Practice Design Of Masonry Structures Multiple Choice Questions Quiz-1 - MCQGeeks.com

Q.1

For masonry built in 1 : 1 : 6 cement-lime-sand mix mortar or equivalent, the horizontal shear stress permissible on the area of a mortar bed joint is

0.15 MPa
0.125 MPa
0.1 MPa
0.075 MPa

Q.2

Direct load carrying capacity of a brick masonry wall standing freely as against when it supports RC slab will be

More
Less
The same in both the cases
100 %

Q.3

Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys
(i) Shall not exceed 12 if lime mortar is used
(ii) Shall not exceed 18 if cement lime mortar 1 : 2 : 9 is used
(iii) Shall not exceed 24 if cement mortar 1 : 6 is used

(ii) and (iii) are correct
(i) and (ii) are correct
(i) and (iii) are correct
(i) and (ii) and (iii) are correct

Q.4

The timber floor not spanning on the masonry wall but properly anchored to the wall gives

Lateral restraint but not rotational restraint
Rotational restraint but not lateral restraint
Both lateral and rotational restraints
Neither lateral nor rotational restraint

Q.5

Assertion A : For identical strength, a composite cement-lime mortar is preferred over cement mortar.
Reason R : Composite cement-lime mortar has higher drying shrinkage than cement mortar.
Select your answer based on the codes given below. Codes:

Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not a correct explanation of A
A is true but R is false
A is false but R is true

Q.6

If the eccentricity ratio is more than 1/24, then increase in the permissible stress in the design of wall subjected to eccentric loading as per code is

10 %
25 %
33? %
50 %

Q.7

A 200 mm thick brick masonry wall made of modular bricks carries an axial load of 30 kN/m from wall above and an eccentric load of 20 kN/m from RCC floor acting at a distance of 47.5 mm from the centre line of the wall. The resultant eccentricity ratio is

0.090
0.095
0.100
0.105

Q.8

If the ratio of center to center spacing of intersecting walls to actual thickness of intersecting wall is more than 20, then the stiffening coefficient for wall proper will be

0
Between 0 and 1
1
Greater than 1

Q.9

Where a structural component or a system is providing lateral support to five or more walls or columns, the lateral load to be resisted may be taken as __________ of the total vertical load on the most heavily loaded wall or column in the group

4 %
5 %
6 %
7 %

Q.10

Assertion A : From consideration of structural soundness and economy of design, most codes control the maximum slenderness ratio of masonry walls and columns.
Reason R : By controlling the maximum slenderness ratio, failure is by excessive stress and not by buckling.
Select your answer according to codes given below:

Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true

Q.11

Assertion A : Limiting value of slenderness ratio for a column is less than that of a wall.
Reason R : A column can buckle around either of the two horizontal axes while a wall can buckle around only one axis.
Select your answer according to the codes given below:

Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true

Q.12

The bending stress in a wall or column subjected to effective vertical load need not be considered, if the eccentricity ratio is

Less than or equal to 1/24
Less than or equal to 1/6
More than 1/24
Less than or equal to 1/12

Q.13

Consider the following statements:
1. Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.
2. Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.
3. Masonry in lime mortar has better resistance against rain penetration and is less liable to crack when compared to masonry in cement mortar.
Which of these statements are correct?

1, 2 and 3
1 and 2
2 and 3
1 and 3

Q.14

Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar.
Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars.
Select your answer according to the codes given below:

Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true

Q.15

If the horizontal cross-sectional area of a wall is 1200 cm², then the basic stress shall be multiplied by a reduction factor equal to

0.6
0.75
0.85
0.95

Q.16

If ‘H’ is the height of wall between centers of supports, then the effective height of wall where concrete floors have a bearing on wall irrespective of the direction of span will be

0.75 H
0.85 H
1.0 H
1.5 H

Q.17

Consider the following statements: The use of relatively weak mortar
1. Will accommodate movements due to loads and, cracking if any, and will be distributed as thin hair cracks which are less noticeable or harmful.
2. Will result in reduction of stresses due to differential expansion of masonry units.

1 alone is correct
2 alone is correct
Both 1 and 2 are correct
Neither 1 nor 2 is correct

Q.18

The effective height of free standing non-load bearing wall and column respectively will be

1.0H and 1.0H
1.5H and 1.5H
2.0H and 1.5H
2.0H and 2.0H

Q.19

Rich cement mortars are more liable to cracking as compared to lean mortars because rich mortars have

High shrinkage
Less strength
Both (A) and (B)
None of above

Q.20

Minimum compressive strength in N/mm² for H1 type mortar used for masonry is

3
5
7.5
10

0 h : 0 m : 1 s