This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “T-Beams”.

1. The flexural tensile strength of M25 grade of concrete is N/mm2 as per IS: 456- 2000 is _______

a) 1.5

b) 2.5

c) 3.5

d) 4.5

View Answer

Explanation: Flexural tensile strength = 0.7f

_{ck}

^{1/2}N/mm

^{2}

= 2.5 N/mm

^{2}

2. The permissible bending tensile stress in concrete for the vertical wall of an RC water tank made of M25 concrete is ____

a) 8.5

b) 6

c) 2.5

d) 1.8

View Answer

Explanation: As per IS: 3370, the permissible bending tensile stress in concrete for the vertical wall of an RC water tank made of M25 concrete is 1.8.

3. The modulus of elasticity of concrete mix M25 is _______

a) 25000 N/mm^{2}

b) 28500 N/mm^{2}

c) 15000 N/mm^{2}

d) 5700 N/mm^{2}

View Answer

Explanation: E = 5000f

_{ck}

^{1/2}

4. What will be the air content of the soil if the degree of saturation is 60%?

a) 60%

b) 50%

c) 40%

d) 30%

View Answer

Explanation: Air content = Full volume – degree of saturation

= 100-60 = 40%

5. At which point does shear stress is zero in a beam?

a) Centroid

b) Extreme Fibres

c) End Points

d) Centre of the beam

View Answer

Explanation: Shear stress is zero at extreme fibres because of zero shear at that point.

6. While designing a beam, what points are considered from the following?

a) Shear force

b) Bending moment

c) Both A and B

d) Neither A nor B

View Answer

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

7. Why is slump cone test performed in the concrete?

a) To determine strength

b) To determine workability

c) To determine toughness

d) To find permeability

View Answer

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.

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