Design of Masonry Structures Multiple Choice Questions and Answers

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

A 5 to 8 cm

B 9 to 13 cm

C 14 to 18 cm

D 19 to 23 cm

Answer: 9 to 13 cm

2

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.

Select your answer according to the codes given below:

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

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

C A is true but R is false.

D A is false but R is true.

View Answer

Answer: A is true but R is false.

3 Which of the following will give higher ratio of brickwork strength to mortar strength ?

A 1 : % : 3

B 1 : Vz: 4>/2

C 1:1:6

D 1:2:9

View Answer

Answer: 1:2:9

4 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

View Answer

Answer: 10 cm

5 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

A (i) and (iii) are correct

B (i) and (ii) are correct

C (ii) and (iii) are correct

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

View Answer

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

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

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

View Answer

Answer: lateral restraint but not rotational restraint

7

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. Select your answer according to codes given below:

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

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

C A is true but R is false

D A is false but R is true.

View Answer

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

8 The mode of failure of a very short masonry member having h/t ratio of less than 4 is by

A shear

B vertical tensile splitting

C buckling

D any of the above

View Answer

Answer: shear

9 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

View Answer

Answer: Zone I and II

10 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

A 10%

B 25%

C 33 1/3%

D 50%

View Answer

Answer: 25%

11 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. Select your answer according to the codes give below:

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

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

C A is true but R is false.

D A is false but R is true.

View Answer

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

12 The bending stress in a wall or column subjected to effective vertical load need not be considered, if the eccentricity ratio is

A less than or equal to 1/24

B less than or equal to 1/6

C more than 1/24

D less than or equal to 1/12

View Answer

Answer: less than or equal to 1/24

13 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

A 0.64 m

B 0.96 m

C 1.28 m

D 1.5 m

View Answer

Answer: 0.64 m

14 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

View Answer

Answer: 0.85

15 The thickness of each leaf of a cavity wall shall not be less than

A 5 cm

B 7.5 cm

C 10 cm

D 15 cm

View Answer

Answer: 7.5 cm

16 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

View Answer

Answer: 0.75 H

17 The effective height of free standing nonload bearing wall and column respectively will be where H is the height of wall or column between centers of supports.

A 1.OH and 1.OH

B 1.5Handl.5H

C 2.0Handl.5H

D 2.0H and 2.0H

View Answer

Answer: 2.0H and 2.0H

18 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

A 4 percent

B 5 percent

C 6 percent

D 7 percent

View Answer

Answer: 7 percent

19 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

A (i) and (ii) are correct

B (ii) and (iii) are correct

C (i) and (iii) are correct

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

View Answer

Answer: (i) and (ii) are correct

20 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

A 0

B between 0 and 1

C 1

D greater than 1

View Answer