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Building Materials - Section 3 Multiple Questions and Answers.
| 46. | Dry rot | ||
| A. | cracks the timber | ||
| B. | reduces the strength of timber | ||
| C. | reduces the timber to powder | ||
| D. | shrinks the timber | ||
| 47. | Which one of the following polymers is obtained from condensation polymerization? | ||
| A. | phenol formaldehyde | ||
| B. | carbamide | ||
| C. | melamine-formaldehyde | ||
| D. | all of these. | ||
| 48. | The weight of 1 m3 of brick earth, is about | ||
| A. | 1200 kg | ||
| B. | 1500 kg | ||
| C. | 1800 kg | ||
| D. | 2000 kg. | ||
| 49. | Pozzolana (or surkhi) is used in lime | ||
| A. | to impart hydraulicity | ||
| B. | to prevent shrinkage | ||
| C. | to decrease the cost of construction | ||
| D. | to decrease the setting time. | ||
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