MCQ Reinforced Cement Concrete

MCQ Reinforced Cement Concrete

Q1. The minimum clear cover to main reinforcement in an RCC footing as per IS 456:2000 is:

20 mm 25 mm 50 mm 75 mm

Q2. In a doubly reinforced rectangular beam, compression steel is provided to:

Reduce deflection Increase moment of resistance beyond singly reinforced limit Increase ductility only Counter thermal effects

Q3. In RCC construction, which material primarily resists tensile forces?

Cement paste Coarse aggregates Reinforcement steel Water

Q4. The minimum grade of concrete for RCC as per IS 456:2000 for structural members is:

M10 M15 M20 M25

Q5. The purpose of cover blocks in RCC construction is to:

Increase concrete strength Maintain proper spacing between reinforcement bars Ensure correct cover thickness to reinforcement Improve curing efficiency

Q6. In RCC construction, which material primarily resists tensile forces?

Cement paste Coarse aggregates Reinforcement steel Water

Q7. The minimum grade of concrete for RCC as per IS 456:2000 for structural members is:

M10 M15 M20 M25

Q8. The purpose of cover blocks in RCC construction is to:

Increase concrete strength Maintain proper spacing between reinforcement bars Ensure correct cover thickness to reinforcement Improve curing efficiency

Q9. What is the usual diameter range for main reinforcement bars in RCC slabs?

4 mm – 6 mm 8 mm – 12 mm 16 mm – 20 mm 25 mm – 32 mm

Q10. Which of the following is NOT a type of RCC beam?

Simply supported beam Cantilever beam Steel truss beam Continuous beam

Q11. What is the typical minimum cover required for RCC footings as per IS 456:2000?

15 mm 25 mm 50 mm 75 mm

Q12. In RCC, which factor primarily controls shrinkage cracking?

Water-cement ratio Aggregate size Type of steel Formwork type

Q13. What is the main purpose of stirrups in RCC beams?

To resist bending moment To resist axial load To resist shear forces To reduce deflection

Q14. Which IS code covers general guidelines for plain and reinforced concrete?

IS 875 IS 456 IS 800 IS 1786

Q15. What is the minimum lap length for tension reinforcement in RCC as per IS 456:2000?

24 times the bar diameter 30 times the bar diameter 40 times the bar diameter 50 times the bar diameter

Q16. In RCC, the main reinforcement is placed in which zone of a simply supported beam?

Top zone Bottom zone Middle zone Neutral axis

Q17. What is the purpose of lateral ties in RCC columns?

Prevent buckling of longitudinal bars Increase compressive strength Reduce shrinkage Improve workability

Q18. Which of the following is an assumption in the limit state method for RCC design?

Concrete is elastic Plane sections remain plane after bending Stress-strain curve of steel is parabolic Concrete resists tension

Q19. The modular ratio (m) is the ratio of:

Stress in steel to stress in concrete Elastic modulus of steel to that of concrete Load on steel to load on concrete None of these

Q20. The limit state of serviceability deals with:

Strength failure Excessive deflection and cracking Ultimate collapse Bearing capacity failure

Q21. The factor of safety for concrete in limit state of collapse as per IS 456:2000 is:

1.15 1.5 1.25 1.0

Q22. For reinforced concrete, the permissible tensile stress in mild steel (Fe 250) is:

140 N/mm² 190 N/mm² 215 N/mm² 250 N/mm²

Q23. Which type of bar is generally used as stirrups in RCC beams?

Plain bars HYSD bars TMT bars Pre-stressing strands

Q24. A singly reinforced beam is:

Reinforced in tension and compression both Reinforced only in compression Reinforced only in tension Reinforced only for shear

Q25. In RCC, the maximum permissible deflection for simply supported beams under live load is:

Span/180 Span/250 Span/360 Span/500

Q26. In RCC, the cover for main reinforcement in beams as per IS 456:2000 should not be less than:

15 mm 20 mm 25 mm 30 mm

Q27. In a cantilever RCC beam, the main tension reinforcement is provided at:

Top Bottom Neutral Axis Center

Q28. In RCC, the minimum percentage of longitudinal reinforcement in columns is:

0.8% 0.6% 1.0% 1.5%

Q29. Creep in concrete is:

Increase in strain under sustained load Increase in strength over time Decrease in strength over time Rapid setting

Q30. The minimum grade of concrete for RCC as per IS 456:2000 is:

M10 M15 M20 M25

Q31. The diameter of bars used as lateral ties in RCC columns is usually not less than:

6 mm 8 mm 10 mm 12 mm

Q32. Maximum spacing of stirrups in RCC beams should not exceed:

200 mm 300 mm 250 mm 350 mm

Q33. Which test determines the workability of fresh concrete?

