# Design of RC Structures Questions and Answers – Shear Reinforcement Vertical Stirrups

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Shear Reinforcement Vertical Stirrups”.

1. Write the formula for pitch of vertical stirrups.
a) Aw. tw. a / S
b) a / S
c) tw. a / S
d) S / a

Explanation: p = Aw. tw. a / S
Where, p = pitch
Aw = Area of One Stirrup
tw = Allowable Stress
S = Total Load on Stirrup

2. The spacing of stirrups can be increased towards the centre.
a) True
b) False

Explanation: Since the shear force decreases from the end towards the centre, the spacing of these stirrups will be close at the ends and can be increased towards the centre.

3. The spacing of these stirrups shall not exceed the ______ distance of the beam.
a) Spacing
b) Cover
c) Lever Arm
d) Neutral Axis

Explanation: As per conventional practice, the spacing of these stirrups shall not exceed the lever arm distance of the beam.

4. The failure in concrete which refers to the separation of ingredients while placing.
a) Segregation
b) Shrinkage
c) Collapse
d) Creep

Explanation: Segregation refers to the separation of ingredients while placing the concrete.

5. Which of the following is directly related to workability of concrete?
a) Cement
b) Aggregate–Cement Ratio
d) Transit

Explanation: Grade of the aggregate and workability of concrete is directly proportional to each other.

6. What is the approximate value of shrinkage in concrete?
a) 0.3
b) 0.03
c) 0.003
d) 0.0003

Explanation: According to Code IS 456:200, the value of shrinkage in concrete is 0.0003.

7. Air entertainment in concrete increases _____
a) Workability
b) Strength
c) Durability
d) Unit Weight

Explanation: When the amount of air in concrete increases, its workability increases as the ingredients gets more air contents and the remaining voids are filled with air.

8. Strength of the concrete increases with _______
a) Fineness of cement
b) Water Content
c) Size of aggregate
d) Amount of sand

Explanation: Cement is the binding material and strength provider of concrete so when the grade of the cement improves, its strength increases.

9. What is the modulus of elasticity for steel?
a) 100kN/mm2
b) 200N/mm2
c) 200kN/mm2
d) 200kN/cm2

Explanation: According to Code IS 456:2000, the modulus of elasticity for steel is taken as 200kN/mm2

10. In the case of hand mixing, the extra cement should be ______
a) 5%
b) 10%
c) 15%
d) 20%

Explanation: When the concrete is hand mixed, the cement is taken extra because of some losses, and the poor mixing. When the cement is taken extra then it covers all the material ingredients of concrete.

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