Concrete Technology and Design

281. The shrinkage of concrete

1. Is proportional to water content is the mix
2. Is proportional to cement concrete
3. Increases with age of concrete
4. All the above

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282. The shuttering of a hall measuring 4 m × 5 m, can be removed after

1. 5 days
2. 7 days
3. 10 days
4. 14 days

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283. The size of fine aggregates does not exceed

1. 2.75 mm
2. 3.00 mm
3. 3.75 mm
4. 4.75 mm

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284. The slab is designed as one way if the ratio of long span to short span is

1. Less than 1
2. Between 1 and 1.5
3. Between 1.5 and 2
4. Greater than 2

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285. The specifications of a cement bag for storage, are

1. Weight 50 kg
2. Height 18 cm
3. Plan area 3000 sq. cm
4. All the above

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286. The strength and quality of concrete, depend upon:

1. Grading of aggregates
2. Surface area of aggregates
3. Shape of aggregates
4. All the above

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287. The strength of concrete after one year as compared to 28 days strength is about

1. 10 to 15% more
2. 15 to 20% more
3. 20 to 25% more
4. 25 to 50% more

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288. The surface where two successive placements of concrete meet, is known as

1. Contraction joint
2. Expansion joint
3. Construction joint
4. Both (a) and (b)

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289. The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is

1. Not needed
2. Provided equally on inner and front faces
3. Provided more on inner face than on front face
4. Provided more on front face than on inner face

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290. The top diameter, bottom diameter and the height of a slump mould are:

1. 10 cm, 20 cm, 30 cm
2. 10 cm, 30 cm, 20 cm
3. 20 cm, 10 cm, 30 cm
4. 20 cm, 30 cm, 10 cm

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