Building Materials

371. The commonly used colour pigment in paints, is

1. Ambers
2. Carbon black
3. Iron oxide
4. All the above

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372. The variety of pig iron used for the manufacture of steel by Bessemer process, is

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

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373. Vanadium steel is generally used for

1. Railway switches and crossing
2. Bearing balls
3. Magnets
4. Axles and springs

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374. A badly mixed cement concrete results in

1. Segregation
2. Bleeding
3. Honey combing
4. None of these

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375. Chemically, marble is known as

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

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376. The filler used in plastic bitumen, is

1. Shale powder
2. Talc powder
3. Asbestos powder
4. Plastic powder

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377. Mastic asphalt is generally used for

1. Damp proof course
2. Water proof layer
3. Partition walls
4. Both (A) and (B)

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378. The most fire resistant paints are:

1. Enamel paints
2. Aluminium paints
3. Asbestos paints
4. Cement paints

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379. A pug mill is used for

1. Softening brick earth
2. Moulding brick earth
3. Tempering brick earth
4. Providing brick earth

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380. A good brick earth should contain:

1. About 20% to 30% of alumina
2. About 50% to 60% of silica
3. Not more than 5% of lime
4. All the above

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