Here are Repair and Rehabilitation of Structures MCQs (Chapterwise).
1. What is the primary purpose of structural repair and rehabilitation?
a) Restoration of strength and durability
b) Reduction in construction time
c) Aesthetic enhancement
d) Increase in initial cost
View Answer
Explanation: Structural repair and rehabilitation aim to restore the strength and durability of a structure, addressing any deterioration or damage it may have suffered over time.
2. Which type of cracks indicates the development of tension in concrete?
a) Medium cracks
b) Isolation crack
c) D-cracking
d) Crazing
View Answer
Explanation: Isolation crack indicates the tension on concrete and the tension development is usually perpendicular to the cracks. Sometimes these cracks can also run in a diagonal, longitudinal, transverse, and vertical or in horizontal direction.
3. What component of the building undergoes elastic deformation?
a) Super structure
b) Sub-structure
c) Foundation
d) Structural elements
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Explanation: Dead and super imposed live loads in the structural components of the building leads to elastic deformation in accordance with hook law. The amount of deformation also depends upon other factors like elastic modulus, magnitude of loading and the dimension of the component.
4. Which of the following is not a measure for the prevention of cracks?
a) Aggregate with low coefficient of thermal expansion
b) Choice of material
c) Design of building
d) Construction techniques and practices
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Explanation: Aggregate with a low coefficient of thermal expansion is a prevention method for reducing the thermal stress developed in concrete and remaining are the preventive measure for crack prevention in buildings.
5. Which of the following factors affect the architectural design of the building?
a) Provision of movement joints
b) Provision of slip joints
c) Large span of rooms
d) Filling of plinth
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Explanation: Large span of rooms is one of the major factors that affect the architectural design of the building and remaining are the factors of construction practices and techniques.
6. Which of the following device is used when accurate readings of the cracks are desired?
a) Strain gauges
b) Telltales
c) Vernier caliper
d) Extensometer
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Explanation: When accurate reading about the cracks is needed the extensometer is used because they give accurate reading about the dimensions of the crack when compared with other devices and also they provide stress strain measurements of the cracks.
7. Which of these are the external sources of dampness?
a) Precipitation
b) Condensation
c) Leaking services
d) Construction moisture
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Explanation: Naturally occurring rain and snow are the principal moisture sources which result in the penetration of water into the building and so it is the external sources of dampness. Remaining sources are internal sources of building.
8. The removal of the source of dampness comes under which of the following cases of damage to the material?
a) Damage likely
b) No action acquired
c) Action required
d) Damage unlikely
View Answer
Explanation: In action required cases of damage the source of dampness is removed to avoid further penetration of water into the building. And this is done by providing ventilation to the material affected by dampness.
9. Which of the following thickness is commonly adopted for laying DPC?
a) 12 mm
b) 25 mm
c) 15 mm
d) 30 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.
10. 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 foundation drains and DPC
b) Usage of Ferro cement
c) Usage of asphalt
d) Usage of bituminous felts
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.
11. Which of the following is not adopted as a damp proofing treatment for flat roofs?
a) Grading of mud phuska with tiles
b) Grading of lime phuska with tiles
c) Grading of lime concrete
d) Providing RCC floors and wall slabs
View Answer
Explanation: Providing RCC floors and wall slabs are considered as damp proofing treatment to the basement in damp soil and remaining are the damp proofing treatment for flat roofs that are adopted in various regions of the country.
12. Which of the following is the normal defect that is looked during the visual inspection?
a) Corrosion of rebars
b) Cover details
c) Honeycomb
d) Joints formation
View Answer
Explanation: Honeycomb is the normal defect that is looked during the visual inspection because they tend to reduce the strength of the concrete structures to a greater extent and also, they are easily visible to the naked eye and do not require any techniques to identify them.
13. Which of the following can provide protection against mild acid exposure?
a) High water cement ratio
b) Low water cement ratio
c) High slump
d) Low slump
View Answer
Explanation: Low water cement ratio can prevent a mild acid attack on concrete because in that case, the concrete becomes dense leading to less effects of acid on them which could be further rectified.
14. What component of the building undergoes sulphate attack?
a) Super structure
b) Sub-structure
c) Foundation
d) Structural elements
View Answer
Explanation: Concrete and masonry in foundation and plinth and masonry and plaster in super structure are more liable to sulphate attack. The sulphate attack on these building components will result in weakening of their structural strength and in course of time it leads to unequal settlement of the foundation.
Chapterwise Multiple Choice Questions on Repair and Rehabilitation of Structures
1. MCQ on Building Cracks
The section contains multiple choice questions and answers on building cracks, their principal causes, preventive measures, common patterns, repair techniques, and the provision of movement joints in structures.
2. Moisture Penetration
The section covers questions and answers on sources of dampness, effects of dampness, materials for damp-proof courses, and damp-proofing treatment in buildings, including a specific focus on treatment for roofs and parapet walls.
3. Concrete Structures
The section contains MCQs on concrete structures, evaluation of concrete in these structures, causes of distress and deterioration of concrete, and the planning and design of concrete repair.
Wish you the best in your endeavor to learn and master Repair and Rehabilitation of Structures!
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