Civil Engineering - Building Materials
Exercise :: Building Materials - Section 5
| 11. |
When a brick is immersed in water for 24 hours and then dried, if |
| A. |
no grey or white deposits appear on the surface, the brick is free from soluble salts | | B. |
10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence | | C. |
50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence | | D. |
All the above. |
Answer: Option D
Explanation:
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| 12. |
In arches, stratified stones are placed so that their planes are |
| A. |
parallel | | B. |
perpendicular | | C. |
radial | | D. |
none of these. |
Answer: Option C
Explanation:
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| 13. |
Pick up the correct statement from the following: |
| A. |
Acid test is done to find out the weathering quality of stones | | B. |
Attrition test is done to find out the rate of wear of stones which are used in road construction | | C. |
Crushing test is done to find out the compressive strength of the stone | | D. |
Impact test is done to determine toughness of a stone | | E. |
All the above. |
Answer: Option E
Explanation:
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| 14. |
The fire clay contains pure |
| A. |
lime | | B. |
oxide of iron | | C. |
hydrated aluminium silicate | | D. |
magnesium. |
Answer: Option C
Explanation:
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| 15. |
Pick up the correct characteristic of Pyroxene from the following: |
| A. |
It forms octagonal crystals | | B. |
It converts to chlorine by hydration | | C. |
Its density is 2.3 to 3.6 g/cm2 | | D. |
Its hardness is 5 to 6 | | E. |
All the above. |
Answer: Option E
Explanation:
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