# Design of RC Structures Questions and Answers – Singly Reinforced Beams – Types of Bars Used in RCC

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Singly Reinforced Beams – Types of Bars Used in RCC”.

1. Which IS code is followed for designing of deformed medium tensile steel bars?
a) IS 456
b) IS 3320
c) IS 432
d) IS 1139

Explanation: IS 1139 is followed for medium tensile steel bars and IS 432 for deformed medium tensile steel bars and IS 132 for mild steel bars.

2. Which IS code is followed for designing medium tensile conforming bars?
a) IS 456
b) IS 3320
c) IS 432
d) IS 1139

Explanation: IS 432 is used for medium tensile conforming bars and IS 1139 is followed for medium tensile steel bars.

3. What is the permissible tensile stress for Mild steel conforming to grade I of IS: 432 up to 20mm?
a) 140N/mm2
b) 130 N/mm2
c) 190 N/mm2
d) 1140 N/mm2

Explanation: Permissible tensile stress for mild steel is 140 N/mm2 up to 20mm and 130 over 20mm.

4. What is the strength range of rebar bars?
a) 1k-40k psi
b) 20k-60k psi
c) 40k-80k psi
d) Over 80k psi

Explanation: Rebar comes in various strengths, and depending on the requirements it might vary from 20K to 60K psi, but lower strength is less expensive and more commonly used for rebar.

5. Deformed steel bars minimize the _____ in concrete.
a) Slippage
b) Bonding
c) Ribs
d) Lugs

Explanation: Deformed steel bar helps in minimizing the slippage in steel and increases the bonding between two materials.

6. The property of deforming the material without breaking is called _____
a) Elasticity
b) Plasticity
c) Ductility
d) Creep

Explanation: Elasticity is a property of a material by virtue of which it can regain its original shape without applying force to it.

7. What is the quantity of carbon in low carbon steel?
a) 0.6-1.5%
b) 0.3-0.6%
c) 0.5-1%
d) 1-5%

Explanation: Quantity of carbon in low carbon steel is 0.3-0.6% and in high carbon steel is 0.6-1.5%.

8. The bars with rough surface are called _______
a) Round steel bars
b) Deformed bars
c) Irregular bars
d) Rough bars

Explanation: The bars with rough surface are called deformed bars. They are widely used nowadays because of its many qualities like special bond with concrete.

9. The stress in such reinforcement in induced before the action of loading.
Which reinforcement is perfectly fit for above condition?
a) Pre Stressed Reinforcement
b) Ordinary Reinforcement
c) Torsion Reinforcement
d) Shear Reinforcement

Explanation: The stress in such reinforcement in the works of RCC is introduced before the action of the load by tensioning the steel.

10. Pre Stressed bars can with stand more load compared to regular bars.
a) True
b) False

Explanation: The stress in such reinforcement in the works of RCC is introduced before the action of the load by tensioning the steel that is why such type of reinforcement can with stand more loads that ordinary type of structures.

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