| 1. | An aggregate is said to be ............. aggregate if its size more than 75 mm ? | |
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coarse
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fine
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cyclopean
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none
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Report Question| 2. | If the slump of concrete mix is 70 mm, its workability is considered to be ? | |
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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. | Harshness in concrete is due to the excess of ? | |
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water
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finer particles
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middle sized particle
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coarser particles
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| 4. | As per IS: 459-1978, the concrete mixes are designated into ? | |
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4 grades
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5 grades
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6 grades
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7 grades
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| 5. | In performing the works test ? | |
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the mould for test specimen should be made of non-absorbent material
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the mould should be constructed in such a way that there is leakage of water from test specimen during moulding
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the base plate of the mould should be of non-absorbent material
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all of the above
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| 6. | Which of the following statement is correct ? | |
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The high early strength is obtained by adding tricalcium silicate in cement
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The dicalcium silicate provides good ultimate strength to cement
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The tetra calcium alumino ferrite has poor cementing value
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all of the above
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| 7. | The lime concrete has .......... strength as compared to cement concrete ? | |
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less
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more
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same
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any of the above
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| 8. | The main object of proportioning concrete is to obtain ? | |
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required strength and workability
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desired durability
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water tightness
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all of these
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| 9. | For high degree of workability, the slump value should vary between ? | |
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0 to 25 mm
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25 to 50 mm
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50 to 80 mm
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80 to 100 mm
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| 10. | The use of air-entraining agents in concrete ? | |
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increases workability of concrete
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decreases bleeding
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decreases strength
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all of these
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