Design of Masonry Structures Solved MCQs


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

A. high shrinkage
B. less strength
C. both (a) and (b)
D. none of above
Answer» A. high shrinkage

In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as

A. sum of thickness of both leaves
B. two-third of the sum of thickness of both the leaves
C. actual thickness of the stronger leaf
D. larger of (b) and (c)
Answer» D. larger of (b) and (c)

For earthquake resistant masonry buildings, the vertical distance between openings one above the other in a load bearing wall shall not be less than

A. 50 cm
B. 60 cm
C. 75 cm
D. 100 cm
Answer» B. 60 cm

The mode of failure of a very short masonry member having h/t ratio of less than 4 is by

A. shear
B. vertical tensile splitting
C. buckling
D. any of the above
Answer» A. shear

The basic stress in masonry units having height to width ratio of 1.5 may be increased by a factor of

A. 1.2
B. 1.4
C. 1.6
D. 2.0
Answer» C. 1.6

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

A. lateral restraint but not rotational restraint
B. rotational restraint but not lateral restraint
C. both lateral and rotational restraints
D. neither lateral nor rotational restraint
Answer» A. lateral restraint but not rotational restraint

A free standing brick wall 20 cm thick is subjected to a wind pressure of 75kg/m². The maximum height of wall from stability consideration is

A. 0.64 m
B. 0.96 m
C. 1.28 m
D. 1.5 m
Answer» A. 0.64 m

If 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

A. 0.75 h
B. 0.85 h
C. 1.0 h
D. 1.5 h
Answer» A. 0.75 h

For designing masonry components of a structure, seismic forces provision in the design calculation is not necessary for buildings constructed in

A. zone i only
B. zone i and ii
C. zone i, ii and iii
D. zone i, ii, iii and iv
Answer» B. zone i and ii

A 200 mm thick wall made of modular bricks is 5 m long between cross walls and 3.8 m clear height between RCC slabs at top and bottom. The slenderness ratio of the wall is

A. 15
B. 19
C. 20
D. 25
Answer» A. 15

Water retentivity for brick masonry should not be less than

A. 50 %
B. 60 %
C. 70 %
D. 80 %
Answer» C. 70 %

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

A. less than or equal to 1/24
B. less than or equal to 1/6
C. more than 1/24
D. less than or equal to 1/12
Answer» A. less than or equal to 1/24

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

A. 0
B. between 0 and 1
C. 1
D. greater than 1
Answer» D. greater than 1

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

A. 10 %
B. 25 %
D. 50 %
Answer» B. 25 %

For masonry work with solid bricks, consistency of mortar should be

A. 5 to 8 cm
B. 9 to 13 cm
C. 14 to 18 cm
D. 19 to 23 cm
Answer» B. 9 to 13 cm

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

A. 0.15 mpa
B. 0.125 mpa
C. 0.1 mpa
D. 0.075 mpa
Answer» A. 0.15 mpa

The thickness of each leaf of a cavity wall shall not be less than

A. 5 cm
B. 7.5 cm
C. 10 cm
D. 15 cm
Answer» B. 7.5 cm

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

A. 3
B. 5
C. 7.5
D. 10
Answer» D. 10

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

A. more
B. less
C. the same in both the cases
D. 100 %
Answer» B. less

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

A. 0 6
B. 0.75
C. 0.85
D. 0.95
Answer» C. 0.85

For strengthening a 50 m long and 5 m high straight compound wall built in brick work, which one of the following would be most suitable?

A. providing buttresses at certain intervals
B. providing a deeper foundation
C. using a richer mortar
D. using stronger bricks
Answer» A. providing buttresses at certain intervals

Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than

A. 10 cm
B. 15 cm
C. 20 cm
D. 30 cm
Answer» A. 10 cm
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