This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Terminology Used in Plastering Work – 1”.
1. The surface on which the first coat of plaster is applied is called as ___________
Explanation: Plastering is done in order to prevent the moisture from entering the external surfaces of buildings. It is also done to give a smooth and pleasing surface. The surface on which the first coat of plaster is applied is called background.
2. Development of swellings on the finished plastered surface is known as __________
Explanation: Development of swellings on the finished plastered surface is known as blistering. This is due to the presence of residual unslaked lime nodules. It is caused by the formation of bubbles under the film of paint.
3. Development of fissures in the plaster due to the movement of the background is known as _________
Explanation: Development of fissures in the plaster due to the movement of the background results in a phenomenon called cracking. Any kind of vibrations or movements in the surrounding structures can also cause cracking.
4. Development of hair cracks is known as __________
Explanation: Development of hair cracks in the plastered surface is known as crazing. The cracks are made usually in irregular patterns over the finished plastered surface.
5. Dado is the upper part of the plastered wall.
Explanation: The lower part of the plastered wall is dado. It is applied for a height of 3-7 feet especially in toilets, kitchens etc. to prevent water absorption and to make the walls smooth.
6. Small projections of plaster which are laid on background for fixing of screeds are known as ________
Explanation: Small projections of plaster that are laid on background for fixing of screeds are known as dots. The size of the dots is generally 15 cm x 15 cm.
7. ____________ is the process of filling the hollow spaces left in the solid background.
Explanation: Dubbing is the process of filling the hollow spaces left in the solid background. Dubbing is done before applying the main body of the plaster.
8. The final coat of plaster is known as ___________
b) Finishing coat
d) Plastered coat
Explanation: The final coat of the plaster applied to the walls and ceilings is called the finishing coat. This coat is also called skimming coat or setting coat. Painting cannot be done until the finishing coat is applied.
9. Scaling away patches of plaster of the previous coat is called as _________
Explanation: Scaling away patches of plaster of the previous coat is called flaking. It happens due to lack of adhesion with the coats of plaster applied under the finishing coat.
Explanation: The given figure represents a floating rule. It is a tool which is used in the plastering work. Various other tools used in the plastering work are a metal float, a wooden float, gauging tools etc.
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