Building Materials problems
- 1. Pick up the correct statement from the following:
Options- A. Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer
- B. Cupola furnace is used for the manufacture of cast iron
- C. Red short iron is of no value for welding purpose
- D. All the above. Discuss
Correct Answer: All the above.
- 2. The presence of sand in brick earth prevents:
Options- A. cracking of bricks
- B. shrinkage of bricks
- C. warping of bricks
- D. none of these. Discuss
Correct Answer: warping of bricks
- 3. Dolomite is a lime stone which contains carbonate of magnesia upto
Options- A. 15%
- B. 20%
- C. 25%
- D. 35%
- E. 45%. Discuss
Correct Answer: 45%.
- 4. The property by virtue of which lime sets under water, is known as
Options- A. slacking
- B. setting
- C. hydraulicity
- D. calcining. Discuss
Correct Answer: hydraulicity
- 5. If the ore impurities is
Options- A. clay, lime stone is used as flux
- B. lime stone, clay is used as flux
- C. quartz, lime stone and argallaceous iron ores are used as flux
- D. All the above. Discuss
Correct Answer: All the above.
- 6. The percentage of alumina and silica in good fire clay vary respectively is
Options- A. 25, 75
- B. 30, 70
- C. 35, 65
- D. All of these. Discuss
Correct Answer: 25, 75
- 7. Porcelain is used as :
Options- A. sanitary wares
- B. electric insulators
- C. storage vessels
- D. reactor chambers
- E. All of the above. Discuss
Correct Answer: reactor chambers
- 8. Pegmatite is a/an
Options- A. intrusive igneous rock
- B. extrusive igneous rock
- C. sedimentary rock
- D. metamorphic rock. Discuss
Correct Answer: intrusive igneous rock
- 9. To retard the initial setting time of cement, the compound responsible, is
Options- A. Tricalcium silicate
- B. Gypsum
- C. Di-calcium silicate
- D. Tri calcium aluminate. Discuss
Correct Answer: Gypsum
- 10. The most important constituent of an oil paint, is
Options- A. thinner
- B. vehicle
- C. pigment
- D. base
- E. all the above. Discuss
Correct Answer: all the above.
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