# Design of RC Structures Questions and Answers – Singly Reinforced Beams – Neutral Axis

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Singly Reinforced Beams – Neutral Axis”.

1. What is the line of intersection of neutral layer with the beam section called?
a) Neutral Axis
b) Horizontal Axis
c) Vertical Axis
d) Centroidal Axis

Explanation: Neutral Axis is the straight line dividing the crossection between tension and compression zone.

2. The concrete in the ______ zone should not be taken into account while determining the neutral axis.
a) Compression
b) Neutral Zone
c) Centroidal Zone
d) Tension Zone

Explanation: For RC beam, tension is carried completely by steel so concrete in the tension zone should not be considered while deciding the neutral axis.

3. If the area of reinforcement is At and the tensile stress in the reinforcement is t. What will be the total tension resisted?
a) T.At
b) m.t.At
c) m.t.Ct
d) m.At.Ct

Explanation: T = Ast
= At.m.Ct
= (mAt) Ct

4. Write the formula for percentage of steel.
a) 50n12/m(1-n1)
b) 100 n12/m(1-n1)
c) n12/m(1-n1)
d) m/ n12 (1-n1)

Explanation: Where n1 = m / (m+r)
m is modular ratio

5. What is the reason to use slump cone test in concrete?
a) To determine shrinkage of concrete mix
b) To check the creep of concrete
c) To find the workability of concrete
d) To determine the soundness of concrete

Explanation: Slump cone test is done to determine whether the concrete has enough pumpability and workability.

6. If the compaction factor of concrete is 0.80, then what is its workability?
a) Very low
b) Low
c) Medium
d) High

Explanation: Compaction factor less than 1 indicates that its workability is very low.

7. What is the factor of safety for steel in WSM?
a) 1.18
b) 1.8
c) 0.5
d) 1.15

Explanation: Factor of safety for concrete in WSM is upto 3 and for steel is 1.75 to 1.85

8. Select the correct specific weight for concrete from the following.
a) 25 kN/m3
b) 24 kN/m3
c) 20 kN/m3
d) 30 kN/m3

Explanation: Specific weight for concrete is mass/unit volume. Since unit volume of concrete contain 25 kN weight therefore specific weight for concrete is 25 kN/m3.

9. Which ingredient is used in the cement at maximum amount?
a) Gypsum
b) Silica
c) Lime
d) Fe2O4

Explanation: Main content for cement is lime and gypsum in which lime is used in the maximum amount.

10. What is the inert material used in cement concrete?
a) Sand
b) Cement
c) Aggregate
d) Fly Ash

Explanation: Aggregate is used in concrete to provide volume and strength to it.

Sanfoundry Global Education & Learning Series – Design of RC Structures

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