Concrete Technology And Design Of Concrete Structures MCQ Questions & Answers

Concrete Technology And Design Of Concrete Structures MCQ Questions & Answers | Civil Engineering

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According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

A) 0.43 d B) 0.55 d C) 0.68 d D) 0.85 d

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Answer & Solution

Answer: Option A

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Which of the following R.C. retaining walls is suitable for heights beyond 6 m?

A) L-shaped wall B) T-shaped wall C) Counterfort type D) All of the above

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Answer & Solution

Answer: Option C

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In T-shaped R.C. retaining walls, the main reinforcement in the stem is provided on

A) The front face in one direction B) The front face in both directions C) The inner face in one direction D) The inner face in both directions

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Answer & Solution

Answer: Option C

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Which of the following has high tensile strength?

A) Plain hot rolled wires B) Cold drawn wires C) Heat treated rolled wires D) All have same tensile strength

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Answer & Solution

Answer: Option B

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Minimum grade of concrete to be used in reinforced concrete as per IS: 456-1978 is

A) M15 B) M20 C) M10 D) M25

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Answer & Solution

Answer: Option B

Solution:

As per IS: 456-1978, the minimum grade of concrete required for reinforced concrete (RC) structures is M20.

The M20 grade concrete has a characteristic compressive strength of 20 MPa after 28 days of curing.

Lower grades like M15 and M10 are generally used for plain cement concrete (PCC) and are not suitable for reinforced structures.

Higher grades such as M25 and above are used for structural members requiring higher strength.

Hence, the correct answer is M20 (Option B).

The purpose of reinforcement in pre-stressed concrete is

A) To provide adequate bond stress B) To resist tensile stresses C) To impart initial compressive stress in concrete D) All of the above

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Answer & Solution

Answer: Option C

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For a cantilever of effective depth of 0.5 m, the maximum span to satisfy vertical deflection limit is

A) 3.5 m B) 4 m C) 4.5 m D) 5 m

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Answer & Solution

Answer: Option A

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The relation between modulus of rupture f_cr, splitting strength f_cs and direct tensile strength f_cl is given by

A) f_cr - f_cs = f_cl B) f_cr > f_cs > f_cl C) f_cr < f_cs < f_cl D) f_cs > f_cr > f_cl

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Answer & Solution

Answer: Option B

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According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

A) The least lateral dimension B) 2 times the least lateral dimension C) 3 times the least lateral dimension D) 4 times the least lateral dimension

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Answer & Solution

Answer: Option C

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If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

A) Balanced beam B) Under reinforced beam C) Over reinforced beam D) None of the above

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Answer & Solution

Answer: Option C

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