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6 .
Ultimate strength to cement is provided by
| A. | Tricalcium silicate |
| B. | Di-calcium silicate |
| C. | Tri-calcium aluminate |
| D. | Tetra calcium alumino ferrite. |
7 .
Elastomers can extend upto
| A. | five times their original dimensions |
| B. | seven times their original dimensions |
| C. | ten times their original dimensions |
| D. | three times their original dimensions. |
8 .
Bitumen felt
| A. | is used as water proofing material |
| B. | is used as damp proofing material |
| C. | is made from bitumen and hessian fibres |
| D. | all the above. |
9 .
In the method of condensation polymerization,
| 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. |
10 .
In the cement the compound quickest to react with water, is
| A. | Tricalcium aluminate |
| B. | Tetra-calcium alumino-ferrite |
| C. | Tricalcium silicate |
| D. | Dicalcium silicate. |
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