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

1. The condition on which bending stress depends is ______

a) Bending Moment

b) Shear Force

c) Thrust

d) Strength

View Answer

Explanation: Bending stress totally depends on bending moment as if moment increases, stress increases at certain limit.

2. Bending stress can also be termed as ____

a) Longitudnal Stress

b) Shear Stress

c) Hoop Stress

d) Perfect Shear

View Answer

Explanation: Bending Stress occurs along the longitudinal axis of beam so bending stress is also termed as longitudinal stress.

3. Neutral axis of the beam is the axis of ______

a) Maximum stress

b) Positive stress

c) Negative stress

d) Zero stress

View Answer

Explanation: Stress at the neutral axis of the beam is zero so it is the axis of zero stress.

4. What is the correct formula for section modulus?

a) I/y

b) I.y

c) y/I

d) 2I/y

View Answer

Explanation: section modulus is denoted by z and in the formula, I stands for moment of inertia and y stands for distance from neutral axis.

5. Where will be the maximum tensile stress at the simply supported beam having UDL at total span?

a) Neutral Axis

b) Top Fiber

c) Bottom Fiber

d) Conditions are not enough to determine

View Answer

Explanation: At bottom fiber, there is maximum stress because the maximum loading is transferred to the bottom axis of the beam.

6. What will be the result of failure in the concrete block?

a) Diagonal Tension

b) Bottom Failure

c) Shear

d) Creep

View Answer

Explanation: Concrete is 10 times stronger in compression than steel, hence if a concrete block is subjected to shear stress it may result to diagonal tension.

7. When the shear reinforcement is provided vertically, they are called ________

a) Shear spacing

b) Shear stirrups

c) Stirrups

d) Spacing

View Answer

Explanation: These consist of 6mm to 10mm diameter bars bent round the tensile reinforcement.

8. What does σ represents in the bending equation?

a) Stress at top

b) Stress at bottom

c) Stress at centre

d) Stress at distance y from neutral axis

View Answer

Explanation: Bending equation is M/I = σ/y = E/R

Where σ represents stress and M represents moment

9. What do I represent in bending equation?

a) Moment of inertia about axis about which bending occurs

b) Moment of inertia about vertical

c) Moment of inertia horizontal

d) Varies according to conditions

View Answer

Explanation: Bending equation is M/I = σ/y = E/R

Where σ represents stress and M represents moment

And I represents Moment of inertia about axis about which bending occurs.

10. Find the section modulus for circular section of diameter 28mm.

a) 2155.1

b) 2000.5

c) 1895.7

d) 1806.8

View Answer

Explanation: Z = πd

^{3}/ 32

= π. 28

^{3}/ 32 = 2155.1

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