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Design of Masonry Structures

Free 40+ Design of Masonry Structures MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Design of Masonry Structures — MCQs for Pakistan government job tests

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Design of Masonry Structures

Practice questions

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1.What is the maximum allowable slenderness ratio for load-bearing walls in a building with more than two stories?

Both (i) and (ii) are accurateBoth (ii) and (iii) are accurateBoth (i) and (iii) are accurateAll (i), (ii), and (iii) are accurateNone of the above

2.Assertion (A): When the eccentricity ratio is greater than 1/6, the effective thickness of a masonry element decreases. Reason (R): An eccentricity ratio above 1/6 causes tension to develop on one side of the structural member.

Both A and R are correct, and R accurately explains A.Both A and R are correct, but R does not explain A.A is correct, but R is incorrect.A is incorrect, but R is correct.None of the above.

3.When the center-to-center distance of intersecting walls divided by the actual thickness of the intersecting wall exceeds 20, what is the stiffening coefficient assigned to the wall itself?

ZeroA value ranging from zero to oneExactly oneA value exceeding oneNone of the above

4.If a structural element or system offers lateral support to five or more walls or columns, what percentage of the total vertical load on the most heavily loaded wall or column should be considered as the lateral load to be resisted?

4 percent5 percent6 percent7 percent8 percent

5.Given that H represents the height of a wall measured between the centers of its supports, what is the effective height of the wall when concrete floors rest on it, regardless of the span direction?

0.75 times H0.85 times HEqual to H1.5 times HCannot be determined

6.Given that the horizontal cross-sectional area of a wall measures 1200 cm², what reduction factor should be applied to the basic stress?

0.600.700.850.90

7.When can bending stress be ignored in a wall or column subjected to an effective vertical load based on the eccentricity ratio?

If the eccentricity ratio is less than or equal to 1/24If the eccentricity ratio is less than or equal to 1/6If the eccentricity ratio exceeds 1/24If the eccentricity ratio is less than or equal to 1/12

8.Which combination of the following provides complete restraint?

Only statements (i) and (iii) are trueOnly statements (i) and (ii) are trueOnly statements (ii) and (iii) are trueAll statements (i), (ii), and (iii) are trueNone of the above

9.When designing masonry elements of a building, in which seismic zones is it unnecessary to include seismic force considerations in the design calculations?

Only in Seismic Zone IIn both Seismic Zones I and IIIn Seismic Zones I, II, and IIIIn Seismic Zones I, II, III, and IVNone of the above

10.Assertion (A): Most building codes limit the maximum slenderness ratio of masonry walls and columns to ensure structural integrity and cost-effectiveness. Reason (R): Limiting the slenderness ratio ensures that failure occurs due to excessive stress rather than buckling. Are these statements correct and is the reason a valid explanation for the assertion?

Both A and R are correct, and R properly explains A.Both A and R are correct, but R does not correctly explain A.A is correct, but R is incorrect.A is incorrect, but R is correct.Neither A nor R is correct.

11.What is the minimum required thickness for a stiffening wall in buildings with 1 to 3 floors?

10 centimeters15 centimeters20 centimeters30 centimeters

12.Assertion (A): Mortars made with lime exhibit a higher ratio of brickwork strength to mortar strength compared to mortars without lime. Reason (R): Lime-based mortars possess lower bond strength than mortars that do not contain lime. Evaluate the following statements:

Both A and R are correct, and R properly explains A.Both A and R are correct, but R does not explain A.A is correct, but R is incorrect.A is incorrect, but R is correct.None of the above.

13.In earthquake-resistant masonry structures where the seismic coefficient is below 0.08, what is the minimum required horizontal distance between two openings?

Vt multiplied by the height of the smaller openingVt multiplied by the height of the larger openingAx multiplied by the height of the smaller openingVi multiplied by the height of the larger opening

14.What is the minimum required water retention capacity for brick masonry?

50 percent60 percent70 percent80 percent90 percent

15.Why are rich cement mortars more prone to cracking than lean mortars?

They exhibit greater shrinkageThey possess lower strengthBoth increased shrinkage and reduced strengthNone of the above

16.Which of the following statements about bands used to reinforce masonry in buildings located in seismic zones III, IV, and V are correct?

Statements (i) and (ii)Statements (i) and (iii)Statements (ii) and (iv)Statements (ii) and (iii)None of the above

17.A 200 mm thick brick masonry wall constructed with modular bricks supports an axial load of 30 kN/m from the wall above and an eccentric load of 20 kN/m from the RCC floor. The eccentric load acts 47.5 mm away from the wall's centerline. What is the resultant eccentricity ratio?

0.900.951.001.051.10

18.Why are cement mortars with a mix richer than 1:3 generally avoided in masonry work?

Only statement (ii) is trueBoth statements (i) and (ii) are trueStatements (ii) and (iii) are trueAll statements (i), (ii), and (iii) are true

19.Which of the following statements about creating chases in masonry walls is accurate?

Statements (i) and (ii) are trueStatements (i) and (iii) are trueStatements (ii) and (iii) are trueStatements (i), (ii), and (iii) are trueNone of the above

20.What is the maximum allowable horizontal shear stress on the mortar bed joint area for masonry constructed with a 1:1:6 cement-lime-sand mortar mix or its equivalent?

0.15 MPa0.125 MPa0.10 MPa0.075 MPa

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