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Design of Concrete Structures MCQs

Free 137+ Design of Concrete Structures MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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137 questions in this list. Select an option to practice, or open a question for the full page with explanation.

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Design of Concrete Structures

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1.Which of the following statements is accurate?

The elastic modulus of high tensile steel closely matches that of mild steel.High tensile steel has a higher elastic modulus compared to mild steel.The carbon content in high carbon steel is lower than in mild steel.High tensile steel is more cost-effective than mild steel.

2.Which of the following statements is incorrect?

Prestress losses occur more significantly in the pretensioning method compared to the post-tensioning method.The pretensioning technique offers higher reliability regarding its long-term durability.For structures with heavy loads and long spans, such as bridges or buildings, the post-tensioning approach is more cost-effective than pretensioning.None of the above statements are incorrect.

3.For a ring beam under a uniformly distributed load, which of the following statements are true?

Shear force at mid-span is zero and torsion at mid-span is zeroShear force at mid-span is zero and torsion at mid-span is maximumShear force at mid-span is maximum and torsion at mid-span is zeroShear force at mid-span is maximum and torsion at mid-span is maximum

4.What are the effects of the settlement of an intermediate support on a continuous beam?

It decreases the negative moment at the support and lowers the positive moment at the mid-span.It decreases the negative moment at the support and raises the positive moment at the mid-span.It increases the negative moment at the support and lowers the positive moment at the mid-span.It increases the negative moment at the support and raises the positive moment at the mid-span.

5.Which factors influence the shrinkage of concrete?

Both (1) and (2)Both (2) and (3)Only (3)All of (1), (2), and (3)None of the above

6.What primarily determines the depth of the footing for an isolated column?

Only the maximum bending momentBoth the maximum bending moment and shear forceThe maximum bending moment and punching shearMaximum bending moment, shear force, and punching shear

7.When designing the front counterfort in a counterfort retaining wall, where is the primary reinforcement placed?

exclusively at the bottom surface adjacent to the counterfortexclusively at the top surface adjacent to the counterfortat both the bottom near the counterfort and the top near the center of the spanat both the top near the counterfort and the bottom near the center of the span

8.In a counterfort retaining wall, where is the primary reinforcement typically placed?

On the bottom and inclined surfaces of the front counterfortOn the inclined surface of the front counterfort and the bottom surface of the back counterfortOn the bottom surface of the front counterfort and the inclined surface of the back counterfortOn the bottom and inclined surfaces of the back counterfortNone of the above

9.In a T-shaped reinforced concrete retaining wall, where is the primary reinforcement placed in the toe section?

Only on the top surface perpendicular to the wallOn both the top surfaces parallel and perpendicular to the wallOn both bottom surfaces parallel and perpendicular to the wallOnly on the bottom surface perpendicular to the wall

10.In a counterfort retaining wall, which of the following statements are true?

The vertical slab acts as a continuous slab and the heel slab is also continuous.The vertical slab functions as a continuous slab while the heel slab behaves as a cantilever.The heel slab is designed as a continuous slab and the vertical slab works as a cantilever.Both the vertical slab and the heel slab are designed as cantilevers.None of the above.

11.Identify which of the following pairs of statements are accurate regarding the factor of safety for steel and concrete.

Statements (1) and (3)Statements (1) and (4)Statements (2) and (3)Statements (2) and (4)None of the above

12.What are the effects of adding calcium chloride to concrete?

Increase in shrinkage and increase in setting timeIncrease in shrinkage and decrease in setting timeDecrease in shrinkage and increase in setting timeDecrease in shrinkage and decrease in setting time

13.Which of the following statements is incorrect?

Lean concrete mixtures exhibit more bleeding than richer mixes.Incorporating finer pozzolanic aggregates helps reduce bleeding.Adding calcium chloride tends to increase bleeding in concrete.None of the above statements are incorrect.

14.Which of the following statements is accurate?

The elastic modulus of high tensile steel is almost identical to that of mild steel.High tensile steel has a higher elastic modulus compared to mild steel.The carbon content in high carbon steel is lower than in mild steel.High tensile steel is less expensive than mild steel.

18.In a symmetrically reinforced concrete section, what are the typical types of shrinkage stresses experienced by the concrete and the steel reinforcement, respectively?

compressive in concrete and tensile in steeltensile in concrete and compressive in steelcompressive in both concrete and steeltensile in both concrete and steelnone of the above

19.For a spherical dome under a concentrated load at the crown or a uniformly distributed load, what is the nature of the meridional force?

NilTensionCompressionEither tension or compressionNone of the above

20.What is the formula for the maximum hoop compression in a dome?

wR divided by 4dwR divided by 2dwR divided by d2 times wR divided by d

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