Design Of Masonry Structures MCQ

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• The timber floor not spanning on the masonry wall but properly anchored to the wall gives
  ক

  Lateral restraint but not rotational restraint

  খ

  Rotational restraint but not lateral restraint

  গ

  Both lateral and rotational restraints

  ঘ

  Neither lateral nor rotational restraint
• Maximum slenderness ratio of load bearing walls for a dwelling having more than 2 storeys<br>(i) Shall not exceed 12 if lime mortar is used<br>(ii) Shall not exceed 18 if cement lime mortar 1 : 2 : 9 is used<br>(iii) Shall not exceed 24 if cement mortar 1 : 6 is used
  ক

  (i) and (ii) are correct

  খ

  (ii) and (iii) are correct

  গ

  (i) and (iii) are correct

  ঘ

  (i) and (ii) and (iii) are correct
• Direct load carrying capacity of a brick masonry wall standing freely as against when it supports RC slab will be
  ক

  More

  খ

  Less

  গ

  The same in both the cases

  ঘ

  100%
• 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
  ক

  0.15 MPa

  খ

  0.125 MPa

  গ

  0.1 MPa

  ঘ

  0.075 MPa
• Rich cement mortars are more liable to cracking as compared to lean mortars because rich mortars have
  ক

  High shrinkage

  খ

  Less strength

  গ

  Both (A) and (B)

  ঘ

  None of above
• The effective height of free standing non-load bearing wall and column respectively will be
  ক

  1.0H and 1.0H

  খ

  1.5H and 1.5H

  গ

  2.0H and 1.5H

  ঘ

  2.0H and 2.0H
• Consider the following statements: The use of relatively weak mortar<br>(i) Will accommodate movements due to loads and cracking if any and will be distributed as thin hair cracks which are less noticeable or harmful.<br>(ii) Will result in reduction of stresses due to differential expansion of masonry units.
  ক

  (i) alone is correct

  খ

  (ii) alone is correct

  গ

  Both (i) and (ii) are correct

  ঘ

  Neither (i) nor (ii) is correct
• Assertion A : Limiting value of slenderness ratio for a column is less than that of a wall.<br>Reason R : A column can buckle around either of the two horizontal axes while a wall can buckle around only one axis.<br>Select your answer according to the codes given below:
  ক

  Both A and R is true and R is the correct explanation of A

  খ

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

  গ

  A is true but R is false

  ঘ

  A is false but R is true
• Assertion A : From consideration of structural soundness and economy of design, most codes control the maximum slenderness ratio of masonry walls and columns.<br>Reason R : By controlling the maximum slenderness ratio, failure is by excessive stress and not by buckling. <br>Select your answer according to codes given below:
  ক

  Both A and R is true and R is the correct explanation of A

  খ

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

  গ

  A is true but R is false

  ঘ

  A is false but R is true
• Assertion A : Lime based mortars give higher ratio of brickwork strength to mortar strength as compared to non-lime mortar.<br>Reason R : Lime based mortars have lower bond strength as compared to non-lime mortars.<br>Select your answer according to the codes given below:
  ক

  Both A and R is true and R is the correct explanation of A

  খ

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

  গ

  A is true but R is false

  ঘ

  A is false but R is true
• Consider the following statements:<br>(i) Masonry in rich cement mortar though having good strength with high shrinkage is much liable for surface cracks.<br>(ii) Lime mortar possesses poor workability and poor water retentivity and also suffers high shrinkage.<br>(iii) Masonry in lime mortar has better resistance against rain penetration and is less liable to crack when compared to masonry in cement mortar.<br>Which of these statements are correct?
  ক

  (i), (ii) and (iii)

  খ

  (i) and (ii)

  গ

  (ii) and (iii)

  ঘ

  (i) and (iii)
• The bending stress in a wall or column subjected to effective vertical load need not be considered, if the eccentricity ratio is
  ক

