# Design of RC Structures MCQ (Multiple Choice Questions)

1. What does RC stand for in “RC Structures”?
a) Resilient Columns
b) Real Construction
c) Reinforced Concrete

Explanation: RC stands for Reinforced Concrete. It’s a mix of concrete and steel that makes structures stronger. Concrete handles compression well, while steel adds strength for tension. This mix makes buildings tough and able to handle different kinds of weight.

2. Why is Steel used as reinforced material in RCC?
a) Steel is not reactive to water
b) Thermal coefficient of steel is less than that of concrete
c) Steel provides compressive strength to the structure
d) Steel provides tensile strength to the structure

Explanation: As per the nature of steel and concrete, steel has tensile strength and concrete has compressive strength so they are joined together to form a perfect bond.

3. What is the primary function of shear reinforcement in RC beams?
a) Improving durability
b) Preventing shear failure
c) Reducing deflection
d) Enhancing flexural strength

Explanation: Shear reinforcement, usually in the form of stirrups, is in RC beams to stop shear failure. It works against the diagonal tension forces that might cause the structure to fail under shear stress.

4. Where are the doubly reinforced beams required?
a) Where high strength is required
b) Where concrete amount is restricted
c) Where depth of the beam is restricted
d) Where width of the beam is restricted

Explanation: Beams reinforced with steel in both compression and tensions are called doubly reinforced beams. They are used where architectural consideration of depth is restricted.

5. What is the modular ratio for M50 grade concrete?
a) 5.83
b) 18.67
c) 6.44
d) 7.18

Explanation: m = 280/3σcbc
σcbc for M50 = 16
So, m = 5.83

6. What is the basic material used for manufacturing of cement?
a) Sand
b) Stone
c) Granite
d) Gypsum

Explanation: The basic materials for the manufacturing of the cement are Lime and Gypsum.

7. What is the thickness of flange of a T beam?
a) Thickness of concrete topping
b) Twice of web
c) Thickness of the web
d) Width of the web

Explanation: Thickness of the T beam is equal to the concrete topping as the flange is just made of concrete in a T beam.

8. When the shear reinforcement is provided vertically, they are called?
a) Spacing
b) Stirrups
c) Shear spacing
d) Shear stirrups

Explanation: These consist of 6mm to 10mm diameter bars bent round the tensile reinforcement.

9. What is the maximum slenderness ratio of lasing bars?
a) 145
b) 150
c) 120
d) 100

Explanation: According to IS 800, the slenderness ratio of lasing bars should not exceed 145.

10. Which of the following property is true for brittle material?
a) Elastic Nature
b) Plastic Nature
c) Conductors
d) Homogenous

Explanation: Brittle material is the material which has the tendency to break and has the ability to fracture.

11. Which of the following is directly proportional to workability of concrete?
a) Aggregate cement ratio
b) Cement
c) Water cement ratio
d) Transit Time

Explanation: As the water cement ratio increases, the workability of concrete increases.

12. What is the minimum thickness of separating walls?
a) 200mm
b) 150mm
c) 100mm
d) 190mm

Explanation: According to Building Regulations, the minimum thickness of separating walls is 190mm.

13. What is the maximum area for tension reinforcement in a beam?
a) 4%
b) 8%
c) 6%
d) 2%

Explanation: According to IS:456-2000, the maximum area for tension reinforcement in a beam is 4%.

14. Why is slump cone test performed in the concrete?
a) To find permeability
b) To determine toughness
c) To determine workability
d) To determine strength

Explanation: Slump cone test is used to determine the workability of concrete. It helps to find the magnitude and nature of slump that whether it is true, shear or collapse.

15. While designing a beam, what points are considered from the following?
a) Bending moment
b) Shear force
c) Neither Shear force nor Bending moment
d) Both Shear force and Bending moment

Explanation: Both shear force and bending moment is considered while designing a beam because both acts as a loading and variable in it.

16. What types of beams are failed by flexural yielding?
a) Which are not laterally supported
b) Which are laterally shift
c) Non-compact sections
d) Beams have much greater strength and stiffness

Explanation: The beams which are laterally shift are failed by flexural yielding because they don’t have capacity to withstand the load of the structure. The yielding occurs and they don’t have any support on the lateral.

17. Which of the following is the function of the transverse reinforcement in a column?
a) To reduce effect of creep
b) To impart certain ductility to the column
c) To prevent certain brittle failure
d) To prevent longitudinal buckling of longitudinal reinforcement

Explanation: The function of the transverse reinforcement is to prevent buckling of the longitudinal reinforcement. The function of the longitudinal reinforcement are:
i) To prevent certain brittle failure
ii) To impart certain ductility to the column
iii) To reduce effect of creep.

18. What is the horizontal distance or spacing between the reinforcement bars of an 80mm thick slab?
a) 340mm
b) 240mm
c) 440mm
d) 540mm

Explanation: According to the codal provision, the spacing = 3*thickness of the slab or 300mm whichever is less.
Hence the spacing s = 3*80mm=240mm.

19. What is the minimum thickness of the flat slab?
a) 750 mm
b) 125 mm
c) 150 mm
d) 250mm

Explanation: The thickness of the slab usually depends upon the effective span by overall depth ratio. The minimum thickness of the flat slab is 125mm by codal guidelines.

20. What is the objective of providing foundation to a structure?
a) To distribute the load to the soil
b) For the compaction of the soil below the structure
c) To provide a base to the structure
d) To stabilize the soil below the structure

Explanation: The objective of providing foundation to a structure is to distribute the load to the soil. It should be such that the maximum pressure on the soil is in its permissible bearing value. At the same time the settlement is within the permissible limits.

