civil engineering Mcqs
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

2961. Choose the wrong statement?
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A. when in equilibrium, fluids can sustain shear forces

B. fluids are capable of flowing

C. fluids have some degree of compressibility and offer little resistance to form

D. when in equilibrium, fluids cannot sustain tangential forces

E. fluids conform to the shape of the con-taining vessels

2962. Center of buoyancy is the___________________?
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A. does not exist

B. center of pressure of displaced volume

C. e.g. of floating body

D. none of the above

E. centroid of the displaced volume of fluid
2963. Which of the following manometer has highest sensitivity __________________?
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A. micro-manometer with water

B. U-tube with water

C. inclined U-tube

D. displacement type

E. U-tube with mercury

2964. 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. 01:02.5

B. 1:V5?

C. 1:25

D. 1 : 5

E. 1 : 53/2

2965. The continuity equation is connected with_______________?
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A. viscous/unviscous fluids

B. open channel/pipe flow

C. compressibility of fluids

D. steady/unsteady flow

E. conservation of mass
2966. Rotameter is a device used to measure____________________?
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A. flow

B. absolute pressure

C. rotation

D. velocity of fluid

E. velocity of air

2967. When a body floating in a liquid, is displaced slightly, it oscillates about ___________________?
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A. liquid surface

B. center of pressure

C. metacentre

D. e.g. of body

E. center of buoyancy

2968. The process of diffusion of one liquid into the other through a semi-permeable membrane is called _______________?
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A. surface tension

B. cohesion

C. viscosity

D. osmosis

E. diffusivity

2969. The time oscillation of a floating body with increase in metacentric height will be________________?
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A. unpredictable

B. lower/higher depending on weight of body

C. same

D. lower

E. higher

2970. The units of dynamic or absolute viscosity are_______________?
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A. metres2 per sec

B. none of the above

C. newton-sec per meter

D. kg sec/meter

E. newton-sec2 per meter

2971. Uniform flow occurs when____________________?
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A. flow occurs at constant fate

B. size and cross section change uniformly along length

C. the flow is steady

D. size and shape of the cross section in a particular length remain constant

E. the flow is streamline

2972. 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

2973. An open vessel of water is accelerated up an inclined plane. The free water surface will___________________?
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A. make an angle in direction of inclination of inclined plane

B. none of the above

C. make an angle in opposite direction to inclination of inclined plane

D. be horizontal

E. any one of above is possible

2974. The resultant of all normal pressures acts_________________?
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A. at center of pressure

B. vertically downwards

C. at e.g. of body

D. at metacentre

E. vertically upwards
2975. Choose the wrong statement________________?
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A. Viscosity of liquids is appreciably affected by change in pressure

B. Viscosity is expressed as poise, stoke, or saybolt seconds

C. Viscosity is due primarily to interaction between fluid molecules

D. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

E. Viscosity of liquids decreases with in-crease in temperature

2976. For a floating body to be in stable equilibrium, its metacentre should be_________________ ?
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A. between e.g. and center of pressure

B. below the center of buoyancy

C. above the center of buoyancy

D. below the center of gravity

E. above the center of gravity
2977. 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 adhesion

B. force of diffusion

C. force of friction

D. none of die above

E. force of cohesion
2978. In order that flow takes place between two points in a pipeline, the differential pressure between thes^ points must be more than_________________?
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A. all of the above

B. none of the above

C. viscosity

D. surface friction

E. frictional force

2979. For hypersonic flow, the Mach number is___________________?
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A. unity

B. greater than 10

C. greater than 4

D. greater than unity

E. greater than 2

2980. The speed of sound in a ideal gas varies directly as its ______________?
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A. temperature

B. pressure

C. absolute temperature

D. density

E. modulus of elasticity

2981. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of_________________?
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A. 1.2

B. 1.25

C. 0.8

D. 0.75

E. 1

2982. In a free vortex motion, the radial component of velocity everywhere is ________________?
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A. unpredictable

B. maximum

C. non-zero and finite

D. minimum

E. zero
2983. 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. remains constant

B. unpredictable

C. may increase/decrease

D. keeps on decreasing

E. keeps on increasing

2984. 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. cos 9

B. sin 9

C. casS

D. tan 9

E. sin 9

2985. The two important forces for a floating body are___________________?
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A. buoyancy, gravity

B. gravity, pressure

C. buoyancy, pressure

D. buoyancy, inertial

E. inertial, gravity

2986. Working principle of dead weight pressure gauge tester is based on __________________?
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A. Avogadros hypothesis

B. Pascals law

C. Second law of thermodynamic

D. Newtons law of viscosity .

E. Daltons law of partial pressure

2987. The normal stress is same in all directions at a point in a fluid ___________________?
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A. only when the fluid is frictionless

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 incompressible and has zero viscosity

2988. If the surface of liquid is convex, men_________________?
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A. cohesion pressure is increased

B. cohesion pressure is negligible

C. there is no cohesion pressure

D. cohesion pressure is decreased

E. none of the above

2989. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if __________________?
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A. the area is vertical

B. all of the above

C. none of the above

D. the area is horizontal

E. the area is inclined

2990. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is __________________?
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A. 9,000 kg

B. 18,000 kg

C. 30,000 kg

D. 13,500 kg

E. 27,000 kg

2991. The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________?
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A. cohesion

B. surface tension

C. co-efficient of viscosity

D. viscosity

E. osmosis

2992. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea_________________?
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A. Venturimeter

B. pitot tube

C. rotameter

D. hot wire anemometer

E. Orifice plate

2993. Which of the following instrument can be used for measuring speed of an aeroplane ________________?
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A. Venturimeter

B. hot wire anemometer

C. pitot tube

D. Orifice plate

E. rotameter

2994. Metacentre is the point of intersection of _________________________?
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A. buoyant force and the center line of body

B. none of the above

C. all of the above

D. mid point between e.g. and center of buoyancy

E. vertical upward force through e.g. of body and center line of body

2995. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is ______________________?
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A. 2.5 m

B. 2.4 m

C. 5.0 m

D. 3.0 m

E. 4.0 m

2996. For pipes, laminar flow occurs when Roynolds number is__________________?
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A. between 2000 and 4000

B. more than 4000

C. less than 4000

D. none of the above

E. less than 2000
2997. Ratio of inertia force to elastic force is known as _____________________?
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A. Webers number

B. Reynolds number

C. Froude number

D. Mach number

E. none of the above

2998. The region between the separation streamline and the boundary surface of the solid body is known as_________________?
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A. drag

B. wake

C. boundary layer

D. lift

E. aerofoil section

2999. During the opening of a valve in a pipe line, the flow is___________________?
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A. steady

B. free vortex type

C. uniform

D. laminar

E. unsteady
3000. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be ___________________?
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A. 8000 kg

B. 4000 kg

C. 16000 kg

D. 1000 kg

E. 2000 kg