1. When damp proofing treatment is given to floors then ________ mm thick layer of coarse sand is completely spread over the entire floor area of the building.
a) 100 to 150
b) 200 to 250
c) 75 to 100
d) 250 to 300
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Explanation: When damp proofing treatment is given to floors then 75 to 100 mm thick layer of coarse sand is completely spread over the entire floor area of the building where the soil water table is low so as to form a prime layer to the damp proofing treatment and is called as the base course.
2. Above the base course, a layer of ____________ is laid to a depth of 100 mm.
a) lime cement concrete
b) plain cement concrete
c) water proof cement
d) lean cement concrete
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Explanation: A layer of lean cement concrete in the ratio 1:3:6 or 1:4:8 is laid above the base course to a depth of 100 mm thereby forming a base layer for the floor topping such as tiles and cement concrete.
3. Walls get damp due to ________ of bricks and mortar joints.
a) strength
b) porosity
c) voids
d) soundness
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Explanation: Walls get affected by dampness that reaches them by the penetration of water from the external surface to the internal surface through the porosity of the bricks and mortar joints. The pores that are present in the bricks act as a path way for the moisture to reach the building thereby leading to dampness.
4. When damp proofing treatment is given to walls plastering is done in the proportion of ________ mix ratio.
a) 1:1.5:3
b) 1:1:5
c) 1:1:6
d) 1:5:10
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Explanation: When damp proofing treatment is given to walls plastering is done in the proportion of 1:1:6 mix ratio which contains one part of cement, one part of lime and six part of sand and this ratio serves as the best proportion for all weather conditions.
5. When damp proofing treatment is given to walls in the areas of heavy rainfall cement plaster is applied to by mixing it with water proofing compounds like ________
a) Pudlo
b) Acrylic resin
c) Polyurethane resin
d) Plast-O-Proof
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Explanation: When damp proofing treatment is given to walls in the areas of heavy rainfall cement plaster is applied to by mixing it with water proofing compounds like pudlo which has the best water resistance capacity.
6. In the internal wet areas like toilet which of the following water proofing method is adopted?
a) Bituminous membrane
b) Liquid water membrane proofing
c) Cementitious water proofing
d) Bituminous coating
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Explanation: Since the internal areas like toilets are not exposed to sunlight and weathering cementitious water proofing is adopted which doesn’t undergo contraction and expansion.
7. Liquid water membrane proofing is more flexible than cementitious water proofing.
a) True
b) False
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Explanation: Since polymer materials are used for coating, they have more elongation property to a range of about 280% and so liquid water membrane proofing is more flexible than cementitious water proofing.
8. Bituminous coating is not suitable for areas that are exposed to sunlight.
a) True
b) False
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Explanation: Bituminous coating is not suitable for areas that are exposed to sunlight because they become brittle when that exposed to sunlight for long term and to overcome this defect they are modified with flexible material like polyurethane.
9. Which of the following is not a self-adhesive component used in water proofing treatment?
a) Asphalt
b) Polymers
c) Fillers
d) Polyurethane
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Explanation: Polyurethane is not a self-adhesive component because it has larger shelf life and also it is a flexible material used for water proofing treatment.
10. Which of the following water proofing method is more expensive?
a) Bituminous membrane
b) Liquid water membrane proofing
c) Cementitious water proofing
d) Polyurethane liquid water membrane proofing
View Answer
Explanation: Polyurethane liquid water membrane proofing is more expensive when compared to all other water proofing methods and they are used for treating flat roofs.
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