civil engineering Mcqs
6101. The region between the separation streamline and the boundary surface of the solid body is known as_________________?
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A. lift

B. wake

C. drag

D. boundary layer

E. aerofoil section

6102. 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

6103. 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

6104. 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

6105. 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
6106. 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
6107. 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

6108. 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

6109. 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

6110. 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

6111. 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

6112. 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
6113. 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

6114. 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

6115. 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

6116. 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

6117. 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

6118. 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
6119. 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
6120. 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

6121. 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
6122. At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_______________?
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A. minimum

B. zero

C. maximum

D. negative value

E. could be any value
6123. Bernoulli equation deals with the law of conservation of____________________?
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A. momentum

B. mass

C. force

D. energy

E. work

6124. A metal with specific gravity of o floating in a fluid of same specific gravity a will___________________?
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A. none of the above

B. partly immersed

C. be fully immersed with top surface at fluid surface

D. float over fluid

E. sink to bottom

6125. For hypersonic flow, the Mach number is___________________?
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A. unity

B. greater than 4

C. greater than unity

D. greater than 2

E. greater than 10

6126. Working principle of dead weight pressure gauge tester is based on __________________?
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A. Newtons law of viscosity .

B. Second law of thermodynamic

C. Pascals law

D. Daltons law of partial pressure

E. Avogadros hypothesis

6127. Mercury is often used in barometer because _________________?
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A. it is the best liquid

B. the height of barometer will be less

C. its vapour pressure is so low that it may be neglected

D. both B. and C.

E. it moves easily

6128. 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. turbulent flow

B. steady flow

C. one dimensional flow

D. streamline flow

E. uniform flow
6129. 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. 30 mm

C. 1 mm

D. 20 mm

E. 5 mm

6130. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is ap-proximately____________________?
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A. 20 mm

B. 1 mm

C. 10 mm

D. 30 mm

E. 5 mm

6131. The difference of pressure between the inside and outside of a liquid drop is_____________?
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A. = Txr

B. none of the above

C. p = 2T/r

D. p = T/2r

E. = T/r

6132. Capillary action is due to the__________________?
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A. cohesion of the liquid

B. none of the above

C. adhesion of the liquid molecules and the molecules on the surface of a solid

D. surface tension

E. all of the above
6133. The time oscillation of a floating body with increase in metacentric height will be________________?
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A. same

B. unpredictable

C. lower

D. lower/higher depending on weight of body

E. higher

6134. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as____________________?
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A. center of gravity

B. meta center

C. none of the above

D. center of buoyancy

E. center of pressure
6135. True one-dimensional 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 par-ticles, at any point, is the same at suc-cessive periods of time

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

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

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

6136. Hydrometer is used to determine________________?
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A. density

B. specific gravity of gases

C. specific gravity of solids

D. specific gravity of liquids

E. relative humidity

6137. If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water___________________?
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A. 52.2 cm

B. 50 cm

C. 51 cm

D. 51.7 cm

E. 52 cm

6138. According to Bernoullis equation for steady ideal fluid flow_______________?
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A. velocity and pressure are inversely proportional

B. the energy is constant along a stream-line but may vary across streamlines

C. principle of conservation of mass holds

D. total energy is constant throughout

E. none of the above

6139. Centre of pressure compared to e.g. is______________?
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A. above it

B. above or below depending on area of body

C. at same point

D. none of the above

E. below it
6140. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to___________________?
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A. head of water (h)

B. h3/1.

C. V/T

D. h2

E. h2

6141. The atmospheric pressure with rise in altitude decreases____________________?
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A. first steeply and then gradually

B. first slowly and then steeply

C. linearly

D. none of the above

E. unpredictable

6142. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
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A. 1:V5?

B. 1:25

C. 01:02.5

D. 1 : 5

E. 1 : 53/2

6143. Normal depth in open channel flow is the depth of flow corresponding to_______________?
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A. critical flow

B. uniform flow

C. unsteady flow

D. laminar flow

E. steady flow

6144. A body floats in stable equilibrium________________?
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A. when its e.g. is below its center of buoyancy

B. when the metancentre is above e.g

C. when its meatcentric height is zero

D. none of the above

E. metacentre has nothing to do with position of e.g. for determining stability

6145. The units of kinematic viscosity are_______________?
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A. newton-sec per meter

B. kg sec/meter

C. newton-sec per meter

D. none of the above

E. metres2 per sec
6146. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the______________?
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A. force of diffusion

B. force of friction

C. force of adhesion

D. force of cohesion

E. none of die above

6147. The line of action of the buoyant force acts through the centroid of the ___________________?
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A. volume of the floating body

B. submerged body

C. displaced volume of the fluid

D. none of the above

E. volume of the fluid vertically above the body

6148. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to_________________?
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A. tan 9

B. sin 9

C. sin 9

D. casS

E. cos 9

6149. For a body floating in a liquid the normal pressure exerted by the liquid acts at _________________?
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A. e.g. of the body

B. bottom surface of the body

C. all points on the surface of the body

D. metacentre

E. all of the above

6150. Flow occurring in a pipeline when a valve is being opened is ______________________?
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A. rotational

B. steady

C. vortex

D. laminar

E. unsteady