Enlarge the beam's depthUtilize a greater quantity of thinner reinforcement barsApply fewer but thicker reinforcement barsInstall vertical stirrups within the beamIncrease the concrete cover thickness

10.How does the compressive strength of a 100 mm cube compare to that of a 150 mm cube?

LowerHigherThe sameNot applicableCannot be determined

11.What is the typical range for the fineness modulus of fine aggregate?

Between 2.0 and 3.5From 3.5 up to 5.0Within 5.0 to 7.0Ranging from 6.0 to 8.5

12.Which statement correctly describes the factor of safety when comparing steel and concrete?

The safety factor for steel and concrete is identical.Steel has a smaller factor of safety compared to concrete.Steel possesses a greater factor of safety than concrete.None of the listed statements are accurate.

13.How does Poisson’s ratio of concrete change with the mix quality?

Stays the same regardless of mix compositionRises as the mix becomes richerLowers when the mix is richerNo change related to mix qualityCannot be determined

14.How does finer grinding of cement influence its strength development?

It impacts only the initial strength gainIt influences solely the final strengthIt affects both the initial and final strengthIt has no effect on the strength

15.By approximately how much does a 1% increase in voids decrease the strength of a concrete mix?

5%10%15%20%25%

16.At approximately what moisture content does sand experience its greatest increase in volume due to bulking?

2 percent4 percent6 percent10 percentNot applicable

17.How does the setting time of high alumina cement compare to that of ordinary Portland cement?

It has a longer initial setting time but a shorter final setting timeIt exhibits a shorter initial setting time and a longer final setting timeBoth initial and final setting times are longerBoth initial and final setting times are shorter

18.Which aggregate shape is most suitable for achieving optimal concrete workability?

smooth and roundedlong and thinsharp and angularany of the above

19.What does the modulus of rupture in concrete indicate?

Flexural tensile strengthDirect tensile strengthCompressive strengthSplit tensile strength

20.What is the approximate percentage of voids present in cement?

25 percent40 percent60 percent80 percentNone of the above

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How to prepare with Design of Concrete Structures MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
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Design of Concrete Structures

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Practice questions

1.When is formwork typically taken off from walls, columns, and vertical surfaces of structural elements?

2.What is the maximum allowable variation in test strength among individual samples?

3.When concrete is mixed manually by hand, what additional percentage of cement should be included?

4.What should be the compacting factor of concrete to ensure good workability when placing concrete in heavily reinforced sections without using vibration?

5.What is the highest amount of water required for 50 kg of cement in M 15 grade concrete?

6.According to IS:456-1978, what is the minimum grade of concrete required for reinforced concrete structures?

7.Given that the allowable tensile stress in steel is 140 N/mm², what is the depth of the neutral axis for a singly reinforced rectangular balanced section expressed as a fraction of the effective depth (d)?

8.What do we call a beam when its actual neutral axis depth exceeds the depth of the critical neutral axis?

9.If a beam experiences bond failure, what is the most cost-effective way to enhance its bond strength?