This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Miscellaneous Materials – 1”.
1. The substance which is used for removing the excess material by means of cutting is called ____________
Explanation: The substance which is used for removing the excess material by means of cutting is called an abrasive. They are the hardest materials. They are used to polish soft materials and provide them with an attractive appearance.
2. Which of the following is not a natural abrasive?
Explanation: Abrasives are broadly classified into two categories – natural and artificial abrasives. Natural abrasives are those which occur in nature. Garnet, diamond and flint are examples of natural abrasives while silicon is an artificial abrasive.
3. Which of the following is not a synthetic abrasive?
a) Carbides of aluminium
b) Boric acid
Explanation: Synthetic abrasives or artificial abrasives can be prepared of desired quality and their manufacturing allows the exact duplication of the product. Examples of synthetic abrasives are carbides of aluminium, silicon, boric acid etc. Corundum is an example of a natural abrasive.
4. Which of the following is not a synthetic resin?
a) Melamine resins
b) Urea resins
c) Animal protein glue
d) Phenolic resins
Explanation: There are mainly four types of synthetic resins. These are melamine resins, urea resins, phenolic resins and resorcinol resins. Melamine resins are used in the manufacturing of plywood and phenolic resins are used in the manufacturing of resin-bonded plywood.
5. The thermo-plastic glues are permanent once they are set.
Explanation: Glues from synthetic resins can be either thermo-plastic glues or thermo-setting glues. The thermo-plastic glues, on reheating, can be made plastic again while the thermo-setting glues are permanent once they are set.
6. Nitrocellulose glues are prepared from _________
a) Natural gum
Explanation: Nitrocellulose glues are prepared from pyroxilin. pyroxilin is nitrated cellulose which is derived by the treatment of cellulose with nitric acid.
7. Rubber glues are obtained by dissolving rubber in _________
Explanation: Rubber glues are obtained by dissolving rubber in benzene. They are extensively used for joining rubber, glass, plastics, etc.
8. Which of the following is also known as residual asphalt?
a) Lake asphalt
b) Natural asphalt
c) Rock asphalt
d) Artificial asphalt
Explanation: Asphalt is divided into two categories – natural and residual asphalt. Natural asphalt is obtained from nature. Residual asphalt is also known as artificial asphalt.
9. We can obtain lake asphalt from lakes at _________
a) Bermudez and Trinidad
b) Argentina and Brazil
c) Chile and Colombia
d) Ecuador and Mexico
Explanation: Natural asphalt is divided into two groups – lake asphalt and rock asphalt. We can obtain lake asphalt from lakes at Bermudez and Trinidad at depths which vary from 3-60 m.
10. Which of the following is not a property of asphalt?
a) Asphalt is a good insulator of heat and electricity
b) Asphalt is waterproof material
c) Asphalt is inflammable
d) Asphalt is not attacked by acids
Explanation: Asphalt is a good insulator of heat and electricity. Asphalt is waterproof material and non-inflammable. Asphalt is not attacked by acids.
11. Tensile strength of leather belts should be about _______
a) 75 kg/cm2
b) 175 kg/cm2
c) 275 kg/cm2
d) 375 kg/cm2
Explanation: Tensile strength of leather belts should be about 175 kg/cm2. Belts are used for driving machinery, for running mechanical conveyors or for transmitting power.
12. Tensile strength of rubber belts is about _______
a) 100 kg/cm2
b) 300 kg/cm2
c) 400 kg/cm2
d) 1000 kg/cm2
Explanation: Tensile strength of rubber belts is about 400 kg/cm2. Rubber belts are reinforced with jute, cotton, canvas etc. Rubber belts are quite cheap and have a better grip on pulleys.
13. The binding material present in asphalt is __________
Explanation: The binding material present in asphalt is bitumen. It is also called mineral tar and is obtained by partial distillation of crude petroleum.
14. The amount of inert filler in plastic bitumen is about _________
Explanation: Plastic bitumen consists of bitumen, a suitable inert filler and a thinner. The amount of inert filler in plastic bitumen is about 40-45%. Plastic bitumen is used to fill cracks in masonry structures.
15. Which of the following is not true about cork?
a) It is obtained from the bark of cork oak trees
b) Cork is a good conductor of sound and electricity
c) Cork is porous
d) Cork is not attacked by heat and moisture
Explanation: Cork is porous and is a good insulator of sound and electricity. It is obtained from the bark of cork oak trees and is not attacked by heat and moisture.
Sanfoundry Global Education & Learning Series – Building Construction.
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