Building Materials

431. For making fly-ash building bricks, the following mix of fly-ash, sand and lime, is

1. 80 : 13 : 7
2. 70 : 20 : 10
3. 60 : 35 : 5
4. None of these

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432. Water paint is a

1. White wash
2. Colour wash
3. Whiting
4. All the above

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433. Spirit varnish generally consists of

1. Oil, wax and resin
2. Alcohol, wax and turpentine
3. Pigment and synthetic resin
4. Spirit and shellac

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434. Duco paints are

1. Plastic paints
2. Cellulose paints
3. Emulsion paints
4. Oil paints

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435. Pick up the correct statement from the following:

1. Melamine is obtained from calcium carbide
2. Formaldehyde is prepared synthetically from methane
3. The melamine when reacted with formaldehyde forms the melamine-formaldehyde resin
4. All the above

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436. Steel contains carbon approximately

1. 1.50% to 5.6%
2. 0.05% to 1.75%
3. 0.0025
4. None to these

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437. Based on its dry weight, a freshly felled tree may contain water

1. 0.25
2. 0.5
3. 0.75
4. 1

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438. Forge pig may be converted to wrought iron by

1. Rolling
2. Pudding
3. Shingling
4. Refining

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439. Pick up the correct statement from the following:

1. Bull's trench kiln a trench excavated in ground
2. Hoffman's kiln is constructed over ground
3. Tunnel Kiln is constructed as a tunnel
4. All the above

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440. The softest rock is

1. Marble
2. Diamond
3. Talc
4. Quartz

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