Building Materials

281. Plastic asphalt is

1. Used as a water proofing layer over roof
2. A mixture of cement and asphalt
3. A natural asphalt
4. A refinery product

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282. Pick up the correct statement from the following:

1. Rusting is caused due to combined action of air, moisture and carbon dioxide
2. During rusting, first ferrous bicarbonates are formed
3. On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
4. All the above

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283. The commonly used base for iron and steel work, is

1. Red lead
2. Zinc white
3. White lead
4. Titanium white

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284. For high grade instruments the steel preferred to, is

1. Cast steel
2. Bessemer steel
3. Mild steel
4. Whitworth compressed steel

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285. Bitumen felt is used for

1. Water proofing
2. Damp proofing
3. Both (A) and (B)
4. Neither (A) nor (B)

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286. The most important constituent of an oil paint, is

1. Thinner
2. Vehicle
3. Pigment
4. All the above

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287. Acrylic sheets

1. Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
2. Are generally unaffected by most household detergents
3. Possess the light transmission rate of 93%
4. All the above

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288. Brass is an alloy of

1. Copper and zinc
2. Zinc and lead
3. Tin and silver
4. Zinc and nickel

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289. Pick up the polymineralic rock from the following:

1. Quartz sand
2. Pure gypsum
3. Magnesite
4. Granite

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290. Pick up the hypabyssal rock from the following:

1. Granite
2. Dolerite
3. Basalt
4. All the above

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