civil engineering MCQs – Page 49

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 Review each marked answer and report any item that may be outdated or unclear.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
961. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?
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A. between 1 and 100

B. 160

C. less than 1

D. 200

962. Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as________________?
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A. Indeterminate beams

B. Determinate beams

C. Composite beams

D. Compound beams

963. Hot wire anemometer is used to measure_______________?
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A. pressure intensity of gas

B. pressure intensity of liquid

C. discharge

D. velocity of gas
964. The ratio of the deflections of the free end of a cantilever due to an isolated load at 1/3rd and 2/3rd of the span, is________________?
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A. 7-Mar

B. 7-Jan

C. 5-Feb

D. 2/7
965. The ratio of maximum shear stress to average shear stress of a circular beam, is________________?
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A. 4-Mar

B. 3-Feb

C. 2-Mar

D. 4/3
966. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?
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A. 3-Feb

B. 4-Jan

C. 2-Jan

D. 1/3
967. For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is________________?
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A. 0.707

B. 0.505

C. 0.303

D. 0.404

968. According to principle of moments_________________?
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A. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

B. none of the above

C. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

D. positive and negative couples can be balanced

E. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

969. The ratio of limiting friction and normal reaction is known as_______________?
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A. coefficient of friction

B. angle of repose

C. sliding friction

D. friction resistance

E. angle of friction

970. The hydraulic grade line is_________________?
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A. never above the energy grade line

B. all of the above

C. always above the centre line of pipe

D. always sloping downward in the direction of flow

971. If a solid shaft (diameter 20 cm, length 400 cm, N = 0.8 105 N/mm2) when subjected to a twisting moment, produces maximum shear stress of 50 N/mm 2, the angle of twist in radians, is_________________?
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A. 0.001

B. 0.0025

C. 0.003

D. 0.002

972. For calculating the permissible stress 0 y /[(1 + a(l/r)] is the empirical formula, known as__________________?
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A. Perrys formula

B. Rankines formula

C. Straight line formula

D. Parabolic formula

973. A load of 1960 N is raised at the end of a steel wire. The minimum diameter of the wire so that stress in the wire does not exceed 100 N/mm2 is________________?
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A. 5.0 mm

B. 4.0 mm

C. 4.5 mm

D. 5.5 mm

974. 0. At its elastic limit, the following statement is true, 0/E__________________?
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A. Strain energy = 0

B. All the above

C. Strain is equal to

D. Maximum shear stress = /2

E. /2E volume

975. A compound truss may be formed by connecting two simple rigid frames, by_________________?
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A. Three bars intersecting at a point

B. Two bars

C. Three parallel bars

D. Three bars
976. For beams breadth is constant__________________?
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A. Depth d 3

B. Depth d

C. Depth d 1/M

D. Depth d M

977. A steel plate d b is sandwiched rigidly between two timber joists each D B/2 in section. The steel will be (where Youngs modulus of steel is m times that of the timber)_________________?
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A. BD + mbd3)/4D]

B. BD + mbd)/4D]

C. BD3 + mbd3)/6D]

D. BD + mbd)/6D]

978. The ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar, is__________________?
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A. 1

B. 4-Jan

C. 2-Jan

D. 2
979. The locus of the end point of the resultant of the normal and tangential components of the stress on an inclined plane, is________________?
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A. Straight line

B. Circle

C. Parabola

D. Ellipse
980. For laminar flow in circular pipes, the Darcys friction factor f is equal to_________________?
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A. 16/Re

B. 64/ Re

C. 32/ Re

D. none of the above where R,, is Reynolds number