civil engineering Mcqs
3001. Surface energy per unit area of a surface is numerically equal to___________________?
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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______________?
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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_______________?
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A. minimum

B. could be any value

C. maximum

D. negative value

E. zero

3004. The horizontal component of buoyant force is__________________?
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A. same as buoyant force

B. zero

C. negligible

D. non of these

3005. 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. 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____________________?
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A. remains unaffected

B. none of the above

C. increases

D. decreases

E. unpredictable

3010. The atmospheric pressure with rise in altitude decreases____________________?
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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_______________?
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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_______________ ?
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A. McLeod gauge

B. Pirani Gauge

C. ionisastion gauge

D. micro-manometer

E. Bourdon tube

3014. Cavitation will begin when______________________?
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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________________?
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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_________________?
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A. streamline flow

B. turbulent flow

C. uniform flow

D. one dimensional flow

E. steady flow

3017. Choose the wrong statement ?
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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____________________?
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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_________________?
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A. none of the above

B. between 2000 and 4000

C. less than 4000

D. less than 2000

E. more than 4000
3021. Normal depth in open channel flow is the depth of flow corresponding to_______________?
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A. uniform flow

B. laminar flow

C. unsteady flow

D. critical flow

E. steady flow

3022. The flow in which each liquid particle has a definite path and their paths do not cross each other is called____________________?
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A. turbulent flow

B. streamline flow

C. steady flow

D. uniform flow

E. one dimensional flow

3023. Center of pressure on an inclined plane is______________________?
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A. above the centroid

B. at center of pressure

C. at metacentre

D. below the centroid

E. at the centroid

3024. Principle of similitude forms the basis of__________________?
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A. designing models so that the result can be converted to prototypes

B. hydraulic designs

C. comparing two identical equipments

D. performing acceptance tests

E. comparing similarity between design and actual equipment

3025. In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
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A. F between W and P

B. W between P and F

C. P between W and F

D. none of the above

E. W, P and F all on one side

3026. The vapour pressure over the concave surface is__________________?
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A. none of the above

B. equal to the vapour pressure over the plane surface

C. zero

D. greater than the vapour pressure over the plane surface

E. less man the vapour pressure over the plane surface
3027. 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 cohesion

B. force of friction

C. none of die above

D. force of diffusion

E. force of adhesion

3028. The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will_______________?
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A. may increase or decrease depending on the characteristics of liquid

B. increase

C. remain unaffected

D. decrease

E. unpredictable

3029. A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
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A. 4 (225)1/3 minutes

B. 4 x V225 minutes

C. 4 minutes

D. 900 minutes

E. 4 x (225)3/2 minutes

3030. Choose the wrong statement?
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A. any weight, floating or immersed in a liquid, is acted upon by a buoyant force

B. Relative density of liquids can be determined by means of the depth of flotation of hydrometer

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

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

E. Center of buoyancy is located above the center of gravity of the displaced liquid v
3031. In the case of steady flow of a fluid, the acceleration of any fluid particle is__________________?
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A. variable

B. zero under limiting conditions

C. never zero

D. constant

E. zero
3032. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
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A. 250 m/sec

B. 25 m/sec

C. 2 m/sec

D. 10 m/sec

E. 50 m/sec

3033. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is__________________?
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A. 5

B. 6

C. 7

D. 1

3034. Newtons law of viscosity is a relationship between________________?
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A. shear stress, pressure and rate of angular distortion

B. shear stress anctthejiate of angular distortion

C. pressure, velocity and viscosity

D. shear stress, velocity and viscosity

E. shear stress and viscosity

3035. According to Bernoullis equation for steady ideal fluid flow_______________?
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A. velocity and pressure are inversely proportional

B. none of the above

C. principle of conservation of mass holds

D. total energy is constant throughout

E. the energy is constant along a stream-line but may vary across streamlines
3036. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to __________________?
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A. the weight of the body

B. weight of body plus the weight of the fluid displaced hy the body

C. less than the weight of the body

D. more than the weight of the body

E. weight of the fluid displaced by the body
3037. Flow of water in a pipe about 3 meters in diameter can be measured by_________________?
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A. rotameter

B. orifice plate

C. nozzle

D. pitot tube

E. venturi

3038. General energy equation holds for_________________?
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A. turbulent flow

B. steady flow

C. non-uniform flow

D. laminar flow

E. all of the above

3039. An ideal flow of any fluid must satisfy ___________________?
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A. boundary layer theory

B. Pascal law

C. continuity equation

D. Newtons law of viscosity

E. Bernoullis theorem

3040. Steady flow occurs when____________________?
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A. the direction and magnitude of the velocity at all points are identical

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

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

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

3041. Metacentric height is the distance between the metacentre and___________________?
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A. water surface

B. center of buoyancy

C. center of gravity

D. center of pressure

E. none of the above

3042. The equation of continuity holds good when the flow __________________?
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A. is one dimensional

B. is steady

C. none of the above

D. all of the above

E. velocity is uniform at all the cross sec-tions

3043. In an isothermal atmosphere, the pressure__________________?
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A. decreases linearly with elevation

B. unpredictable

C. varies in the same way as the density

D. remains constant

E. increases exponentially with elevation

3044. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm, the pressure at a depth of 50 m below the oil surface will be _____________________?
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A. 6 meters of water Column

B. 3 meters of water column

C. 5 meters of water column

D. 2 meters of water column

E. 7 meters of water column

3045. Select the correct statement ?
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A. Local atmospheric pressure depends upon elevation of locality only

B. Gauge piessure is equal to atmospheric pressure plus instrument reading

C. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

D. A barometer reads the difference be-tween local and standard atmospheric pressure

E. Local atmospheric pressure is always below standard atmospheric pressure

3046. Capillary action is due to the__________________?
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A. adhesion of the liquid molecules and the molecules on the surface of a solid

B. none of the above

C. surface tension

D. all of the above

E. cohesion of the liquid

3047. Rain drops are spherical because of____________________?
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A. viscosity

B. atmospheric pressure

C. surface tension forces

D. air resistance

E. none of the above

3048. Buoyant force is___________________?
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A. the resultant force on a body due to the fluid surrounding it

B. equal to the volume of liquid displaced

C. force necessary to keep a body in equilibrium

D. none of the above

E. resultant force acting on a floating body

3049. For a floating body to be in equilibrium __________________?
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A. none of the above

B. all of the above

C. meta center should be above e.g.

D. center of buoyancy and e.g. must lie on same vertical plane

E. a righting couple should be formed

3050. Liquids transmit pressure equally in all the directions. This is according to_________________?
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A. Boyles law

B. Newtons formula

C. Chezys equation

D. Archimedes principle

E. Pascals law