| 1. | The workability of concrete is defined as the ? | |
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ease with which it can be mixed, transported and placed in position in a homogenous state
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breaking up of cohesion in a mass of concrete
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separation of water or water-cement mixture from the freshly mixed concrete
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none of the above
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Report Question| 2. | The admixtures are added in concrete to ? | |
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accelerate the rate of setting and hardening of cement
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make the concrete water proof, acid proof etc.
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reduce the bleeding and segregation of concrete mix
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all of the above
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| 3. | The strength of concrete using air entraining cement gets reduced by ? | |
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5 to 10%
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10 to 15%
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15 to 20%
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20 to 25%
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| 4. | In performing preliminary test ? | |
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the moulds required for test specimens should be rigid
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the mix should be stored in air-tight containers
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the aggregates should be dry
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all of the above
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| 5. | The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M 20 ? | |
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1:1:2
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1:1.5:3
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1:2:4
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1:3:6
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| 6. | The process of mixing, transporting, placing and compacting the cement concrete should not take more than ? | |
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30 minutes
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60 minutes
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90 minutes
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120 minutes
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| 7. | The factor which effect the quality of compaction, is ? | |
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density of concrete
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strength of concrete
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durability of concrete
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all of these
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| 8. | According to the rule of water cement ratio, the strength of concrete wholly depends upon ? | |
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the quality of cement
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the quality of cement mixed with aggregate
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the amount of water used in preparation of concrete mix
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all of the above
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| 9. | In Vicat's apparatus, the diameter of Vicat plunger is ? | |
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5 mm
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10 mm
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15 mm
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20 mm
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| 10. | The bulk density of aggregates depends upon its ? | |
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shape
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grading
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compaction
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all of these
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