Design of Masonry Structures Objective Questions Set – 03

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Q1. Consider the following statements: The use of relatively weak mortar
Will accommodate movements due to loads and, cracking if any, and will be distributed as thin hair cracks which are less noticeable or harmful.
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

Answer: (C) Both 1 and 2 are correct

Q2. 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

(A) 0.6
(B) 0.75
(C) 0.85
(D) 0.95

Answer: (C) 0.85

Q3. Water retentivity for brick masonry should not be less than

(A) 50 %
(B) 60 %
(C) 70 %
(D) 80 %

Answer: (C) 70 %

Q4. Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than

(A) 10 cm
(B) 15 cm
(C) 20 cm
(D) 30 cm

Answer: (A) 10 cm

Q5. 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

Answer: (A) 0.75 H

Q6. 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?

(A) Providing buttresses at certain intervals
(B) Providing a deeper foundation
(C) Using a richer mortar
(D) Using stronger bricks

Answer: (A) Providing buttresses at certain intervals

Q7. 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

Answer: (B) Zone I and II

Q8. Cement mortars richer than 1 : 3 are not used in masonry because
(i) There is no gain in strength of masonry
(ii) There is high shrinkage
(iii) They are prone to segregation
Of these statements

(A) Only (ii) is correct
(B) (i) and (ii) are correct
(C) (ii) and (iii) are correct
(D) (i), (ii) and (iii) are correct

Answer: (B) (i) and (ii) are correct

Q9. 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

Answer: (A) 15

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