This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Effects of Dampness”.
1. Which of the following is the effect of rising dampness?
a) Condensation
b) Rising dampness
c) Patches on wall
d) Crack formation
View Answer
Explanation: The salt that are present in the ground water are transported up the wall by capillary action and when the moisture evaporates then the salts are left behind on the wall leaving salty marks on the wall.
2. The band of salts that are present in the wall due to rising dampness are found at the maximum height of the dampness.
a) True
b) False
View Answer
Explanation: As the water rises through capillary action they try to reach the maximum height possible and after that the moisture starts to evaporate leaving behind the bands of salts in that maximum height.
3. Which of the following is the social effect of dampness?
a) Increases health risks
b) Encourages mould growth
c) Encourages dust mites
d) Devalues property
View Answer
Explanation: The main social effect of dampness is, it devaluates the value of the structure and so when it to be sold then the value of the structure goes down thereby leading to loss.
4. Which of the following is the physical effect of dampness?
a) Reduces comfort levels
b) Increases occupants level of distress
c) Encourages insomnia
d) Increases health risks
View Answer
Explanation: When a building is affected by dampness then that damp atmosphere encourages the growth of insects and moulds which results in allergic reaction thereby causing increased health risk to the occupants.
5. The extent of moisture action in case of damage unlikely causes severe effects on the structure.
a) True
b) False
View Answer
Explanation: In case of unlikely damage condition, the extent of moisture penetration into the building doesn’t cause any adverse effect on the building even when the damage is extended over a long period of time.
6. The removal of the source of dampness comes under which of the following cases of damage to the material?
a) Damage unlikely
b) Action required
c) No action acquired
d) Damage likely
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.
7. The permanent damage to the structure comes under which of the following cases of damage to the material??
a) Damage unlikely
b) Action required
c) No action acquired
d) Damage likely
View Answer
Explanation: In the case of damage likely, the materials are subjected to adverse moisture leading to permanent damage to the building which could not be rectified by any means.
8. Effect of the low moisture in timber causes _______ straining.
a) dispersed
b) localized
c) permanent
d) temporary
View Answer
Explanation: When the timber is affected by low moisture content it causes localized straining where the straining occurs only in the moisture penetrated area and the remaining areas are free of the straining.
9. Effect of high moisture content causes deterioration of timber.
a) True
b) False
View Answer
Explanation: When the timber if affected by high moisture content the severity of the dampness increases to a greater extent which leads to the formation of moulds and insects and later this causes complete deterioration of the timber.
10. Efflorescence from salts occurs in _________
a) bricks
b) steel
c) floor
d) ceiling
View Answer
Explanation: When the bricks are affected by moisture then the salts remaining in the water penetrated results in the formation of efflorescence.
11. When clay brick and concrete blocks are affected by high moisture content then it results in _________ straining.
a) dispersed
b) localized
c) widespread
d) temporary
View Answer
Explanation: When the moisture content of the clay bricks and concrete blocks are highly increased then the mould growth in them causes widespread straining causing extreme damage to the material.
12. Frost action mainly occurs in gypsum finishes due to the effect of high moisture content.
a) True
b) False
View Answer
Explanation: When the gypsum finishers are affected by high moisture content then the frost action leads to the formation of catastrophic failure.
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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