civil engineering MCQs – Page 306

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 Review each marked answer and report any item that may be outdated or unclear.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
6101. The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________?
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A. viscosity

B. co-efficient of viscosity

C. surface tension

D. osmosis

E. cohesion

6102. Buoyant force is___________________?
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A. the resultant force on a body due to the fluid surrounding it

B. force necessary to keep a body in equilibrium

C. none of the above

D. resultant force acting on a floating body

E. equal to the volume of liquid displaced

6103. Surface energy per unit area of a surface is numerically equal to___________________?
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A. force of adhesion

B. force of cohesion

C. surface tension

D. viscosity

E. atmospheric pressure

6104. Choose the wrong statement___________________?
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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. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

E. he vertical component passes through the center of pressure of the volume
6105. The units of dynamic or absolute viscosity are_______________?
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A. none of the above

B. metres2 per sec

C. kg sec/meter

D. newton-sec2 per meter

E. newton-sec per meter
6106. The resultant upward pressure of the fluid on an immersed body is called__________________?
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A. buoyancy

B. all the above are correct

C. upthrust

D. none of above is correct

E. center of pressure

6107. The normal stress is same in all directions at a point in a fluid ___________________?
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A. only when the fluid is incompressible and has zero viscosity

B. when there is no motion of one fluid layer relative to an adjacent layer

C. irrespective of the motion of one fluid layer relative to an adjacent layer

D. in case of an ideal fluid

E. only when the fluid is frictionless

6108. Cavitation will begin when______________________?
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A. none of the above

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

C. pressure is increased

D. flow is increased

E. pressure becomes more than critical pressure

6109. 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

6110. In an immersed body, center of pressure is ____________________?
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A. above the center of gravity

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

C. below be center of gravity

D. unpredictable

E. at the center of gravity

6111. Ratio of inertia force to elastic force is known as _____________________?
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A. Reynolds number

B. none of the above

C. Webers number

D. Froude number

E. Mach number
6112. Resultant pressure of the liquid in the case of an immersed body acts through _________________?
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A. metacentre

B. center of gravity

C. in between e.g. and center of pressure

D. center of pressure

E. center of buoyancy

6113. Two pipe systems can be said to be equivalent, when the following quantites are same______________?
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A. length and diameter

B. flow and length

C. friction loss and flow

D. friction factor and diameter

E. velocity and diameter

6114. The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream________________?
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A. keeps on decreasing

B. may increase/decrease

C. remains constant

D. keeps on increasing

E. unpredictable

6115. The two important forces for a floating body are___________________?
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A. buoyancy, pressure

B. inertial, gravity

C. buoyancy, inertial

D. buoyancy, gravity

E. gravity, pressure

6116. The resultant of all normal pressures acts_________________?
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A. at center of pressure

B. at metacentre

C. vertically downwards

D. vertically upwards

E. at e.g. of body

6117. Flow of water in a pipe about 3 meters in diameter can be measured by_________________?
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A. venturi

B. rotameter

C. nozzle

D. orifice plate

E. pitot tube
6118. Choose the wrong statement?
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A. Relative density of liquids can be determined by means of the depth of flotation of hydrometer

B. The point through which buoyant force acts, is called the center of buoyancy

C. any weight, floating or immersed in a liquid, is acted upon by a buoyant force

D. Buoyant force is equal to the weight of the liquid displaced

E. Center of buoyancy is located above the center of gravity of the displaced liquid v
6119. Reynolds number is significant in____________________?
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A. supersonics, as with projectile and jet propulsion

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

C. none of the above

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

E. all of the above

6120. A one dimensional flow is one which___________________?
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A. takes place in straight lines

B. takes place in one dimension

C. is uniform flow

D. is steady uniform flow

E. involves zero transverse component of flow