civil engineering MCQs – Page 34

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 Review each marked answer and report any item that may be outdated or unclear.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
661. A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is__________________?
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A. none of the above

B. 40 mm

C. 20 mm

D. 10 mm
662. According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is____________?
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A. 7

B. 0 < PI < 7

C. 17<PI27

663. The maximum dry density upto which any soil can be compacted depends upon____________?
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A. moisture content only

B. amount of compaction energy only

C. both moisture content and amount of compaction energy

D. none of the above

664. According to IS: 456-1978, the maximum reinforcement in a column is_____________?
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A. 8%

B. 2%

C. 4%

D. 6 %
665. An R.C.C. beam of 6 m span is 30 cm wide and has a lever arm of 55 cm. If it carries a U.D.L. of 12 t per m and allowable shear stress is 5 kg/cm2, the beam________________?
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A. Is safe with stirrups

B. Needs revision of section

C. Is safe in shear

D. Is safe with stirrups and inclined bars

666. The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on______________?
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A. top face perpendicular to wall

B. bottom face perpendicular to wall

C. both top and bottom faces perpendicular to wall

D. none of the above

667. If the permeability of a soil is 0.8 mm/sec, the type of soil is_______________?
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A. sand

B. clay

C. silt

D. gravel

668. If the sand in-situ is in its densest state, then the relative density of sand is_____________?
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A. between 0 and 1

B. 1

C. zero

D. greater than 1

669. The effect of cohesion on a soil is to______________?
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A. reduce both the active earth pressure intensity and passive earth pressure intensity

B. increase both the active earth pressure intensity and passive earth pressure intensity

C. reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity

D. increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity

670. The admixture of coarser particles like sand or silt to clay causes______________?
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A. decrease in liquid limit and increase in plasticity index

B. decrease in liquid limit and no change in plasticity index

C. decrease in both liquid limit and plasticity index

D. increase in both liquid limit and plasticity index

671. Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability__________________?
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A. increases by 50%

B. increases by 25%

C. decreases by 33.3%

D. increases by 33.3%

672. The minimum thickness of a flat slab is taken_________________?
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A. L/32 for end panels without drops

B. L/36 for end panels without drops

C. L/36 for interior panels without drop

D. All the above
673. While designing the pile as a column, the end conditions are nearly_______________?
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A. both ends hinged

B. both ends fixed

C. one end fixed and other end hinged

D. one end fixed and other end free

674. Compressibility of sandy soils is______________?
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A. much greater than that of clayey soils

B. almost equal to that of clayey soils

C. much less than that of clayey soils

D. none of the above

675. Residual soils are formed by______________?
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A. wind

B. none of the above

C. water

D. glaciers

676. The self-weight of the footing, is_____________?
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A. Not considered for calculating the upward pressure on footing

B. Also considered for calculating the upward pressure on footing

C. Not considered for calculating the area of the footing

D. Both B. and C

677. The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing_______________?
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A. cohesion and effective angle of shearing resistance

B. effective angle of shearing resistance

C. cohesion and effective unit weight of soil

D. effective unit weight of soil and effective angle of shearing resistance

678. High carbon content in the steel causes_______________?
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A. decrease in tensile strength but increase in ductility

B. increase in tensile strength but decrease in ductility

C. decrease in both tensile strength and ductility

D. increase in both tensile strength and ductility

679. A higher modular ratio shows____________?
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A. higher tensile strength of steel

B. higher compressive strength of con-crete

C. lower compressive strength of concrete

D. lower tensile strength of steel

680. The diameter of ties in a column should be_______________?
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A. more than 5 mm but less than one-fourth of diameter of main bar

B. more than or equal to 5 mm

C. more than or equal to one fourth of diameter of main bar

D. more than 5 mm and also more than one-fourth of diameter of main bar