Concrete Technology and Design

231. The final operation of finishing floors, is known as

1. Screeding
2. Floating
3. Trowelling
4. Finishing

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232. The fineness modulus of fine aggregate is in the range of

1. 2.0 to 3.5
2. 3.5 to 5.0
3. 5.0 to 7.0
4. 6.0 to 8.5

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233. The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning

1. 1 : 1 : 2
2. 1 : 2 : 4
3. 1 : 3 : 6
4. 1 : 4 : 10

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234. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

1. 100 kg/cm²
2. 150 kg/cm²
3. 200 kg/cm²
4. 250 kg/cm²

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235. The grade of concrete not recommended by I.S. : 456, is

1. M 100
2. M 200
3. M 300
4. M 500

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236. The high strength of rapid hardening cement at early stage, is due to its

1. Finer grinding
2. Burning at high temperature
3. Increased lime cement
4. Higher content of tricalcium

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237. The impurity of mixing water which affects the setting time and strength of concrete, is

1. Sodium sulphates
2. Sodium chlorides
3. Sodium carbonates and bicarbonates
4. Calcium bicarbonates

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238. The increased cohesiveness of concrete, makes it

1. Less liable to segregation
2. More liable to segregation
3. More liable to bleeding
4. More liable for surface scaling in frosty weather

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239. The individual variation between test strength of sample should not be more than

1. ±5 % of average
2. ± 10 % of average
3. ± 15 % of average
4. ±20 % of average

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240. The internal dimensions of a ware house are 15 m × 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are

1. 1500 bags
2. 2000 bags
3. 2500 bags
4. 3000 bags

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