Building Materials problems
- 1. Due to attack of dry rot, the timber
Options- A. cracks
- B. shrinks
- C. reduces to powder
- D. none of these. Discuss
Correct Answer: reduces to powder
- 2. Elastomers can extend upto
Options- A. five times their original dimensions
- B. seven times their original dimensions
- C. ten times their original dimensions
- D. three times their original dimensions. Discuss
Correct Answer: ten times their original dimensions
- 3. In the method of condensation polymerization,
Options- A. low-molecular substances are removed from the high molecular substance
- B. the reaction proceeds with an evolution of ammonia
- C. the reaction proceeds with an evolution of hydrogen chloride
- D. all the above. Discuss
Correct Answer: all the above.
- 4. Asbestos cement
Options- A. is brittle
- B. warps due to changes in humidity
- C. strength is lowered when saturated by water
- D. all the above. Discuss
Correct Answer: all the above.
- 5. Depending on the chemical composition and mechanical properties, iron may be classified as
Options- A. cast iron
- B. wrought iron
- C. steel
- D. all the above. Discuss
Correct Answer: all the above.
- 6. Pick up the hypabyssal rock from the following:
Options- A. Granite
- B. Dolerite
- C. Basalt
- D. All the above. Discuss
Correct Answer: Dolerite
- 7. The variety of pig iron used for manufacture of wrought iron, is
Options- A. Bessemer pig
- B. Grey or foundry pig
- C. White forge pig
- D. Mottled pig. Discuss
Correct Answer: White forge pig
- 8. Fibre glass
Options- A. retains heat-longer
- B. has a higher strength to weight ratio
- C. is shock proof and fire retardent
- D. does not decay
- E. all the above. Discuss
Correct Answer: all the above.
- 9. Brittleness of cold is due to an excess of
Options- A. sulphur
- B. carbon
- C. phosphorus
- D. silicon. Discuss
Correct Answer: phosphorus
- 10. The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as
Options- A. Cementation process
- B. Crucible process
- C. Bessemer process
- D. Open hearth process. Discuss
Correct Answer: Crucible process
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