of similitude forms the basis of__________________?
A. comparing two identical equipments
B. designing models so that the result can be converted to prototypes
C. comparing similarity between design and actual equipment
D. hydraulic designs
✅ The correct answer is option B.
488. The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in__________________?
A. Chezy’s formula
B. Bazin’s formula
C. Kutter’s formula
D. Manning’s formula
✅ The correct answer is option B.
489. Flow occurring in a pipeline when a valve is being opened is ______________________?
A. steady
B. unsteady
C. laminar
D. vortex
✅ The correct answer is option B.
490. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is______________________?
A. 213.5 cm/sec
B. 313.5 cm/sec
C. 413.5 cm/sec
D. 500 cm/sec
✅ The correct answer is option B.