| 1. | According to IS: 269-1976, the requirement of an ordinary Portland cement is that ? | |
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the residue does not exceed 10% when sieved through IS sieve No. 9
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its expansion is not more than 10 mm for unrated cement
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its initial setting time is not less than 30 minutes
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all of the above
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Report Question| 2. | A compaction factor of 0.88 indicates that the workability of concrete mix is ? | |
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very low
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low
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medium
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high
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| 3. | Blast furnace slag cement is used for ? | |
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dams
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bridge abutments
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retaining walls
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all of these
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| 4. | If 30% excess water is added, the strength of concrete is reduced by ? | |
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30%
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40%
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50%
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60%
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| 5. | Which of the following ingredient of cement when added in excess quantity, causes the cement set slowly ? | |
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Lime
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Silica
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alumina
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iron oxide
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| 6. | The controlled concrete is used for ? | |
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one grade of concrete mix
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three grades of concrete mix
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five grades of concrete mix
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all the seven grades of concrete mix
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| 7. | Which of the following statement is wrong ? | |
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The concrete can not be pumped
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The concrete should have maximum creep
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The concrete structures can be put to use immediately after their construction
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all of the above
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| 8. | The correct proportioning various ingredients of concrete largely depends upon ? | |
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bulking of sand
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water content
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absorption
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all of these
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| 9. | For compacting large sections of mass concrete in structures, the type of vibrator used is ? | |
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internal vibrator
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screed vibrator
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form vibrator
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all of these
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| 10. | In lime concrete, lime is used as ? | |
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coarse aggregate
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fine aggregate
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binding material
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admixture
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