| 1. | The burning of bricks ? | |
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12
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24
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48
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96
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Report Question| 2. | The central part of a tree is called ? | |
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heart wood
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pith
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sap wood
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cambium lay
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| 3. | Excess of silica in the clay ? | |
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makes the brick brittle and weak
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makes the brick crack and wrap on drying
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changes the colour of the brick from red to yellow
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improves impermeability and durability of the brick
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| 4. | The base in a paint is added to ? | |
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improve the quality of paint
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make smooth surface
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hide the surface to be painted
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all of these
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| 5. | The solvent used in cement paints ? | |
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thinner
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turpentine
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water
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spirit
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| 6. | The final setting time of ordinary cement should not be more than ? | |
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2 hours
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4 hours
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8 hours
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10 hours
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| 7. | The sedimentary rocks are formed due to ? | |
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solidification of molten mass lying below or above the earth surface
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gradual deposition of materials like sand, clay, etc., generally by setting water
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alteration of original structure under heat and excessive pressure
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none of the above
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| 8. | For railway ballast, the stone should be ? | |
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soft with a uniform texture
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hard, heavy, strong and durable
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hard, tough, resistant to abrasion and durable
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hard, dense, durable, tough and easily workable
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| 9. | The percentage of silica in a good brick clay should vary from ? | |
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20 to 30%
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30 to 40%
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40 to 50%
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50 to 60%
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| 10. | The dressing of stone is done ? | |
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immediately after quarrying
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after seasoning
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after three months of quarrying
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just before building
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