  Less than or equal to $$\frac{1}{{24}}$$

  খ

  Less than or equal to $$\frac{1}{6}$$

  গ

  More than $$\frac{1}{{24}}$$

  ঘ

  Less than or equal to $$\frac{1}{{12}}$$
• 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
  ক

  0.090

  খ

  0.095

  গ

  0.100

  ঘ

  0.105
• If the eccentricity ratio is more than $$\frac{1}{{24}}$$, then increase in the permissible stress in the design of wall subjected to eccentric loading as per code is
  ক

  10%

  খ

  25%

  গ

  $$33\frac{1}{3}\% $$

  ঘ

  50%
• Cement mortars richer than 1 : 3 are not used in masonry because<br>(i) There is no gain in strength of masonry<br>(ii) There is high shrinkage<br>(iii) They are prone to segregation
  ক

  Only (ii) is correct

  খ

  (i) and (ii) are correct

  গ

  (ii) and (iii) are correct

  ঘ

  (i), (ii) and (iii) are correct
• 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
  ক

  0.75 H

  খ

  0.85 H

  গ

  1.0 H

  ঘ

  1.5 H
• 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
  ক

  0.6

  খ

  0.75

  গ

  0.85

  ঘ

  0.95
• 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.
  ক

  4%

  খ

  5%

  গ

  6%

  ঘ

  7%
• 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
  ক

  0

  খ

  Between 0 and 1

  গ

  1

  ঘ

  Greater than 1
• The mode of failure of a very short masonry member having h/t ratio of less than 4 is by
  ক

  Shear

  খ

  Vertical tensile splitting

  গ

  Buckling

  ঘ

  Any of the above
• In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as
  ক

  Sum of thickness of both leaves

  খ

  Two-third of the sum of thickness of both the leaves

  গ

  Actual thickness of the stronger leaf

  ঘ

  Larger of (B) and (C)
• 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
  ক

  15

  খ

  19

  গ

  20

  ঘ

  25
• For designing masonry components of a structure, seismic forces provision in the design calculation is not necessary for buildings constructed in
  ক

  Zone I only

  খ

  Zone I and II

  গ

  Zone I, II and III

  ঘ

  Zone I, II, III and IV
• Minimum compressive strength in N/mm² for H₁ type mortar used for masonry is
  ক

  3

  খ

  5

  গ

  7.5

  ঘ

  10
• The basic stress in masonry units having height to width ratio of 1.5 may be increased by a factor of
  ক

  1.2

  খ

  1.4

  গ

  1.6

  ঘ

  2.0
• Consider the following statements regarding provision of chases in masonry,<br>(i) No chase should be permitted in a half brick load-bearing wall,<br>(ii) Vertical chases should not be closer than 2 m in any stretch of a wall,<br>(iii) Chases should be provided near to bearings of beams and lintels.
  ক

  (i) and (ii) are correct

  খ

  (i) and (iii) are correct

  গ

  (ii) and (iii) are correct

  ঘ

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

  (i) and (ii)

  খ

  (i) and (iii)

  গ

  (ii) and (iv)

  ঘ

  (ii) and (iii)
• Assertion A: For eccentricity ratio exceeding $$\frac{1}{6}$$, effective thickness of masonry will get reduced.<br>Reason R: For eccentricity ratio exceeding $$\frac{1}{6}$$, there will be tension on one side of the member.<br>Select your answer according to the codes give below:
  ক

  Both A and R is true and R is the correct explanation of A

  খ

  Both A and R is true and R is not the correct explanation of A

  গ

  A is true but R is false

  ঘ

  A 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?
  ক

  Providing buttresses at certain intervals

  খ

  Providing a deeper foundation

  গ

  Using a richer mortar

  ঘ

  Using stronger bricks
• Consider the following statements:<br>A high lime content in a composite cement-lime mortar results in<br>(i) Slow hardening<br>(ii) Quick setting<br>(iii) Weaker mortar
  ক

  (ii) and (iii) are correct

  খ

  (i) and (ii) are correct

  গ

  (i) and (iii) are correct

  ঘ

  (i), (ii) and (iii) are correct