civil engineering MCQs – Page 148

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 Review each marked answer and report any item that may be outdated or unclear.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
2941. For detecting the nitrates in sewage, the colour may be developed by adding________________?
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A. Phenol-di -sulphuric acid and potassium hydroxide

B. None of these

C. Sulphuric acid and napthamine

D. Potassium permanganate

2942. Uniform flow occurs when___________________?
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A. the magnitude and direction of the velocity do not change from point to point in the fluid

B. the velocity of successive fluid pai-ticles, at any point, is the same at successive periods of time

C. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plsr.e

D. the direction and magnitude of the velocity at all points are identical

E. velocity, depth, pressure, etc. change from point to point in the fluid flow

2943. A large Roynold number is indication of_________________?
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A. steady flow

B. highly turbulent flow

C. turbulent flow

D. laminar flow

E. smooth and streamline flow

2944. The fluid forces considered in the Navier Stokes equation are__________________?
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A. gravity, viscous and turbulent

B. none of the above

C. pressure, viscous and turbulent

D. gravity, pressure and viscous

E. gravity, pressure and turbulent

2945. Non uniform flow occurs when ____________________?
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A. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

C. the direction and magnitude of the velocity at all points are identical

D. velocity, depth, pressure, etc. change from point to point in the fluid flow

E. the magnitude aricf direction of the velocity do not change from point to point in the fluid

2946. In an immersed body, center of pressure is ____________________?
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A. at the center of gravity

B. unpredictable

C. below be center of gravity

D. could be above or below e.g. depending on density of body and liquid

E. above the center of gravity

2947. Pitot tube is used for measurement of__________________?
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A. pressure

B. flow

C. velocity

D. dsscharge

E. viscosity

2948. The minimum width of the fire escape stairs shall be?
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A. 2.0 m

B. 1.25 m

C. 1.00 m

D. 1.5 m

2949. The difference of pressure between the inside and outside of a liquid drop is_____________?
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A. none of the above

B. = T/r

C. = Txr

D. p = 2T/r

E. p = T/2r

2950. The vapour pressure over the concave surface is________________?
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A. less man the vapour pressure over the plane surface

B. zero

C. equal to the vapour pressure over the plane surface

D. greater than the vapour pressure over the plane surface

E. none of the above

2951. True one-dimensional flow occurs when___________________?
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A. velocity, depth, pressure etc. change from point to point in the fluid flow

B. the magnitude and direction of the velocity do not change from point to point in the fluid

C. the direction and magnitude of the veiocity at all points are identical

D. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

E. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

2952. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to________________?
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A. 9810 Pa

B. 91Pa

C. 98,100 Pa

D. 1 Pa

E. 981 Pa

2953. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is ap-proximately_______________?
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A. 10 mm

B. 5 mm

C. 20 mm

D. 1 mm

E. 30 mm
2954. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal__________________?
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A. ratio of inertial force to force due to gravitation

B. all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

C. ratio of inertial force to force due to surface tension

D. ratio of inertial force to force due to viscosity

2955. Dynamic viscosity of most of the gases with rise in temperature___________________?
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A. unpredictable

B. none of the above

C. remains unaffected

D. increases

E. decreases

2956. Mach number is significant in___________________?
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A. supersonics, as with projectiles and jet propulsion

B. none of the above

C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ships hulls

D. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

E. all of fhe above

2957. Flow occurring in a pipeline when a valve is being opened is ______________________?
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A. unsteady

B. rotational

C. steady

D. laminar

E. vortex

2958. Eulers dimensionless number relates the following_______________?
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A. viscous force and buoyancy force

B. viscous force and inertial force

C. pressure force and viscous force

D. pressure force and inertial force

E. inertial force and gravity

2959. The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called___________________?
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A. upthrust

B. reaction

C. center of pressure

D. metacentre

E. buoyancy
2960. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is__________________?
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A. none of the above

B. 0.6

C. 0.3

D. 0.83

E. 0.4