# Building Construction Questions and Answers – Effective Height of Wall

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This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Effective Height of Wall”.

1. The effective height of a wall is used for computing ________ ratio.
a) Thickness
b) Stress
c) Slenderness
d) Lateral support

Explanation: The effective height of a wall denoted by h, is used to compute the slenderness ratio. It is the ratio of effective height or effective length, whichever is less and the effective thickness of the wall.

2. Effective height of a wall is the function of __________ of the wall.
a) Weight
b) Mass
c) Actual height
d) Thickness

Explanation: The effective height of a wall is the function of the actual height of the wall which is denoted by H. It is also a function the lateral support condition. It is used for computing the slenderness ratio.

3. The effective height of a wall of actual height H, partially restrained at one end and laterally restrained at the other end is __________
a) 0.85H
b) 0.75H
c) 1.00H
d) 1.50H

Explanation: The effective height of a wall of actual height H, partially restrained at one end and laterally restrained at the other end is 0.85H. It includes timber below or above and roof trusses above a reinforced concrete floor.
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4. The actual height of the wall represented by H is the height of the wall between the __________ of support.
a) Centers
b) Ends
c) Edges
d) Faces

Explanation: H is the height of the wall which is measured between the centers of support. It is known as the actual height of the wall and is used to determine the effective height of the wall.

5. The effective height of a wall of actual height H, partially restrained at the bottom and having no lateral support at the top is __________
a) 0.85H
b) 0.75H
c) 1.00H
d) 1.50H

Explanation: The effective height of a wall of actual height H partially restrained at the bottom and having no lateral support at the top is 1.50H. This is also true if it has no rotational support at the top.

6. The effective height of a wall of actual height H when it is supported by free-standing non-load bearing members is __________
a) 0.85H
b) 0.75H
c) 1.00H
d) 2.00H

Explanation: The effective height of a wall of actual height H when it is supported by free-standing non-load bearing members is 2.00H. Non-load bearing members are those which can carry their own weight only. They do not carry any superimposed loads.

7. Effective height of a masonry wall is calculated using equation h = ρH where ρ represents __________
a) Reduction factor
b) Expansion factor
c) Slenderness ratio
d) Basic compressive stress

Explanation: Effective height of a masonry wall is calculated using equation h = ρH. In this equation, h represents the effective height, H represents the actual height of the wall and ρ represents the reduction factor.

8. Reduction factor (ρ) for walls partially restrained at the top and bottom is __________
a) 0.60
b) 0.75
c) 0.80
d) 0.85

Explanation: The equation h = ρH is used for calculating the effective height of a wall. Reduction factor (ρ) for walls partially restrained at the top and bottom is 0.75.

9. Effective height of a wall is the function of the weight of the wall.
a) True
b) False

Explanation: The effective height of a wall depends on the actual height of the wall and the conditions of the support. The effective height of a wall is determined by multiplying the actual height of the wall with the reduction factor which depends on the conditions of the support.

10. The effective height of a column is ________ the actual height for the direction when it is not laterally supported.
a) Equal
b) Twice
c) Thrice
d) Four times

Explanation: The effective height of a column is twice the actual height for the direction it is not laterally supported. However, the effective height of a column is equal to the actual height for the direction it is laterally supported.

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