RCC Structures Design MCQ Questions & Answers

21

If p₁ and p₂ are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

A) $$\frac{{{{\text{p}}_1} - {{\text{p}}_2}}}{2}{\text{h}}$$ B) $$\frac{{{{\text{p}}_1} + {{\text{p}}_2}}}{4}{\text{h}}$$ C) $$\frac{{{{\text{p}}_1} + {{\text{p}}_2}}}{2}{\text{h}}$$ D) $$\left( {{{\text{p}}_1} - {{\text{p}}_2}} \right)\frac{2}{3}{\text{h}}$$

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Answer & Solution

Answer: Option C

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22

To ensure uniform pressure distribution, the thickness of the foundation, is

A) Kept uniform throughout B) Increased gradually towards the edge C) Decreased gradually towards the edge D) Kept zero at the edge

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Answer & Solution

Answer: Option C

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23

The design of a retaining wall assumes that the retained earth

A) Is dry B) Is free from moisture C) Is not cohesive D) All the above

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Answer & Solution

Answer: Option D

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24

Steel beam theory is used for

A) Design of simple steel beams B) Steel beams encased in concrete C) Doubly reinforced beams ignoring compressive stress in concrete D) Beams if shear exceeds 4 times allowable shear stress

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Answer & Solution

Answer: Option C

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25

Thickened part of a flat slab over its supporting column, is technically known as

A) Drop panel B) Capital C) Column head D) None of these

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Answer & Solution

Answer: Option A

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26

Enlarged head of a supporting column of a flat slab is technically known as

A) Supporting end of the column B) Top of the column C) Capital D) Drop panel

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Answer & Solution

Answer: Option C

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27

The length of the straight portion of a bar beyond the end of the hook, should be at least

A) Twice the diameter B) Thrice the diameter C) Four times the diameter D) Seven times the diameter

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Answer & Solution

Answer: Option C

Solution:

Reason: As per standard RCC detailing practice (IS 2502/IS 456), a hooked bar must have a straight extension beyond the hook to ensure adequate anchorage and prevent slip.

Minimum requirement: The straight portion beyond the end of the hook should be at least 4ϕ, where ϕ is the bar diameter.

Why 4ϕ? This length ensures the bearing and bond developed by the hook is effectively transferred into the concrete without premature pull-out or cracking at the bend.

28

The maximum permissible size of aggregates to be used in casting the ribs of a slab, is

A) 5 mm B) 7.5 mm C) 10 mm D) 15 mm

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Answer & Solution

Answer: Option C

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29

If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

A) $$\frac{{{\text{w}}{l^2}}}{4}$$ B) $$\frac{{{\text{w}}{l^2}}}{8}$$ C) $$\frac{{{\text{w}}{l^2}}}{{10}}$$ D) $$\frac{{{\text{w}}{l^2}}}{{12}}$$

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Answer & Solution

Answer: Option B

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30

A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds

A) 10 B) 15 C) 20 D) 25

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Answer & Solution

Answer: Option B

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RCC Structures Design MCQ Questions & Answers | Civil Engineering