Compressive strength test Slump test Tensile strength test Water absorption test

Q34. The tensile strength of concrete is generally taken as:

1/2 to 1/3 of compressive strength Equal to compressive strength 2 times compressive strength 5 times compressive strength

Q35. The minimum diameter for main reinforcement bars in RCC slabs should be:

6 mm 8 mm 10 mm 12 mm

Q36. The water-cement ratio is critical in concrete because it affects:

Only strength Only durability Both strength and durability Only workability

Q37. The development length of bars in RCC is calculated to:

Avoid buckling Prevent bond failure Control shrinkage Control cracking

Q38. Shear reinforcement is provided in RCC beams to:

Resist tensile stresses Prevent bond failure Carry shear force Carry axial load

Q39. Which of the following improves the workability of concrete?

Reducing water-cement ratio Adding admixtures Increasing aggregate size Increasing cement content

Q40. Which of these bars has higher ductility?

Fe250 Fe415 Fe500 Fe550

Q41. The function of cover blocks in RCC is to:

Increase reinforcement Maintain cover distance Reduce deflection Increase concrete strength

Q42. The modulus of elasticity for concrete is primarily influenced by:

Aggregate type Water-cement ratio Cement content Curing method

Q43. Concrete strength gain continues up to:

7 days 14 days 28 days Many years

Q44. The minimum clear spacing between two parallel reinforcement bars should not be less than:

Bar diameter 1.5 times bar diameter 2 times bar diameter 3 times bar diameter

Q45. Which test is commonly used to determine the compressive strength of concrete?

Slump test Compression test on cube Flexural strength test Water absorption test

Q46. What is the minimum number of longitudinal bars in a rectangular RCC column as per IS 456:2000?

2 4 6 8

Q47. What is the characteristic compressive strength of M25 concrete?

15 MPa 20 MPa 25 MPa 30 MPa

Q48. Which IS code governs the general guidelines for RCC structures?

IS 383 IS 516 IS 456 IS 10262

Q49. Which factor improves the tensile strength of concrete?

Admixtures Steel reinforcement Fine aggregates Water reducer

Q50. The minimum clear cover for footing reinforcement is:

25 mm 50 mm 75 mm 100 mm

Q51. In RCC columns, the lapping of bars should preferably be done at:

Near mid-height At bottom Near supports Top of the column

Q52. Which property of concrete is assessed by the compaction factor test?

Durability Strength Workability Permeability

Q53. In RCC structures, which part is primarily subjected to tensile stresses?

Concrete Steel reinforcement Formwork None

Q54. What is the effect of excess water in concrete?

Increases strength Increases permeability Reduces durability Both B and C

Q55. The maximum size of aggregate for RCC work, as per IS 456:2000, should generally be:

10 mm 20 mm 25 mm 40 mm

Q56. The main reinforcement in a one-way slab runs:

Along shorter span Along longer span Both equally Diagonally

Q57. Which admixture is used to delay the setting time of concrete?

Retarder Accelerator Plasticizer Air-entraining agent

Q58. The ratio of span to depth for cantilever RCC slabs should not exceed:

7 10 12 20

Q59. The moment of resistance of an RCC section depends upon:

Area of steel only Grade of concrete only Both steel area and concrete grade Cover alone

Q60. Which type of RCC beam carries axial load as well as bending moment?

