30 real RCC Fundamentals questions from the Civil Core bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Steel–concrete compatibility?
Junior
A.the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
B.strength below which not more than 5 percent of test results are expected to fall, so M25 means a 28-day cube strength of 25 N/mm²
C.steel yields before concrete crushes, giving large deflection and visible cracking as warning, which is why codes require this failure mode
D.concrete crushes before steel yields, producing a sudden brittle failure without warning, so limit state design prohibits it
2. Which term means: "the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire"?
A.Steel–concrete compatibility — Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
B.Steel–concrete compatibility — concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face
C.Steel–concrete compatibility — the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
D.Steel–concrete compatibility — a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way
5. Which term means: "strength below which not more than 5 percent of test results are expected to fall, so M25 means a 28-day cube strength of 25 N/mm²"?
A.Characteristic strength — compression steel is added when the factored moment exceeds the limiting moment and the section depth is restricted by headroom or architecture
B.Characteristic strength — strength below which not more than 5 percent of test results are expected to fall, so M25 means a 28-day cube strength of 25 N/mm²
C.Characteristic strength — Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
D.Characteristic strength — a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way
8. Which term means: "section in which concrete reaches its limiting strain of 0.0035 at the same instant that tension steel reaches its yield strain"?
A.Balanced section — Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
B.Balanced section — strength below which not more than 5 percent of test results are expected to fall, so M25 means a 28-day cube strength of 25 N/mm²
C.Balanced section — section in which concrete reaches its limiting strain of 0.0035 at the same instant that tension steel reaches its yield strain
D.Balanced section — concrete crushes before steel yields, producing a sudden brittle failure without warning, so limit state design prohibits it
11. Which term means: "a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way"?
A.One-way vs two-way slab — concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face
B.One-way vs two-way slab — strength below which not more than 5 percent of test results are expected to fall, so M25 means a 28-day cube strength of 25 N/mm²
C.One-way vs two-way slab — xu,max/d is 0.53 for Fe250, 0.48 for Fe415 and 0.46 for Fe500, the cap that keeps a section from becoming over-reinforced
D.One-way vs two-way slab — a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way
A.Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
B.steel yields before concrete crushes, giving large deflection and visible cracking as warning, which is why codes require this failure mode
C.concrete crushes before steel yields, producing a sudden brittle failure without warning, so limit state design prohibits it
D.the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
14. Which term means: "steel yields before concrete crushes, giving large deflection and visible cracking as warning, which is why codes require this failure mode"?
A.Under-reinforced section — steel yields before concrete crushes, giving large deflection and visible cracking as warning, which is why codes require this failure mode
B.Under-reinforced section — Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
C.Under-reinforced section — the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
D.Under-reinforced section — a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way
A.Over-reinforced section — xu,max/d is 0.53 for Fe250, 0.48 for Fe415 and 0.46 for Fe500, the cap that keeps a section from becoming over-reinforced
B.Over-reinforced section — concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face
C.Over-reinforced section — concrete crushes before steel yields, producing a sudden brittle failure without warning, so limit state design prohibits it
D.Over-reinforced section — the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
A.Limiting neutral axis depth — steel yields before concrete crushes, giving large deflection and visible cracking as warning, which is why codes require this failure mode
B.Limiting neutral axis depth — xu,max/d is 0.53 for Fe250, 0.48 for Fe415 and 0.46 for Fe500, the cap that keeps a section from becoming over-reinforced
C.Limiting neutral axis depth — a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way
D.Limiting neutral axis depth — the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
A.Limiting moment of resistance — a slab spans one way when the longer-to-shorter span ratio exceeds 2; below 2 it bends in both directions and is designed as two-way
B.Limiting moment of resistance — Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
C.Limiting moment of resistance — concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face
D.Limiting moment of resistance — the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
A.compression steel is added when the factored moment exceeds the limiting moment and the section depth is restricted by headroom or architecture
B.strength below which not more than 5 percent of test results are expected to fall, so M25 means a 28-day cube strength of 25 N/mm²
C.the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
D.section in which concrete reaches its limiting strain of 0.0035 at the same instant that tension steel reaches its yield strain
26. Which term means: "compression steel is added when the factored moment exceeds the limiting moment and the section depth is restricted by headroom or architecture"?
A.Doubly reinforced beam — concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face
B.Doubly reinforced beam — section in which concrete reaches its limiting strain of 0.0035 at the same instant that tension steel reaches its yield strain
C.Doubly reinforced beam — Mu,lim = 0.36 fck b xu,max (d − 0.42 xu,max), the largest moment a singly reinforced section can carry under limit state
D.Doubly reinforced beam — compression steel is added when the factored moment exceeds the limiting moment and the section depth is restricted by headroom or architecture
29. Which term means: "concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face"?
A.Limit state stress block — concrete compression is parabolic-rectangular with peak stress 0.446 fck, total force 0.36 fck b xu acting 0.42 xu below the compression face
B.Limit state stress block — the two materials act together because their thermal coefficients are nearly equal (about 12×10⁻⁶ per °C), bond is good and concrete protects steel from corrosion and fire
C.Limit state stress block — section in which concrete reaches its limiting strain of 0.0035 at the same instant that tension steel reaches its yield strain
D.Limit state stress block — xu,max/d is 0.53 for Fe250, 0.48 for Fe415 and 0.46 for Fe500, the cap that keeps a section from becoming over-reinforced
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