Building Materials

261. Second class bricks

1. Are of dark brown colour
2. Produce a metallic sound when struck
3. Are well burnt
4. Are under burnt

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262. Wrought iron contains carbon upto

1. 0.25%
2. 1.0%
3. 1.5%
4. 2%

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263. The variety of pig iron used for manufacture of wrought iron, is

1. Bessemer pig
2. Grey or foundry pig
3. White forge pig
4. Mottled pig

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264. Kaolin is chemically classified as

1. Metamorphic rock
2. Argillaceous rock
3. Calcareous rock
4. Siliceous rock

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265. Sewer pipes are made of

1. Earthen ware
2. Stone ware
3. Refractory clay
4. All the above

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266. The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as

1. Cementation process
2. Crucible process
3. Bessemer process
4. Open hearth process

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267. The rock generally used for roofing, is

1. Granite
2. Basalt
3. Slate
4. Pumice

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268. The lime which contains mainly calcium oxide and slacks with water, is

1. Fat lime
2. Quick lime
3. Hydraulic lime
4. Poor lime

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269. The standard size of masonry bricks, is

1. 18 cm × 8 cm × 8 cm
2. 19 cm × 9 cm × 9 cm
3. 20 cm × 10 cm × 10 cm
4. 21 cm × 11 cm × 11 cm

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270. The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

1. 15, 75, 10
2. 75, 10, 15
3. 10, 15, 75
4. 10, 75, 15

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