This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “General Measures for Prevention of Cracks – Set 2”.
1. Which of the following factors affect the architectural design of the building?
a) Provision of slip joints
b) Provision of movement joints
c) Filling of plinth
d) Large span of rooms
View Answer
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.
2. Bearing pressure on the soil should be uniform to avoid differential settlement.
a) True
b) False
View Answer
Explanation: Foundation should always be designed such that the bearing pressure on soil should be uniform to avoid differential settlement because when differential settlement occurs it leads to the formation of cracks in the foundation.
3. Filling the plinth is done with soil free from organic matter, brick bats and other debris to a depth of ______ cms.
a) 15
b) 30
c) 25
d) 20
View Answer
Explanation: Filling the plinth is usually done to a depth of 25 cms and must be compacted to the chances of subsequent subsidence and also to prevent tracking of floors. Other depths are not adopted since they are not always economical.
4. Difference in the height of the masonry level in different parts of the building should not exceed ____ during construction.
a) 2m
b) 1m
c) 1.5m
d) 2.5m
View Answer
Explanation: The difference in the height of masonry walls on different parts of the building are usually not allowed to exceed 1m to avoid the differential loading on the building parts which leads to differential settlement of foundation and this also leads to the formation of cracks.
5. __________ joints are adopted in concrete and terrazzo flooring.
a) Control joint
b) Slip joint
c) Expansion joint
d) Movement joints
View Answer
Explanation: Control joints are normally preferred in concrete and terrazzo flooring and are provided either by laying floors in alternate layers or by providing a strip of glass or other material in order to avoid the contraction and expansion of the floor during seasonal variation. Once the contraction and expansion is prevented the formation of cracks can also be arrested.
6. Wall and ceiling plaster is always made discontinuous by a groove of ____________
a) 7mm
b) 4mm
c) 15mm
d) 10mm
View Answer
Explanation: Normally a groove is cut between wall and ceiling plaster and is of size 10mm.The groove is cut in order to avoid the penetration of moisture from ceiling plaster to wall plaster or vice versa and this in turn prevents the formation of cracks.
7. Finishing items on the walls are applied after the plaster has undergone ________ shrinkage.
a) drying
b) plastic
c) elastic
d) initial
View Answer
Explanation: When the finishing items such as distemper and paints are applied on the walls before the plaster has undergone drying shrinkage if not the moisture present in the finishers will accelerate the moisture penetration into the surface leading to the formation of cracks.
8. The reinforcement in the RCC works in exposed condition shall be increased by ______ of the minimum amount prescribed.
a) 45%
b) 20%
c) 50%
d) 70%
View Answer
Explanation: In RRC works such as sunshades, balconies and canopies that are exposed to external condition the quantity of the reinforcement can be increased by 50% in order to arrest the formation of shrinkage and contraction cracks.
9. The plaster works should be properly cured and allowed to dry before applying the finishing coat.
a) True
b) False
View Answer
Explanation: In order to seal the cracks that are present in the plaster, the finishing coat is always applied after the plaster is allowed to properly dry and cure. After proper curing, the plaster will have completely undergone drying shrinkage.
10. It is desirable to do concreting when the ambient temperature is high.
a) True
b) False
View Answer
Explanation: When concreting is done in hot weather, the rate of shrinkage is greater in the concrete leading to the formation of shrinkage cracks and so concreting is avoided when the ambient temperature is high.
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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