Civil Engineering MCQs

Page No. 104

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_____________?


aBoth A and R are true and R is the correct explanation of A.


bBoth A and R are true but R is not a correct explanation of A.


cA is true but R is false.


dA is false but R is true



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?


aproviding buttresses at certain intervals


bproviding a deeper foundation


cusing a richer mortar


dusing stronger bricks



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


a 1.2


b1.4


c 1.6


d 2.0


View Answer 1.6

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________________?


a15


b19


c20


d25


View Answer 15

The mortars used for masonry construction are classified based on strength in IS 2250 and IS 1905 according to their designations L1,L2, H1, H2, M, M2.


a LLLZ.HLHI.MLMJ


bL2,L,,M2>Mi,H2)H,


cM,,M2, H,,H2,Li,L2


dL2,L,,M,,M2,H,,H2


View Answer L2,L,,M2>Mi,H2)H,

In the case of panel wall subjected to horizontal loads at right angles to the plane of the wall, with the mortar not leaner than Ml type, tensile stress in bending in the vertical direction may be allowed to the extent of _______________?


a 0.4 kg/cm2


b0.7 kg/cm2


c1.0 kg/cm2


d1.2 kg/cm2


View Answer 1.0 kg/cm2

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.


a Both A and R are true and R is the correct explanation of A.


bBoth A and R are true but R is not the correct explanation of A.


c A is true but R is false.


dA is false but R is true.



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


amore


bless


c the same in both the cases


d 100%


View Answer less

A high lime content in a composite cement-lime mortar results in______________?


a slow hardening.


b quick setting.


cweaker mortar.


dA and C are correct


View Answer A and C are correct

The use of relatively weak mortar_______________?


awill accommodate movements due to loads and, cracking if any, and will be distributed as thin hair cracks which are less noticeable or harmful.


bwill result in reduction of stresses due to differential expansion of masonry units.


cA alone is correct


d both A and B are correct



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