civil engineering MCQs – Page 53

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 Review each marked answer and report any item that may be outdated or unclear.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
1041. The boundary layer thickness in turbulent flow varies as______________?
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A. x,/2

B. x4/5

C. x3/5

D. x7

1042. y/n) (1 a l/r), is For calculating the allowable stress of long columns. The empirical formula 0 known as_________________?
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A. Rankines formula

B. Parabolic formula

C. Perrys formula

D. Straight line formula
1043. Pick up the correct statement from the following?
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A. In a loaded beam, the moment at which the first yield occurs is called yield moment

B. In a loaded beam, the moment at which the entire section of the beam becomes fully plastic, is called plastic moment

C. All the above

D. In a fully plastic stage of the beam, the neutral axis divides the section in two sections of equal area

1044. An isolated load W is acting at a distance a from the left hand support, of a three hinged arch of span 2l and rise h hinged at the crown, the horizontal reaction at the support, is_________________?
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A. 2h/Wa

B. Wa/h

C. Wa/2h

D. 2W/ha

1045. When an ideal fluid flows past a sphere________________?
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A. lowest pressure intensity occurs at rear stagnation point

B. lowest pressure intensity occurs at front stagnation point

C. total drag is zero

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

1046. The motion of air mass in a tornado is a________________?
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A. free vortex motion

B. free vortex at center and forced vortex outside

C. forced vortex motion

D. forced vortex at center and free vortex outside
1047. The forces acting on the bar as shown in the given figure introduce________________?
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A. Shear stress

B. Tensile stress

C. Compressive stress

D. None of these

1048. If Ix and Iy are the moments of inertia of a section about X and Y axes, the polar moment of inertia of the section, is_________________?
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A. (I /I )

B. (IX IY)/2

C. (IX + IY)/2

D. IX + IY
1049. The point of contraflexure is the point where_______________?
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A. S.F. is zero

B. B.M. is maximum

C. B.M. is minimum

D. B.M. changes sign
1050. The strain energy due to volumetric strain________________?
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A. All the above

B. Is directly proportional to the square of exerted pressure

C. Is inversely proportional to Bulk modulus

D. Is directly proportional to the volume

1051. The equivalent length is of a column of length having both the ends fixed, is_________________?
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A. 2 L

B. L

C. L

D. L/2
1052. Ay between two stream lines represents________________?
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A. pressure

B. velocity

C. discharge

D. head

1053. The ratio of lateral strain to axial strain of a homogeneous material, is known___________________?
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A. Yield ratio

B. Poissons ratio

C. Plastic ratio

D. Hookes ratio

1054. At yield point of a test piece, the material__________________?
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A. Undergoes plastic deformation

B. Behaves in an elastic manner

C. Regains its original shape on removal of the load

D. Obeys Hookes law

1055. A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm2and that of brass bar is 3000 mm2. These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm2 and Eb = 0.1 MN/mm2, the stresses developed are___________________?
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A. b = 6 N/mm2 s = 12 N/mm2

B. b = 8 N/mm2 s = 16 N/mm2

C. b = 10 N/mm2 s = 20 N/mm 2

D. b = 5 N/mm2 s = 10 N/mm2

1056. static equations i.e. H V M = 0, to a determinate structure, we may By applying the determine_________________?
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A. Shear forces only

B. All the above

C. Bending moments only

D. Supporting reactions only

1057. The equivalent length of a column of length L having one end fixed and the other end free, is______________?
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A. L

B. L/2

C. 2L

D. L

1058. If and are external and internal diameters of a circular shaft respectively, its polar moment of inertia, is________________?
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A. D4 d4)

B. D4 d4)

C. D4 d4)

D. D4 d4)
1059. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?
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A. 1.5 m/sec

B. 1 m/sec

C. less than 1 m/sec

D. 2 m/sec

1060. The unit of work or energy in S.I. units is________________?
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A. watt

B. pascal

C. kilogram meter

D. newton

E. joule