Civil Engineering - Building Materials
Exercise :: Building Materials - Section 7
16. |
The percentage of alumina and silica in good fire clay vary respectively is |
A. |
25, 75 | B. |
30, 70 | C. |
35, 65 | D. |
All of these. |
Answer: Option A
Explanation:
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17. |
The term frog means |
A. |
an apparatus to lift the stone | B. |
a depression on a face of brick | C. |
vertical joint in a brick work | D. |
soaking brick in water. |
Answer: Option B
Explanation:
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18. |
Asphalt is obtained from |
A. |
petroleum distillation | B. |
bitumen distillation | C. |
plastic distillation | D. |
none of these. |
Answer: Option A
Explanation:
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19. |
To retard the initial setting time of cement, the compound responsible, is |
A. |
Tricalcium silicate | B. |
Gypsum | C. |
Di-calcium silicate | D. |
Tri calcium aluminate. |
Answer: Option B
Explanation:
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20. |
Dorry's testing machine is used for |
A. |
crushing test of stone | B. |
hardness test of stone | C. |
impact test of stone | D. |
water absorption test. |
Answer: Option B
Explanation:
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