Design of Masonry Structures Civil Objective Questions - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. 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

2. 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)

3. 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.
(A) Both A and R is true and R is the correct explanation of A
(B) Both A and R is true but R is not a correct explanation of A
(C) A is true but R is false
(D) A is false but R is true

4. 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

5. 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

6. 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
(A) 4 %
(B) 5 %
(C) 6 %
(D) 7 %

7. Consider the following statements regarding bands to be provided for strengthening masonry work in masonry buildings constructed in zone III, IV and V.
(i) Lintel band is provided at lintel level on partition walls,
(ii) Gable band is provided at top of gable masonry below the purlins,
(iii) The bands shall be to full width of the wall and not less than 7.5 cm in depth,
(iv) The bands shall be made of reinforced concrete only.
Of these statements, the correct statements are
(A) (i) and (ii)
(B) (i) and (iii)
(C) (ii) and (iv)
(D) (ii) and (iii)

8. 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

9. 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

10. A free standing brick wall 20 cm thick is subjected to a wind pressure of 75 kg/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

11. 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.
Of these statements
(A) 1 alone is correct
(B) 2 alone is correct
(C) Both 1 and 2 are correct
(D) Neither 1 nor 2 is correct

12. 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
(A) 0.75 H
(B) 0.85 H
(C) 1.0 H
(D) 1.5 H

13. 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

14. 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

15. Water retentivity for brick masonry should not be less than
(A) 50 %
(B) 60 %
(C) 70 %
(D) 80 %

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