This set of Construction and Building Materials Multiple Choice Questions & Answers (MCQs) focuses on “Defects in Plastering”.
1. The plan expanded ________________ is most commonly used and it is under patent names are available in the market.
a) Wooden lath
b) Metal lath
c) Latex lath
d) Rubber lath
View Answer
Explanation: Metal lath is prepared from sheets of mild steel which are machine cut and drawn out or expanded. A diamond mesh appearance is thus formed throughout the whole area of the sheet. The hybrid which is steel lath can also be used for this purpose.
2. The _________________ are supported and fixed with 9 mm to 12 mm diameter Steel rods or steel channels.
a) Metal laths
b) Wooden laths
c) Rubber laths
d) Latex laths
View Answer
Explanation: The metal laths provided a better fire resistance construction in form of firm and solid foundation for plaster work. The various types of metal laths under patent names are available in the market. The ribs in the metal lath renders stiffness to the Steel sheet.
3. The ____________________ are the strips of wood used for plastering purpose which are selected from well seasoned wood.
a) Metal laths
b) Latex laths
c) Rubber laths
d) Wooden laths
View Answer
Explanation: In wooden lath, the strips are generally 25 mm wide and 1 m to 1.20 m long. The length of strips are adjusted to suit the spacing of timber joists. According to thickness, the wooden strips are classified into three categories.
4. The _________________ are not useful for fire resistant construction.
a) Rubber laths
b) Latex laths
c) Wooden laths
d) Metal laths
View Answer
Explanation: Wooden laths are also likely to be attacked and damaged by the white and fungi. The thicker strips are useful for ceilings where Strain is more and thinner strips are used for walls and partitions where strain is comparatively less.
5. _________________ is the Plastering defect which is particularly seen in case of plastered surfaces inside the building.
a) Softness
b) Cracks
c) Peeling
d) Blistering
View Answer
Explanation: Blistering of plastered surface is seen in the small patches swell out beyond the plane of the Plastered surface and also it is seen in particularly in case of plastered surfaces inside the building.
6. The development of fine hair cracks is known as ____________
a) Popping
b) Crazing
c) Flaking
d) Efflorescence
View Answer
Explanation: Cracks are formed on the Plastered surface and may be hair cracks or cracks which may be easily seen.
7. The presence of soluble salts in the Plaster making material as well as building materials is due to _________________
a) Flaking
b) Efflorescence
c) Peeling
d) Popping
View Answer
Explanation: Due to Efflorescence, the soluble salts are present in plaster making materials as well as building material such as bricks, sand, cement, etc. Even Water used in the construction work may contain soluble salt. When a newly constructed wall dries out, the soluble salts are brought to the surface and they appear in the form of white is a crystalline substance.
8. The formation of very small lose mass on the Plastered surface is known as the _____________
a) Peeling
b) Flaking
c) Popping
d) Uneven surface
View Answer
Explanation: The Flaking is mainly due to Bond failure between successive coats of plaster. Uneven surfaces becomes prominent only due to poor workmanship of the work.
9. The Plaster from some portion of the surface comes off and forming a patch is due to ________
a) Popping
b) Flaking
c) Peeling
d) Softness
View Answer
Explanation: The plaster from some portion of the surfaces comes off and a patch is formed. Such formation is termed as the Peeling and it is also mainly due to Bond failure between successive coats of plaster.
10. A conical hole in plastered surface is formed due to ___________
a) Popping
b) Rust stains
c) Softness
d) Uneven surface
View Answer
Explanation: Sometimes the Plaster mix contains particles with expand on being set. A conical hole in plastered surface is formed in front of the particle. This conical whole is known as the blow or pop.
11. The excessive dampness at certain points on the Plastered surface due to ___________
a) Uneven surface
b) Softness
c) Rust stains
d) Popping
View Answer
Explanation: The chief reason of such softness are due to thickness of the finishing coat, presence of deliquescent salts, excessive suction of the undercoat, etc. Hence, this leads to excessive dampness at certain points on the plastered surface makes that portion Soft.
12. _________________ are sometimes seen on the plastered surface, especially when the Plaster is applied on the metal lath.
a) Rust stains
b) Uneven surface
c) Popping
d) Peeling
View Answer
Explanation: Whereas, the uneven surface becomes prominent only due to poor workmanship of the work. To minimize the defects in plastering works, some remedies should be undertaken such as the bond of bricks should be properly maintained, etc.
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