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.
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.4.
Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys(i) Shall not exceedif lime mortar is used(ii) Shall not exceedif cement lime mortar 1 : 2 : 9 is used(iii) Shall not exceedif cement mortar 1 : 6 is used
(i) and (ii) are correct
(ii) and (iii) are correct
(i) and (iii) are correct
(i) and (ii) and (iii) are correct
Q.5.
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.6.
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.7.
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.8.
Consider the following statements: The use of relatively weak mortarWill accommodate movements due to loads and, cracking if any, and will be distributed as thin hair cracks which are less noticeable or harmful.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.9.
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.10.
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.11.
Consider the following statements:Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.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.12.
Amm thick brick masonry wall made of modular bricks carries an axial load ofkN/m from wall above and an eccentric load ofkN/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.13.
If the eccentricity ratio is more than 1/then increase in the permissible stress in the design of wall subjected to eccentric loading as per code is
10 %
25 %
33? %
50 %
Q.14.
Cement mortars richer than 1 : 3 are not used in masonry because(i) There is no gain in strength of masonry(ii) There is high shrinkage(iii) They are prone to segregation
Only (ii) is correct
(i) and (ii) are correct
(ii) and (iii) are correct
(i), (ii) and (iii) are correct
Q.15.
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.16.
If the horizontal cross-sectional area of a wall iscm², then the basic stress shall be multiplied by a reduction factor equal to
0.6
0.75
0.85
0.95
Q.17.
If the ratio of center to center spacing of intersecting walls to actual thickness of intersecting wall is more thanthen the stiffening coefficient for wall proper will be
0
Between 0 and 1
1
Greater than 1
Q.18.
The mode of failure of a very short masonry member having h/t ratio of less than 4 is by
Shear
Vertical tensile splitting
Buckling
Any of the above
Q.19.
In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as
Sum of thickness of both leaves
Two-third of the sum of thickness of both the leaves
Actual thickness of the stronger leaf
Larger of (B) and (C)
Q.20.
Amm 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
15
19
20
25
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