Simple beam Cantilever beam Lintel Column beam

Q61. The ideal shape for RCC columns is:

Rectangular Circular Square L-shaped

Q62. The commonly used method for curing concrete slabs is:

Sprinkling water Hot air Steam Covering with polyethylene sheets

Q63. The slump value for concrete used in beams and slabs should ideally be:

25–50 mm 75–125 mm 150–200 mm Zero

Q64. Tensile cracks in RCC beams first appear at:

Neutral axis Top fibre Bottom fibre Center

Q65. Maximum number of bars in a layer for a slab should be:

2 3 4 Unlimited

Q66. What is the primary reason for providing stirrups in RCC beams?

Resist bending moment Resist shear force Improve workability Reduce deflection

Q67. What is the minimum grade of concrete recommended for RCC structures exposed to severe environmental conditions?

M15 M20 M30 M40

Q68. Which IS code specifies the mix design procedure for concrete?

IS 383 IS 10262 IS 2386 IS 9103

Q69. What is the effective cover in RCC?

Distance from bottom to center of bar Distance from concrete surface to outer edge of bar Distance from concrete surface to center of bar None

Q70. In RCC columns, which reinforcement is provided to prevent buckling?

Longitudinal bars Lateral ties Cover blocks Anchorage bars

Q71. What is the usual minimum diameter for main bars in RCC beams?

8 mm 10 mm 12 mm 16 mm

Q72. A beam is considered over-reinforced if:

Steel fails before concrete Concrete fails before steel Both fail together It has no stirrups

Q73. Which aggregate property affects concrete workability the most?

Shape Color Size Porosity

Q74. Which test assesses the flexural strength of concrete?

Cube test Slump test Beam test Water absorption test

Q75. To improve durability, the water-cement ratio for RCC should generally be:

Less than 0.45 0.5 0.6 Greater than 0.65

Q76. Which test determines the soundness of cement?

Vicat apparatus test Le-Chatelier test Slump test Compaction factor test

Q77. Which property of concrete is measured using a slump test?

Strength Workability Durability Permeability

Q78. In RCC, the cover to reinforcement is provided primarily to:

Increase strength Prevent corrosion Reduce cost Improve workability

Q79. Which cement is preferred for marine structures?

Rapid hardening cement Sulphate resisting cement Low heat cement Ordinary Portland cement

Q80. The function of lateral ties in RCC columns is to:

Resist bending Hold longitudinal bars in position Improve aesthetics Reduce deflection

Q81. Minimum clear cover for main reinforcement in RCC slabs should be:

10 mm 15 mm 20 mm 25 mm

Q82. Which of the following increases concrete workability?

Lower water-cement ratio More angular aggregates Use of admixtures Increased cement content only

Q83. Curing of concrete is necessary to:

Achieve strength Control temperature Prevent shrinkage All of these

Q84. Which type of stress is resisted effectively by concrete?

Tensile stress Compressive stress Shear stress Torsional stress

Q85. The maximum spacing of stirrups in RCC beams should not exceed:

100 mm 150 mm 300 mm 450 mm

Q86. In RCC beams, which reinforcement resists bending tension?

Shear reinforcement Longitudinal bars Stirrups Hooks

Q87. The minimum clear spacing between two parallel reinforcing bars should be:

5 mm 10 mm Diameter of bar Greater of bar diameter or 25 mm

Q88. Which of these factors affects the shrinkage of concrete the most?

Aggregate size Water-cement ratio Cement fineness Curing temperature

Q89. The maximum permissible deflection for RCC beams as per IS 456 is:

Span/180 Span/250 Span/360 Span/400

Q90. Which factor directly affects the durability of concrete?

Cement grade Water-cement ratio Aggregate porosity Formwork type

Q91. Which of the following is NOT a function of concrete cover?

Protect from corrosion Fire protection Increase strength of steel Aid bond between steel and concrete

Q92. The purpose of hooks at the ends of stirrups is to:

Increase strength Ensure anchorage Reduce deflection Reduce shear

Q93. In RCC columns, minimum number of longitudinal bars for circular section is:

4 6 8 12

Q94. Lapping of reinforcement bars is avoided in:

Tension zone of beams Column center Footings Slabs

Q95. Reinforced Cement Concrete was first used by:

Joseph Monier John Smeaton Thomas Telford Le Corbusier