This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Damp Proofing Treatment in Building-1”.
1. In case of buildings without plinth the DPC is provided at _________ mm above ground level.
a) 100
b) 200
c) 150
d) 250
View Answer
Explanation: When the DPC is laid at ground level then the materials that get accumulated in the surrounding will rise above the DPC and in that cases, the moisture starts penetrating into the brick work and so the DPC should be provided at 150mm above the ground level.
2. When buildings are constructed on damp soil in wet areas then both the walls and ground floor are subjected to dampness.
a) True
b) False
View Answer
Explanation: In case of the buildings that are constructed in damp soil in wet areas, due to rapid capillary action of the pores the moisture present in the soil have the tendency to rise up even to the ground floor and in those cases the DPC is laid over the entire area of the building including wall thickness.
3. When bitumen felts are used for damp proofing treatment then in the primer coat it is laid at a rate of _________ kg/m2.
a) 2.5
b) 1.5
c) 0.5
d) 3
View Answer
Explanation: When bitumen felts are used for damp proofing treatment, the prime coat is laid at a rate of 1.5 kg/m2 by using the hot bitumen which is followed by a single coat of bitumen and then at the end it is given a finishing coat.
4. After laying the bitumen felts they are immediately covered by layer of bricks.
a) True
b) False
View Answer
Explanation: After laying the bitumen felts they are immediately covered by a layer of bricks which is laid on the layer of fine sand and laying this prevents the damage to the felts due to the droppage of any sharp objects in the site.
5. In case of buildings that are built on the places where the subsoil water table is low vertical DPC is provided on the ____________ face of the basement walls.
a) internal
b) external
c) header
d) stretcher
View Answer
Explanation: In case of buildings that are built on the places where the subsoil water table is low then the hydrostatic pressure is not developed much and so vertical DPC is provided on the external face of the basement walls which acts as a water proof tank thereby keeping the walls dry.
6. Commonly bituminous felts are used in multiple layers when damp proofing treatment is given to the basements.
a) True
b) False
View Answer
Explanation: When damp proofing treatment is to be given to the basements where the water table is very nearer and the chances of water penetration are larger, then the bituminous felts are used in multiple layers to avoid the penetration of moisture thereby avoiding dampness.
7. When vertical DPC is laid the groove is made and is filled with cement mortar of mix ratio _______
a) 1:4
b) 1:8
c) 1:6
d) 1:10
View Answer
Explanation: The groove made during the installation of vertical DPC is filled with the cement mortar of mix ratio 1:4 and also the DPC is protected so that it doesn’t get punctured by the roots of the tress or it is damaged by the slats that are present in the soil.
8. Which of the following methods is adopted when the treatment is to be given for the basement which is built in damp soil?
a) Usage of bituminous felts
b) Usage of asphalt
c) Usage of Ferro cement
d) Usage of foundation drains and DPC
View Answer
Explanation: When the basement is built in damp soil where the water table is very high and the ground water produces hydrostatic pressure, the foundation drains are provided in the basement in addition to the DPC material so that excess moisture doesn’t get inside the building.
9. When the treatment is to be given for the basement which is built in damp soil using the cement mortar _________ based chemicals are used along with rough stone slabs.
a) Acrylic
b) Ethylene
c) Alcoholic
d) Fiber
View Answer
Explanation: When the treatment is to be given for the basement which is built in damp soil using the cement mortar then the acrylic based chemicals are used along with rough stone slabs because the acrylic based chemicals have good water proofing properties when compared to other composition.
10. Providing RCC floors and wall slab are adopted for the basements that are built in _______soil.
a) moist
b) sandy
c) damp
d) alluvial
View Answer
Explanation: When the basements are built-in damp soil then the moisture penetration is larger and so RCC floors and wall slabs are adopted to avoid the dampness into the building.
11. When vertical DPC is used the groove is cut to the depth of ______ mm.
a) 78
b) 65
c) 100
d) 55
View Answer
Explanation: When vertical DPC is laid continuous with the horizontal PDC the place where it is tucked is turned into the groove of depth 65 mm which is made in the external for the purpose of better anchorage.
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.
