civil engineering MCQs – Page 290

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 Review each marked answer and report any item that may be outdated or unclear.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
5781. If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________?
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A. float

B. rise until its weight equals the buoyant force

C. none of the above

D. tend to move downward and it may finally sink
5782. The viscosity of a gas_______________?
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A. increases with increase in temperature

B. is independent of pressure for very high pressure intensities

C. decreases with increase in temperature

D. is independent of temperature

5783. The discharge over a broad crested weir is maximum when the depth of flow is_______________?
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A. 2 H/3

B. H/3

C. H/2

D. 2 H/5

5784. When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?
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A. inversely as the square of the radial distance

B. as the square of the radial distance

C. inversely as the radial distance

D. linearly with radial distance

5785. The unit of kinematic viscosity is_______________?
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A. dyne-sec/cm2

B. cm2/sec

C. gm/cm2-sec

D. gm/cm-sec2

5786. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is________________?
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A. 15 kN

B. 5kN

C. lOkN

D. 20 kN

5787. Coefficient of velocity of venturimeter_________________?
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A. none of the above

B. is equal to the coefficient of discharge of venturimeter

C. is independent of Reynolds number

D. decreases with higher Reynolds number

5788. When an ideal fluid flows past a sphere________________?
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A. lowest pressure intensity occurs at rear stagnation point

B. total drag is zero

C. lowest pressure intensity occurs at front stagnation point

D. highest intensity of pressure occurs around the circumference at right angles to flow

5789. The motion of air mass in a tornado is a________________?
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A. forced vortex at center and free vortex outside

B. free vortex at center and forced vortex outside

C. free vortex motion

D. forced vortex motion

5790. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________?
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A. always above the centroid of the area

B. none of the above

C. always below the centroid of the area

D. at the centroid of the submerged area

5791. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?
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A. 2/3 R

B. 1/3 R

C. 1/2 R

D. 3/4R

5792. With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on__________________?
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A. a circular disc of plate held normal to flow

B. a cylinder

C. a streamlined body

D. a sphere

5793. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________?
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A. 4.2m

B. 3.75 m

C. 4.5m

D. 4.0 m

5794. A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then________________?
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A. the bubble will move to the front

B. the bubble will move to the rear </strong>

C. the ball will move to the front

D. d out which of the above statements are correct ?

E. the ball will move to the rear

5795. The eddy viscosity for turbulent flow is______________?
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A. dependent on the flow

B. a function of temperature only

C. independent of the flow

D. a physical property of the fluid.

5796. The depth d below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
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A. 0.223 D

B. 0.707 D

C. 0.423 D

D. 0.577 D
5797. In a forced vortex motion, the velocity of flow is________________?
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A. directly proportional to the square of its radial distance from the axis of rotation

B. inversely proportional to its radial distance from the axis of rotation

C. inversely proportional to the square of its radial distance from the axis of rotation

D. directly proportional to its radial distance from axis of rotation
5798. In steady flow of a fluid, the total accele ration of any fluid particle______________?
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A. is independent of coordinates

B. is never zero

C. can be zero

D. is always zero

5799. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be________________?
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A. 10 kN/m2

B. 12 kN/m2

C. 4 kN/m2

D. 14 kN/m2
5800. The pitot tube is used to measure________________?
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A. stagnation pressure

B. velocity at stagnation point

C. dynamic pressure

D. static pressure