| 1. | The test conducted in the laboratory on the specimen made out of trial ? | |
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preliminary test
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slump test
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works test
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none of these
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Report Question| 2. | The sum of percentages of all deleterious materials in the aggregate shall not exceed ? | |
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5%
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10%
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15%
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20%
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| 3. | The maximum particle size of coarse aggregate is ? | |
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45 mm
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55 mm
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65 mm
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75 mm
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| 4. | Vicat's apparatus is used to perform ? | |
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fineness test
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soundness test
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consistency test
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compressive strength test
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| 5. | The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds ? | |
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0.5 N/mm²
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1 N/mm²
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1.5 N/mm²
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2 N/mm²
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| 6. | The object of curing is to ? | |
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prevent the loss of water by evaporation
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reduce the shrinkage of concrete
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preserve the properties of concrete
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all of these
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| 7. | For batching 1: 2: 4 concrete mix by volume, the ingredients required per bag of cement are ? | |
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50 kg of cement: 70 kg of fine aggregate: 140 kg of coarse aggregate
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50 kg of cement : 70 litres of fine aggregate: 140 litres of coarse aggregate
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50 kg of cement: 100 kg of fine aggregate: 200 kg of coarse aggregate
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50 kg of cement: 100 litres of fine aggregate: 140 litres of coarse aggregate
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| 8. | In voids method of determining the quantity of cement paste, it is assumed ? | |
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voids in the coarse aggregate are filled by the fine aggregates
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volume of fine aggregates required for 1 m' of coarse aggregate is equal to total voids in coarse aggregate plus 10% aggregate extra to allow for additional voids created by wedging action
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volume of cement paste required for 1 m' of coarse aggregate is equal to total volume of voids in the fine aggregate plus 15% aggregate extra to allow for additional voids created by wedging action
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all of the above
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| 9. | The object of compaction is to ? | |
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eradicate air holes
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give maximum density
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ensure intimate contact between the concrete and the surface of reinforcement
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all of the above
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| 10. | Vertical sides of columns may be stripped after ? | |
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1 to 2 days
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7 days
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14 days
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21 days
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