Design of Masonry Structures

11. Consider the following statements regarding provision of chases in masonry,
(i) No chase should be permitted in a half brick load-bearing wall,
(ii) Vertical chases should not be closer than 2 m in any stretch of a wall,
(iii) Chases should be provided near to bearings of beams and lintels. Of these statements

1. (i) and (ii) are correct
2. (i) and (iii) are correct
3. (ii) and (iii) are correct
4. (i), (ii) and (iii) are correct

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12. Consider the following statements:
1. Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.
2. Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.
3. 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. 1, 2 and 3
2. 1 and 2
3. 2 and 3
4. 1 and 3

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13. Consider the following statements:
A high lime content in a composite cement-lime mortar results in
1. Slow hardening.
2. Quick setting.
3. Weaker mortar. Of these statements

1. 2 and 3 are correct
2. 1 and 2 are correct
3. 1 and 3 are correct
4. 1, 2 and 3 are correct

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14. 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

1. 1 alone is correct
2. 2 alone is correct
3. Both 1 and 2 are correct
4. Neither 1 nor 2 is correct

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

1. More
2. Less
3. The same in both the cases
4. 1

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

1. Zone I only
2. Zone I and II
3. Zone I, II and III
4. Zone I, II, III and IV

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

1. 50 cm
2. 60 cm
3. 75 cm
4. 100 cm

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18. 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

1. 0.15 MPa
2. 0.125 MPa
3. 0.1 MPa
4. 0.075 MPa

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

1. 5 to 8 cm
2. 9 to 13 cm
3. 14 to 18 cm
4. 19 to 23 cm

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20. 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?

1. Providing buttresses at certain intervals
2. Providing a deeper foundation
3. Using a richer mortar
4. Using stronger bricks

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