Building Materials

211. Which of the following timbers is suitable for making sports goods?

1. Mulberry
2. Mahogany
3. Sal
4. Deodar

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212. The stones obtained by blasting are used as

1. Ballast in railways
2. Aggregates for concrete
3. Road metal
4. All the above

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213. Pick up the correct statement from the following:

1. Acid test is done to find out the weathering quality of stones
2. Attrition test is done to find out the rate of wear of stones which are used in road construction
3. Crushing test is done to find out the compressive strength of the stone
4. All the above

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214. Mastic asphalt is

1. Water proof
2. Fire proof
3. Elastic
4. All the above

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215. Pick up the correct statement from the following:

1. Lime is available in Free State
2. Lime is available by dissolving calcium carbonate in water
3. Lime is available by calcining calcium carbonate at 900°C
4. Lime is nothing but calcium chloride

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216. The frog of the brick in a brick masonry is generally kept on

1. Bottom face
2. Top face
3. Shorter side
4. Longer side

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217. Pick up the correct statement from the following:

1. Roasting is not necessary if iron ore is an oxide
2. Impurities float on the molten iron as slag
3. The slag contains lime about 45%
4. All the above

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218. For obtaining vinyl chloride acetate, the method used, is

1. Addition polymerization
2. Condensation polymerization
3. Co-polymerization
4. None of these

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219. Whitworth compressed steel is obtained when molten steel is subjected to a pressure of

1. 5 kg/mm²
2. 9 kg/mm²
3. 13 kg/mm²
4. 15 kg/mm²

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220. The normal consistency of ordinary Portland cement is about

1. 10%
2. 20%
3. 30%
4. 40%

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