21. Which of the following cannot be used to determine the load carrying capacity of a pile?
a) Penetration tests
b) Dynamic formulae
d) Double acting hammer

Explanation: The load carrying capacity of a pile can be determined by using the methods: Dynamic formulae, static formulae, pile load tests and penetration tests. This depends on the permissible settlement and overall stability of the pile foundation.

22. Which of the following is the weight added above retaining walls?
a) Surcharge
b) Backfill
c) Earth pressure

Explanation: The material that retaining wall support is backfill. The top surface of backfill can be horizontal or inclined. Position of backfill lying above the horizontal plane at the elevation of the top of a wall is surcharge. Angle of inclination of surcharge with horizontal is the surcharge angle.

23. A beam is prestressed by a cable carrying initial prestress of 500 N/mm2. Which of the following is the percentage of loss of prestress due to shrinkage of concrete if the beam is pre – tensioned? (age of concrete at transfer is 7 days).
a) 8.40%
b) 8.38%
c) 12.5%
d) 12%

Explanation: For pre – tensioned beams:
Δσ = (εshEs),
εsh = 3 × 10-4, (Es) = 200 kN/mm2
Loss of prestress Δσ = 3 × 10-4 × 200 × 1000 = 60 N/mm2
Percentage loss of prestress = (60 / 500) × 100 = 12%

24. Which of the following equation expresses the working stress method for reinforced concrete?
a) μR > L
b) μR > 2L
c) μR > (L / 2)
d) μR > 4L

Explanation: The working stress method can be expressed by the equation as:
μR > L
Here,
μ = inverse of factor of safety which is less than unity,
R = resistance of the structural elements and
L = working loads on the structural elements.

25. Which of the following is not an assumption for working stress design method?
a) Concrete is elastic
b) A section which is plane before bending remains plane after bending
c) Tensile strength of concrete is considered
d) Bond between steel and concrete is perfect within the elastic limit of steel

Explanation: The working stress method is based on the following assumptions:
i. A section which is plane before bending remains plane after bending,
ii. Bond between steel and concrete is perfect within the elastic limit of steel,
iii. Tensile strength of concrete is ignored,
iv. Concrete is elastic,
v. The modular ratio has value of (280 / 3 σcb).

26. Which of the following is not a disadvantage of Working stress method?
a) This method is uneconomical
b) This method considers the modes of failure
c) In this method concrete does not have a definite modulus of elasticity
d) This method assumes that stress- strain relationship is constant

Explanation: The WSM gives larger section of structural members, thus it is uneconomical. It assumes that stress-strain relationship is constant for concrete, which is not true. It does not consider the modes of failure of the structure (brittle or ductile). Concrete does not have a definite modulus of elasticity because of creep and non-linear stress-strain relationship.

## Chapterwise Multiple Choice Questions on Design of RC Structures

Our 1000+ MCQs focus on all topics of the Design of RC Structures subject, covering 100+ topics. This will help you to prepare for exams, contests, online tests, quizzes, viva-voce, interviews, and certifications. You can practice these MCQs chapter by chapter starting from the 1st chapter or you can jump to any chapter of your choice.

## 1. MCQ on Composite Sections Analysis by Elastic Theory

The section contains multiple choice questions and answers on composite sections analysis by elastic theory, composite members subjected to bending, neutral axis of beam section, and aggregates.

## 2. Singly Reinforced Beams

The section contains Design of RC Structures questions and answers on singly reinforced beams, neutral axis, lever arm, moment of resistance, and types of bars used in RCC.

## 3. Doubly Reinforced Beams

The section contains MCQs on doubly reinforced beams, analysis of concrete sections, and steel beam theory.

## 4. Design of RC Structures MCQ on Shear in Beams

The section contains multiple choice questions and answers on shear stress, diagonal tension, shear reinforcement, inclined reinforcement, lattice-girder effect, and limiting shear stress.

## 5. Design of RC Structures Multiple Choice Questions on Bonds

The section contains questions and answers on property of bonds, anchoring bars, and curtailment of reinforcement.

## 6. Reinforcement

The section contains Design of RC Structures MCQs on reinforcement, bending bars, joining overlapping, and minimum spacing.

## 7. T-Beams

The section contains multiple choice questions and answers on T-beams, neutral axis of T-beam, lever arm and moment of resistance, and nominal shear stress.

The section contains questions and answers on axially loaded columns, cover to reinforcement, elastic theory, limit state method, and spirally reinforced columns.

## 9. MCQ on Slabs

The section contains Design of RC Structures MCQs on slabs, thickness of slab, reinforcement in slabs, Rankine Grashoff theory, two-way slabs, Marcus correction, flat slabs, and circular slabs.

## 10. Design of RC Structures Questions on Beams

The section contains multiple choice questions and answers on beams and rectangular beams.

## 11. Foundations

The section contains questions and answers on foundations, safe bearing capacity of soil, general rules of design, and pile foundation.

## 12. Retaining Walls

The section contains Design of RC Structures MCQs on retaining walls and stress analysis of soils.

## 13. Design of RC Structures MCQ on Water Tanks

The section contains multiple choice questions and answers on water tanks classifications.

## 14. Prestressed Concretes

The section contains questions and answers on prestressed concretes basics.

## 15. Design of RC Structures Questions on Limit State Method

The section contains MCQs on limit state method, singly reinforced and doubly reinforced sections.

## 16. Working Stress Method

The section contains Design of RC Structures multiple choice questions and answers on working stress method, modular ratio, and its limitations.

## 17. Limit State of Serviceability

The section contains questions and answers on limit state of serviceability.

If you would like to learn "Design of RC Structures" thoroughly, you should attempt to work on the complete set of 1000+ MCQs - multiple choice questions and answers mentioned above. It will immensely help anyone trying to crack an exam or an interview.

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