| 1. | Blast furnace slag cement ? | |
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develops low heat of hydration
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Don’t have early strength
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develops high heat of hydration
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has high early strength
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Report Question| 2. | After the final grinding, the cement is sieved through IS sieve number ? | |
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9
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12
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24
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48
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| 3. | The characteristic, which makes the concrete a versatile and widely used material of modem construction, is the possibility of ? | |
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controlling the properties of concrete by using appropriate ingredients
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moulding the concrete in any desired shape
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complete mechanisation of concrete preparation and its placing process
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all of the above
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| 4. | According to IS:383-1970, a good aggregate for concrete construction should be ? | |
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chemically inert
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sufficiently strong
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sufficiently hard and durable
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all of these
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| 5. | Water-cement ratio is, usually, expressed in ? | |
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litres of water required per bag of cement
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litres of water required per kg of cement
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both (a) and (b)
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none of these
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| 6. | The minimum particle size of coarse aggregate is ? | |
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2.5 mm
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4.75 mm
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5.85 mm
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6.5 mm
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| 7. | The value of bulk density for angular and flaky aggregates is ............ as compared to graded aggregates ? | |
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same
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less
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more
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none
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| 8. | The presence of calcium chloride in water ? | |
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accelerates setting of cement
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de-accelerates hardening of cement
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causes little effect on quality of concrete
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all of these
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| 9. | Which of the following statement is wrong ? | |
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The coarse sand produces a harsh and unworkable mix
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An admixture cannot increase the workability of concrete without increasing water content
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Salts of manganese cause a considerable reduction in the strength of concrete
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all of the above
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| 10. | Which of the following statement is correct ? | |
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Larger the size of coarse aggregate, lesser is the quantity of fine aggregate and of cement required
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If very dry aggregates are used, the workability of the mix is likely to be reduced
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Bulking is caused due to the formation of thin film of surface moisture around the sand particles
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all of the above
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