This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Sources of Dampness – Set 2”.
1. Poor quality of construction material is also the primary cause for dampness.
a) True
b) False
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Explanation: The construction material such as concrete, brick and plaster used if of poor quality then the interconnected voids which are present in them act as a passage of water flow into the structure when they come in contact with water.
2. Presence of gutter near the building may create dampness near the __________ walls.
a) internal
b) panel
c) free standing
d) external
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Explanation: When the gutters are provided near the building then the rain water running through the gutters may gets stagnant at sometimes inside the gutter which in course of time leads to the penetration of the stagnant water inside the building causing dampness.
3. In adequate roof slopes act as a major cause for dampness.
a) True
b) False
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Explanation: Defective junction between the roof slab and parapet wall may occur when the slopes to the roof are not provided with caution which then leads to the penetration of rain water into the building causing dampness.
4. In which of the following treatment the water proofing materials are added to the construction material?
a) Membrane damp proofing
b) Surface treatment
c) Integral treatment
d) Cavity wall construction
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Explanation: Some water proofing materials like chalk, tale or feller’s earth id added during the mixing process of the construction material in the integral treatment and this material fills the pores of the mortar which stops the penetration of water into the materials.
5. In which of the following treatment the joints in the brickwork or stonework are pointed?
a) Membrane damp proofing
b) Surface treatment
c) Integral treatment
d) Cavity wall construction
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Explanation: In surface treatment, the joints in the brickwork and stonework are pointed in order to avoid the penetration of water into the building. When the joints are pointed then the water reaching joints are diverted down and it doesn’t enter the building.
6. In which of the following treatment damp proof course is used?
a) Membrane damp proofing
b) Surface treatment
c) Integral treatment
d) Cavity wall construction
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Explanation: In membrane proof damping, a layer of damp proof course material is used between the source that causes dampness and the part of the structure which is adjacent to dampness source in order to block the entry of water into the structure.
7. In which of the following treatment the main walls in the building are saved by outer skin wall?
a) Membrane damp proofing
b) Surface treatment
c) Integral treatment
d) Cavity wall construction
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Explanation: In cavity wall construction, an outer skin wall is constructed such that a cavity if formed between the outer wall which isolated the source of dampness form the main wall.
8. Proper treatment to the expansion and construction joint plays an important role in sealing the water entry into the building.
a) True
b) False
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Explanation: When the expansion and construction joints of the building are not properly treated with the water proofing material then it leads to the penetration of water into the building causing dampness. So they must be properly treated to avoid dampness.
9. _________ is provided in wall tops and parapets to avoid dampness.
a) Coping
b) Slope
c) Damp proof course
d) Gutters
View Answer
Explanation: When coping is provided in the wall tops and parapets, then the rain water reaching top of the wall and parapet just descends through the coping and it reaches the ground thereby avoiding dampness in the building.
10. Absence of a physical damp proof course causes rising dampness.
a) True
b) False
View Answer
Explanation: When the damp proof course has defected then the direct contact of the building with the ground occurs which leads to the rising of dampness due to capillary action thereby causing dampness.
11. ________ faults are the internal source of dampness.
a) Plumbing
b) Cracking
c) Orientation
d) Isolation
View Answer
Explanation: When there is a plumbing fault such as leakage of valves or pipes it leads to the constant leakage of water from the pipe system which then penetrates into the building causing dampness.
12. When the wall cavity is blocked then it causes ________ dampness.
a) rising
b) penetration
c) internal
d) external
View Answer
Explanation: When the cavity of the walls is bridged then it acts as a way for the water to enter the building which causes dampness in the structure. So care must be taken during the construction of cavity walls to avoid bridging of the walls.
Sanfoundry Global Education & Learning Series – Repair and Rehabilitation of Structures.
To practice all areas of Repair and Rehabilitation of Structures, here is complete set of Multiple Choice Questions and Answers.
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