# Design of RC Structures Questions and Answers – Shear in Beams – Revised Theory as per IS Code

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Shear in Beams – Revised Theory as per IS Code”.

1. What is the other name of St. Venant’s theory?
a) Principal strain theory
b) Principal stress theory
c) Nominal stress theory
d) Nominal strain theory

Explanation: St. Venant’s theory states that the difference between the effects of two different but statically equivalent loads becomes very small at sufficiently large distances from load.

2. Which theory is best suitable for brittle materials?
a) Maximum principal strain theory
b) Maximum principal strain theory
c) Shear stress theory
d) Shear strain theory

Explanation: The theory best suitable for brittle materials is maximum principal stress theory because it suggests the properties of it keeping in mind the nature of brittle materials.

3. What is the other name of Von Mises theory?
a) Shear stress theory
b) Shear strain theory
c) Nominal stress theory
d) Nominal strain theory

Explanation: Von Mises theory suggests that the yielding of ductile material begins what the second stress invariant reaches critical value.

4. What do we call the process of hardening of concrete in the presence of water?
a) Hydration
b) Hardening
c) Curing
d) Creep

Explanation: Hydration is the process in which concrete gets harder in the presence of water. Curing is very necessary to keep the cracks away from concrete.

5. What is the weight of 1 cubic meter of cement?
a) 1000 kg
b) 1200 kg
c) 1440 kg
d) 1500 kg

Explanation: According to Code of Indian standards, 1 cubic metre of cement weighs 1440 kg.

6. Role of Fly Ash in concrete.
a) Act as strength
b) Act as lime
c) Act as gypsum
d) Act as pozzolans

Explanation: Cement can be replaced by fly ash by up to 25% in it. More than 75% of all concrete is made with fly ash.

7. What is the maximum shear stress for M20 grade of Concrete?
a) 1.2 N/mm2
b) 2.8 N/mm2
c) 3.6 N/mm2
d) 4.2 N/mm2

Explanation: According to Code IS:456-2000, the maximum shear stress for M20 grade of concrete is 2.8 N/mm2

8. What should be the width of stairs in public buildings?
a) 1000mm
b) 1500mm
c) 1800mm
d) 2000mm

Explanation: According to Building Standards and IS Codes, the width of stairs in public buildings should be at least 1800mm.

9. What should be the maximum slenderness ratio for short column?
a) 12
b) 18
c) 24
d) 30

Explanation: According to IS Code 465, the maximum slenderness ratio for short column should be 465.

10. Steel beam theory is used to design singly reinforced beams.
a) True
b) False

Explanation: Steel beam theory is used to design doubly reinforced beams, not the singly reinforced beams.

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