This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Materials for Damp Proof Course”.
1. An effective damp proofing material should be impervious.
a) True
b) False
View Answer
Explanation: Only when the damp proofing material is impervious it will not let the moisture get inside if not the moisture can easily penetrate the damp proofing material and so the damp proofing material should be impervious.
2. At which level of the structure the DPC is to be laid?
a) Sill level
b) Plinth level
c) Lintel level
d) Basement level
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Explanation: The DPC is to be laid at the plinth level to arrest the penetration of moisture at the base level of the building itself. Only then the major problem of dampness i.e. rising dampness can be prevented.
3. Which of the following mix ratio is commonly adopted for laying DPC?
a) M 25
b) M 30
c) M15
d) M 10
View Answer
Explanation: The cement concrete of ratio M15 (1:2:4) is generally adopted for laying DPC since it serves good under normal conditions than any other mix ratio.
4. Which of the following thickness is commonly adopted for laying DPC?
a) 15 mm
b) 30 mm
c) 12 mm
d) 25 mm
View Answer
Explanation: Generally, the DPC is laid to a thickness of 25 mm at the plinth level and this is sufficient enough to arrest the moisture into the building through capillary action.
5. In which of the following area the vertical DPC is adopted?
a) Portico
b) Balconies
c) Windows and doors
d) Parapet
View Answer
Explanation: The vertical DPC is mainly adopted around the windows and doors when they are built-in cavity walls so that moisture penetration into the building could be prevented.
6. The materials used as damp proof course (DPC) should be dimensionally stable.
a) True
b) False
View Answer
Explanation: When the DPC is dimensionally stable it doesn’t undergo expansion or contraction due to the temperature changes and maintains its property all through its life time. When it becomes dimensionally unstable it allows the penetration of water into it and so it should be dimensionally stable.
7. Which of the following factors affects the selection of DPC for a building?
a) Cost of DPC
b) Quality of DPC
c) Climatic condition of the building
d) Height of the building
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Explanation: The main factor that affects the selection of DPC for a building is the climactic condition in which the building is subjected to and based on that the DPC with the appropriate property is selected for installation.
8. DPC is laid ___________ the housing walls.
a) above
b) below
c) inside
d) outside
View Answer
Explanation: Usually the DPC is laid below the housing walls to arrest the rising dampness caused due to capillary action from the ground and thereby preventing the formation of damp patches in the underground layer of the building.
9. DPC is laid below the masonry walls only in case of load bearing walls.
a) True
b) False
View Answer
Explanation: DPC is laid below the masonry walls regardless of the type of wall. Whether it is load baring or partition wall the DPC must be laid below to prevent the penetration of water into the building.
10. The damp proof course (DPC) materials should be made of slats like sulphates and chlorides.
a) True
b) False
View Answer
Explanation: When DPC materials meets water ten the sulphates and chlorides present in the material dissolve and when it reaches the rebars then it causes corrosion. So the DPC materials should not contain any sulphates and chlorides.
11. Damp that is travelling sideways through the adjoining walls are arrested by ________
a) Vertical DPC
b) Horizontal DPC
c) DPM
d) Bitumen layer
View Answer
Explanation: Damp that is travelling sideways through the adjoining walls is arrested by providing vertical DPC around the windows and doors.
12. The damp proof course (DPC) materials should be able to withstand dead and live loads.
a) True
b) False
View Answer
Explanation: When DPC is not able to withstand the dead and live load then it leads to the crack formation in the DPC material due to overloading and the cracks starts to let the moisture in leading to dampness and so it must be able to withstand dead and live loads.
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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