Construction and Building Materials Multiple Choice Questions & Answers (MCQs) 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
Answer: b
Clarification: 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
Answer: a
Clarification: 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
Answer: d
Clarification: 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
Answer: c
Clarification: 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
Answer: d
Clarification: 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
Answer: b
Clarification: 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
Answer: b
Clarification: 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