Design of Masonry Structures

21. Full restraint is provided by
(i) Foundation footing of a wall
(ii) Timber floor spanning on the wall and anchored to the wall
(iii) RCC slab with a minimum bearing of 10 cm on the wall
Of these statements

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

Correct answer: (D)
(i), (ii) and (iii) are correct

22. If 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

  1. 0.75 H
  2. 0.85 H
  3. 1.0 H
  4. 1.5 H

Correct answer: (A)
0.75 H

23. 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

  1. 10 %
  2. 25 %
  3. 33⅓ %
  4. 50 %

Correct answer: (B)
25 %

24. 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

  1. 0 6
  2. 0.75
  3. 0.85
  4. 0.95

Correct answer: (C)
0.85

25. 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

  1. 0
  2. Between 0 and 1
  3. 1
  4. Greater than 1

Correct answer: (D)
Greater than 1

26. In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as

  1. Sum of thickness of both leaves
  2. Two-third of the sum of thickness of both the leaves
  3. Actual thickness of the stronger leaf
  4. Larger of (B) and (C)

Correct answer: (D)
Larger of (B) and (C)

27. 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

  1. 0.4 kg/cm2
  2. 0.7 kg/cm2
  3. 1.0 kg/cm2
  4. 1.2 kg/cm2

Correct answer: (C)
1.0 kg/cm2

28. Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys
(i) Shall not exceed 12 if lime mortar is used
(ii) Shall not exceed 18 if cement lime mortar 1 : 2 : 9 is used
(iii) Shall not exceed 24 if cement mortar 1 : 6 is used Of these statements

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

Correct answer: (A)
(i) and (ii) are correct

29. Minimum compressive strength in N/mm2 for H1 type mortar used for masonry is

  1. 3
  2. 5
  3. 7.5
  4. 10

Correct answer: (D)
10

30. Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than

  1. 10 cm
  2. 15 cm
  3. 20 cm
  4. 30 cm

Correct answer: (A)
10 cm

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