Building Materials

301. Jhumb bricks are

1. Under burnt
2. Over burnt
3. Kutcha
4. None of these

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302. Pick up the correct statement from the following:

1. Steel produced by open hearth process is milder than that obtained by the Bessemer process
2. Engineers prefer open hearth steel for structural purpose as it is more homogenous
3. Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
4. All the above

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303. Refractory bricks resist

1. High temperature
2. Chemical action
3. Dampness
4. All the above

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304. The thermosetting plastic

1. Becomes rigid when moulded at suitable pressure and temperature
2. At 127°C to 177°C permanently set and further application of heat does not soften it
3. Chars at 343°C
4. All the above

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305. Commonly used thinner in

1. Lacquer paints, is alcohol
2. Cellulose paints is ethyl acetate
3. Oil paints, is naphtha
4. All the above

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306. The curved swellings from the growth of layers or wounds left after branches are cut off in an irregular manner are known as

1. Knots
2. Rindgalls
3. Burls
4. None of these

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307. Bitumen completely dissolves in

1. Carbon bisulphide
2. Chloroform
3. Coal tar
4. All of these

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308. A stone is rejected if it absorbs water more than

1. 5%
2. 10%
3. 15%
4. 20%

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309. The most commonly used synthetic abrasive is

1. Aluminium carbide
2. Boric acid
3. Silicon
4. All of these

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310. During smelting process, the combination of fuel in the furnace

1. Forms carbon dioxide
2. Carbon dioxide with carbon forms carbon mono-oxide
3. Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
4. All the above

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