civil engineering MCQs – Page 238

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 Review each marked answer and report any item that may be outdated or unclear.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
4741. The property of the ingredients to separate from each other while placing the concrete is called____________?
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A. shrinkage

B. segregation

C. bulking

D. compaction

4742. Minimum thickness of load bearing RCC wall should be_____________?
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A. 100 mm

B. 50 mm

C. 150 mm

D. 200 mm

4743. The diameter of ties in a column should be_______________?
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A. more than or equal to 5 mm

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

C. more than 5 mm but less than one-fourth of diameter of main bar

D. more than 5 mm and also more than one-fourth of diameter of main bar
4744. If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called________________?
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A. over-reinforced beam

B. balanced beam

C. none of the above

D. under-reinforced beam

4745. Air entrainment in the concrete increases________________?
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A. strength

B. the unit weight

C. workability

D. the effects of temperature variations

4746. In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by_______________?
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A. 10%

B. 40%

C. 30%

D. 20%

4747. To determine the modulus of rupture, the size of test specimen used is_______________?
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A. 100 x100 x700 mm

B. 150 x150 x700 mm

C. 100 x100 x500 mm

D. 150 x150 x500 mm

4748. 1% of voids in a concrete mix would reduce its strength by about______________?
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A. 20%

B. 5%

C. 15%

D. 10%

4749. For a reinforced concrete section, the shape of shear stress diagram is_______________?
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A. wholly rectangular

B. parabolic above neutral axis and rectangular below neutral axis

C. wholly parabolic

D. rectangular above neutral axis and parabolic below neutral axis

4750. As compared to ordinary portland cement, use of pozzuolanic cement_______________?
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A. increases shrinkage

B. reduces workability

C. increases strength

D. increases bleeding

4751. The limits of percentage p of the longitudinal reinforce-ment in a column is given by_____________?
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A. 0.15% to 2%

B. 0.8% to 4%

C. 0.8% to 8%

D. 0.8% to 6%
4752. For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankines theory_______________?
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A. is always greater than 1

B. can be less than 1

C. is always less than 1

D. can be more than 1

4753. For walls, columns and vertical faces of all structural members, the form work is generally removed after______________?
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A. 24 to 48 hours

B. 7 days

C. 14 days

D. 3 days

4754. For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be________________?
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A. above 0.92

B. 0.75-0.80

C. 0.80-0.85

D. 0.85 0.92

4755. The average permissible stress in bond for plain bars in tension is_______________?
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A. increased by 25% for bars in compression

B. decreased by 10% for bars in compression

C. decreased by 25% for bars in compression

D. increased by 10% for bars in compression

4756. Admixtures which cause early setting, and hardening of concrete are called_______________?
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A. retarders

B. accelerators

C. workability admixtures

D. air entraining agents

4757. For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be________________?
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A. 900 mm

B. 750 mm

C. more than 1 m

D. 600 mm

4758. Increase in the moisture content in concrete_________________?
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A. all of the above

B. does not change the strength

C. reduces the strength

D. increases the strength

4759. As compared to ordinary portland cement, high alumina cement has______________?
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A. higher initial setting time but lower final setting time

B. lower initial and final setting times

C. lower initial setting time but higher final setting time

D. higher initial and final setting times

4760. To minimise the effect of differential settlement, the area of a footing should be designed for______________?
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A. live load + fraction of dead load

B. dead load only

C. dead load + live load

D. dead load + fraction of live load