design of masonry structures Mcqs
1. Consider the following statements regarding bands to be provided for strengthening masonry work in masonry buildings constructed in zone III, IV and V?
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A. ) Gable band is provided at top of gable masonry below the purlins,

B. i) The bands shall be to full width of the wall and not less than 7.5 cm in depth,

C. ) The bands shall be made of reinforced concrete only. </strong>

D. Lintel band is provided at lintel level on partition walls,
2. 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___________________?
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A. 1.28 m

B. 1.5 m

C. 0.64 m

D. 0.96 m

3. A high lime content in a composite cement-lime mortar results in______________?
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A. sider the following statements.

B. weaker mortar.</strong>

C. ect the correct statements.

D. slow hardening.

E. quick setting.

4. Water retentivity for brick masonry should not be less than__________________?
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A. 80%

B. 60%

C. 70%

D. 50%

5. Consider the following statements?
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A. ch of these statements are correct?

B. Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.

C. Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.

D. Masonry in lime mortar has better resistance against rain penetration and is less liable to crack when compared to masonry in cement mortar.</strong>

6. 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 _______________?
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A. 0.4 kg/cm2

B. 1.2 kg/cm2

C. 0.7 kg/cm2

D. 1.0 kg/cm2
7. 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_________________?
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A. 25%

B. 50%

C. 10%

D. 33.33%

8. For designing masonry components of a structure, seismic forces provision in the design calculation is not necessary for buildings constructed in________________?
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A. Zone I, II, III and IV

B. Zone I, II and III

C. Zone I only

D. Zone I and II
9. Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than_______________?
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A. 20 cm

B. 10 cm

C. 15 cm

D. 30 cm

10. Assertion A : For eccentricity ratio exceeding 1/6, effective thickness of masonry will get reduced. Reason R : For eccentricity ratio exceeding 1/6, there will be tension on one side of the member?
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A. ect your answer according to the codes give below.

11. 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?
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A. using stronger bricks

B. providing buttresses at certain intervals

C. using a richer mortar

D. providing a deeper foundation

12. 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_____________?
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A. ect your answer based on the codes given below Codes?

13. The use of relatively weak mortar_______________?
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A. sider the following statements.

B. will result in reduction of stresses due to differential expansion of masonry units.</strong>

C. will accommodate movements due to loads and, cracking if any, and will be distributed as thin hair cracks which are less noticeable or harmful.
14. Full restraint is provided by__________________?
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A. foundation footing of a wall

B. ) RCC slab with a minimum bearing of 10 cm on the wall </strong>

C. ect the correct statment.

D. timber floor spanning on the wall and anchored to the wall

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.
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A. correct sequence of increasing order of their strengths is?

16. Consider the following statements regarding provision of chases in masonry_________________?
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A. No chase should be permitted in a half brick load-bearing wall,

B. i) Chases should be provided near to bearings of beams and lintels.</strong>

C. ect the the statements ?

D. ) Vertical chases should not be closer than 2 m in any stretch of a wall,

17. 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_______________?
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A. 0.15 MPa

B. 0.1 MPa

C. 0.075 MPa

D. 0.125 MPa

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

B. less

C. the same in both the cases

D. 100%

19. 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_______________?
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A. 5 percent

B. 7 percent

C. 6 percent

D. 4 percent

20. 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.?
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A. ect your answer according to codes given below.

21. Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys________________?
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A. correct statments is ?

B. shall not exceed 18 if cement lime mortar 1:2:9 is used

C. shall not exceed 12 if lime mortar is used

D. ) shall not exceed 24 if cement mortar 1:6 is used</strong>

22. Which of the following will give higher ratio of brickwork strength to mortar strength ?
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A. 1 : % : 3

B. 1:01:06

C. 1:2:9

D. 1 : Vz: 4>/2

23. Minimum compressive strength in N/mm2 for H1 type mortar used for masonry is_______________?
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A. 10

B. 3

C. 5

D. 7.5

24. For earthquake resistant masonry buildings, where seismic coefficient is less than 0.08, the horizontal distance between two openings shall not be less than_________________?
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A. Ax height of shorter opening

B. Vt x height of shorter opening

C. Vi x height of longer opening

D. Vt x height of longer opening

25. The effective height of free standing nonload bearing wall and column respectively will be_________________?
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A. 2.0H and 2.0H

B. 1.OH and 1.OH

C. 1.5Handl.5H

D. 2.0Handl.5H

26. Cement mortars richer than 1 : 3 are not used in masonry because_________________?
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A. there is high shrinkage

B. there is no gain in strength of masonry

C. ) they are prone to segregation</strong>

D. ect the correct statements?

27. 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?
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A. ect your answer according to the codes given below.

28. 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.
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A. ect your answer according to the codes given below.

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

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

D. A is true but R is false.

E. A is false but R is true.

29. In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as________________?
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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)
30. The thickness of each leaf of a cavity wall shall not be less than_________________?
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A. 5 cm

B. 15 cm

C. 7.5 cm

D. 10 cm

31. For earthquake resistant masonry buildings, the vertical distance between openings one above the other in a load bearing wall shall not be less than_________________?
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A. 60 cm

B. 50 cm

C. 75 cm

D. 100 cm

32. The mode of failure of a very short masonry member having h/t ratio of less than 4 is by _______________?
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A. any of the above

B. buckling

C. shear

D. vertical tensile splitting

33. 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_________________?
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A. greater than 1

B. between 0 and 1

C. 1

D. 0

34. 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 A. B. C. D. ?
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A. 95

B. 90

C. 100

D. 5

35. 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________________?
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A. 20

B. 15

C. 19

D. 25

36. The timber floor not spanning on the masonry wall but properly anchored to the wall gives________________?
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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

37. The basic stress in masonry units having height to width ratio of 1.5 may be increased by a factor of_________________?
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A. 2

B. 1.4

C. 1.6

D. 1.2

38. 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________________?
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A. 1.0 H

B. 0.85 H

C. 1.5 H

D. 0.75 H
39. The bending stress in a wall or column subjected to effective vertical load need not be considered, if the eccentricity ratio is_________________?
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A. less than or equal to 1/24

B. more than 1/24

C. less than or equal to 1/6

D. less than or equal to 1/12

40. Rich cement mortars are more liable to cracking as compared to lean mortars because rich mortars have________________?
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A. high shrinkage

B. less strength

C. both (A) and (B)

D. none of above

41. 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________________?
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A. 0.85

B. 0 6

C. 0.75

D. 0.95