Building Materials

271. Knots in timber are

1. Defects caused by crushing fibres
2. Splits radiating from the centre
3. Speckled strains
4. Signs of branches cut off

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272. Pick up correct statement from the following:

1. Fibre boards are used for thermal and acoustic control
2. Fibre boards are used for light weight standing members
3. Fibre boards are obtained by impregnating a resin product on fibres
4. All the above

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273. Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as

1. Quick setting cement
2. Rapid hardening cement
3. White cement
4. Low heat Portland cement

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274. Pick up the correct statement from the following:

1. Slaked lime contains calcium hydroxide
2. Quick lime contains calcium oxide
3. Slaked lime may be obtained from quick lime
4. All the above

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275. The minimum compressive strength of 1st class bricks should be

1. 75 kg/cm²
2. 90 kg/cm²
3. 100 kg/cm²
4. 120 kg/cm²

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276. The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to

1. Grey cast iron
2. White cast iron
3. Mottled cast iron
4. Toughed cast iron

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277. A well seasoned timber may contain moisture up to

1. 4 to 6 %
2. 6 to 8 %
3. 8 to 10 %
4. 10 to 12 %

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278. The usual percentages of clay and metal in cermet are:

1. 50%, 50%
2. 60%, 40%
3. 70%, 30%
4. 80%, 20%

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279. Pick up the correct statement from the following:

1. The plastic bottles are made by the process of blowing
2. The application of thermo-setting resins on sheets of paper, is called laminating process
3. The plastic articles made by placing raw material in the desired moulds, is known as moulding process
4. All the above

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280. The specific gravity of marble, is

1. 2.5
2. 2.6
3. 2.66
4. 2.72

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