PlacementPrepThe characteristic strength of M25 concrete is:
Solution
M25 means a 28-day characteristic cube strength of 25 N/mm².
Answer: (C) 25 N/mm²
Technical · Civil Engineering
RCC and Concrete MCQs for placement tests
20 technical questions of moderate difficulty, as asked in campus placement and company tests. Each has a short explanation.
In limit state design (IS 456), the partial safety factor for concrete is:
Solution
γm = 1.5 for concrete and 1.15 for steel.
Answer: (D) 1.5
In limit state design, the partial safety factor for steel is:
Solution
Steel properties are more reliable than concrete.
Answer: (A) 1.15
The design compressive strength used for concrete in flexure (IS 456) is:
Solution
0.67 fck / 1.5 = 0.446 fck.
Answer: (C) 0.446 fck
The design strength of steel in limit state design is:
Solution
fy / 1.15 ≈ 0.87 fy.
Answer: (D) 0.87 fy
Minimum nominal cover for a footing as per IS 456 is generally:
Solution
Footings in contact with soil need more cover.
Answer: (C) 50 mm
Concrete is strong in:
Solution
Its tensile strength is only about 10–15% of its compressive strength.
Answer: (C) Compression
Reinforcement in a simply supported RCC beam is mainly placed:
Solution
The bottom is in tension under sagging moments.
Answer: (B) Near the bottom face
Stirrups in a beam mainly resist:
Solution
They also hold the main bars in place.
Answer: (A) Shear
A one-way slab is one where the ratio of longer span to shorter span is:
Solution
Load is carried mainly in the shorter direction.
Answer: (D) Greater than 2
The water-cement ratio mainly affects concrete's:
Solution
A lower w/c ratio gives stronger concrete (Abrams' law).
Answer: (B) Strength and durability
Prestressed concrete uses:
Solution
Pre-compression offsets tensile stresses from loads.
Answer: (D) High-tensile steel tensioned to induce compression in concrete
The modulus of elasticity of concrete as per IS 456 is:
Solution
Ec = 5000√fck.
Answer: (B) 5000√fck N/mm²
A column is termed 'short' when its effective length to least lateral dimension ratio is less than:
Solution
IS 456 treats le/D < 12 as a short column.
Answer: (D) 12
Minimum longitudinal reinforcement in an RCC column as per IS 456 is:
Solution
It is between 0.8% and 6% (4% preferred maximum).
Answer: (C) 0.8% of gross area
The minimum number of longitudinal bars in a rectangular column is:
Solution
At least four bars, one in each corner; six in a circular column.
Answer: (D) 4
Honeycombing in concrete is caused by:
Solution
Voids remain where concrete did not flow around the aggregate.
Answer: (D) Poor compaction
Development length is provided to:
Solution
Bars must extend far enough to transfer their force.
Answer: (C) Ensure adequate bond between steel and concrete
Which part of a T-beam acts as the flange?
Solution
The slab cast with the beam resists compression.
Answer: (C) The slab
The 28-day compressive strength of concrete is tested using cubes of size:
Solution
Standard cubes are 150 mm on each side.
Answer: (C) 150 mm
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