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Basic Civil Engineering Multiple Choice Questions on “Plastering”.
1. Plastering is also called:
a) Pre-casting
b) Pargeting
c) Porting
d) Polishing
Answer: b
Clarification: Pargeting is decorative or water proof plastering that is applied on the walls.
2. __________ is used to ensure that the thickness of plastering is uniform.
a) Bull point
b) Pivot point
c) Bull mark
d) Bench mark
Answer: c
Clarification: It is provided at a specific distance to make sure that the required thickness of plastering is even throughout. It is a small rectangular or hexagonal mark.
3. Before plastering, the surface has to be:
a) Rough
b) Smooth
c) Cemented
d) Watered
Answer: a
Clarification: All the mortar joints and the brick surface has to be slightly scraped so as to obtain a rough surface. Plastering will be able to bond better on to a rough surface.
4. Which IS code gives specifications about cement plaster?
a) IS 1500
b) IS 1221
c) IS 1400
d) IS 1661
Answer: d
Clarification: IS code 1661 deals with the code of practice for the application of cement and cement-lime plastering on buildings.
5. Which of the below is not a plaster type based on the material?
a) Cement
b) Gypsum
c) Pozzolana
d) Lime
Answer: c
Clarification: Plastering requires a binding material and aggregates. The binding material is cementitious-cement, lime and gypsum. Pozzolana are siliceous compounds and possess no cementitious nature as such. When mixed with water, they can act as a cementitious material. But are generally not used in plastering.
6. In plastering, the 1st coat is called ___________ and its thickness should be _______ mm.
a) Undercoat, 6-9
b) Floating coat, 6-9
c) Floating coat, 10-15
d) Undercoat, 10-15
Answer: d
Clarification: Plastering can either be done in single, 2 or 3 coats. The 1st coat is undercoat of thickness of 10-15mm. 2nd coat is floating coat of 6-9mm thickness. The last coat is the finishing coat of 2-3mm thickness.
7. ___________ are used to press mortar and spread it uniformly.
a) Trowel
b) Aluminium rod
c) Floats
d) Brush
Answer: c
Clarification: Trowel is used for gauging and applying mortar to surface. Aluminium rod is used to strike off excess mortar. Brush is used to clean it.
8. Wood surface requires _________ coats of plastering.
a) 2
b) 3
c) 1
d) None
Answer: b
Clarification: Wood and metal surface require 3 coats of plastering so that the surface is completely safe and sealed. Stone and brick masonry generally require 2 coats and a single coat is done for low cost construction.
9. In a lime-cement plaster, ratio 1:1:6 corresponds to:
a) Lime:cement:sand
b) Cement:Lime:sand
c) Lime:sand:gravel
d) Cement:sand:gravel
Answer: b
Clarification: In plastering, a binding material and fine aggregate are used. Since in lime-cement plaster, 2 binding materials are present, a ratio of both material and sand is taken.
10. Which of the below is not a plaster finish?
a) Rough-cast
b) Pebble dash
c) Sand faced
d) Wooden
Answer: d
Clarification: There is no wooden plaster finish available. Rough-cast is provided to the external surface using 1:1:3 mortar (cement:sand:coarse aggregates). Pebble or flint dash finish involves embedding 10-20mm sized pebbles or flints in 12mm thick plaster. Sand faced finish is provided with 1:1 mortar.
11. Mud plastering does not require curing.
a) True
b) False
Answer: a
Clarification: In mud plastering, after 2 coats of plastering, a wash of earth, cow dung and cement in 3:2:1 proportion is done. It does not require curing, but should be allowed to dry in shade for 3-4 days.