civil engineering MCQs – Page 151

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs

3001. Surface energy per unit area of a surface is numerically equal to___________________?
0

A. surface tension

B. force of cohesion

C. force of adhesion

D. viscosity

E. atmospheric pressure

3002. To avoid an interruption in the flow of a syphon, an air vessel is provided______________?
0

A. at the summit

B. none of the above

C. ay nay point between inlet and outlet

D. at the inlet

E. at the outlet

3003. At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_______________?
0

A. minimum

B. could be any value

C. maximum

D. negative value

E. zero

3004. The horizontal component of buoyant force is__________________?
0

A. same as buoyant force

B. zero

C. negligible

D. non of these

3005. Choose the wrong statement___________________?
0

A. Center of pressure acts at a greater depth than center of gravity

B. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

C. The horizontal component acts through the center of pressure for the vertical projection

D. he vertical component passes through the center of pressure of the volume

E. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

3006. Ratio of inertia force to surface Jension is known as ________________________?
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A. Mach number

B. Webers number

C. Reynolds number

D. Froude number

E. none of the above

3007. A metal with specific gravity of o floating in a fluid of same specific gravity a will___________________?
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A. be fully immersed with top surface at fluid surface

B. partly immersed

C. sink to bottom

D. float over fluid

E. none of the above

3008. Operation of McLeod gauge used for low pressure measurement is based on the principle of_____________________?
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A. Pascals law

B. Boyles law

C. gas law

D. Charles law

E. McLeods law

3009. Dynamic viscosity of most of the liquids with rise in temperature____________________?
0

A. remains unaffected

B. none of the above

C. increases

D. decreases

E. unpredictable

3010. The atmospheric pressure with rise in altitude decreases____________________?
0

A. linearly

B. first steeply and then gradually

C. unpredictable

D. none of the above

E. first slowly and then steeply

3011. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than_______________?
0

A. 2.4 m above the hydraulic gradient

B. 10.0 m above the hydraulic gradient

C. 5.0 above the hydraulic gradient

D. none of the above

E. 6.4 m above the hydraulic gradient

3012. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as___________________?
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A. steady flow

B. one dimensional flow

C. turbulent flow

D. streamline flow

E. uniform flow

3013. Pressure of the order of 10? torr can be measured by_______________ ?
0

A. McLeod gauge

B. Pirani Gauge

C. ionisastion gauge

D. micro-manometer

E. Bourdon tube

3014. Cavitation will begin when______________________?
0

A. flow is increased

B. pressure is increased

C. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

D. pressure becomes more than critical pressure

E. none of the above

3015. The upper surface of a weir over which water flows is known is________________?
0

A. crest

B. contracta

C. sill

D. weir top

E. nappe

3016. The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as_________________?
0

A. streamline flow

B. turbulent flow

C. uniform flow

D. one dimensional flow

E. steady flow

3017. Choose the wrong statement ?
0

A. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

B. The center of buoyancy is located at the center of gravity of the displaced liquid

C. All floating bodies are stable

D. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

E. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy

3018. A streamline is defined as the line ________________?
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A. parallel to outer surface of pipe

B. of equal yelocity in a flow

C. which occurs in all flows

D. along which the pressure drop is uniform

E. parallel to central axis flow

3019. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?
0

A. 1 mm

B. 5 mm

C. 30 mm

D. 10 mm

E. 20 mm

3020. For pipes, turbulent flow occurs when Reynolds number is_________________?
0

A. none of the above

B. between 2000 and 4000

C. less than 4000

D. less than 2000

E. more than 4000

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