civil engineering MCQs – Page 46

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 Review each marked answer and report any item that may be outdated or unclear.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

901. If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is_______________?
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A. 55

B. 45

C. 50

D. 40

902. Which of the following is not the unit of energy________________?
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A. kg m x (m/sec)2

B. watt hours

C. kg m

D. kcal

E. wattr

903. Total pressure on the vertical face of a retaining wall of height h acts parallel to free surface and from the base at a distance of_____________________?
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A. 2h/3

B. h/2

C. h/3

D. h /4

904. Which is the correct statement about law of polygon of forces ?
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A. if a polygon representing forces acting at a point is closed then forces are in equilibrium

B. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

C. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

D. if any number of forces acting at a point can be represented by the sides

E. a polygon taken in order, then the forces are in equilibrium

F. none of the above

905. If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least________________?
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A. WL/3P

B. WL /P

C. WL/4P

D. WL/2P

906. For stairs spanning horizontally, the minimum waist provided is________________?
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A. 6 cm

B. 12 cm

C. 4 cm

D. 8 cm

907. The maximum shear stress (q) in concrete of a reinforced cement concrete beam is_____________?
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A. Lever arm/(Shear force Width)

B. Shear force/(Lever arm Width)

C. Width/(Lever arm Shear force)

D. (Shear force Width)/Lever arm

908. In a cantilever retaining wall without a heel slab______________?
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A. Width of the base slab is kept 0.7 time the total height of the wall

B. Base slab is made 10 cm thicker than the stem

C. Thickness of the stem is kept same throughout

D. All the above

909. The diameter of main bars in R.C.C. columns, shall not be less than________________?
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A. 12 mm

B. 6 mm

C. 8 mm

D. 10 mm

910. A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is____________________?
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A. Atft (d n/3)

B. bn (fc/2) (d n/3)

C. n1 (1 n1/3) cbd

D. All the above

911. The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or____________________?
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A. 24 bar diameters

B. 30 bar diameters

C. 18 bar diameters

D. 12 bar diameters

912. Distribution reinforcement in a simply supported slab, is provided to distribute_______________?
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A. Temperature stress

B. All the above

C. Load

D. Shrinkage stress

913. A simply supported beam 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm2, the area of steel required, is___________________?
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A. 17 cm2

B. 16 cm2

C. 15 cm2

D. 14 cm 2

914. If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width_______________?
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A. T R

B. R + T

C. 2 + T2)

D. R T

915. Steel beam theory is used for_______________?
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A. Doubly reinforced beams ignoring compressive stress in concrete

B. Steel beams encased in concrete

C. Design of simple steel beams

D. Beams if shear exceeds 4 times allowable shear stress

916. A short column 20 cm 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2, the Safe load on the column, should not exceed_______________?
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A. 4120 kg

B. 41,200 kg

C. 412,000 kg

D. None of these

917. If Sb, is the average bond stress on a bar of diameter subjected to maximum stress , the length of the embedment is given by_____________?
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A. l = dt/4Sb

B. l = dt/3Sb

C. l = dt/Sb

D. l = dt/2Sb

918. Which one of the following statements is not correct_________________?
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A. the sine of the angle of repose is equal to coefficient to friction

B. the tangent of the angle of friction is equal to coefficient of friction

C. the tangent of the angle of repose is equal to coefficient of friction

D. none of the above

E. the angle of repose is equal to angle of friction

919. If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is_____________?
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A. 2300/2C

B. 2800/C

C. 2800/3C

D. 2800/C2

920. effective depth and depth of the neutral axis respectively of a singly reinforced If d and n are the beam, the lever arm of the beam, is_________________?
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A. n

B. d + n/3

C. d n/3

D. d

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