Building Materials

421. In arches, stratified stones are placed so that their planes are

1. Parallel
2. Perpendicular
3. Radial
4. None of these

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422. The fire clay contains pure

1. Lime
2. Oxide of iron
3. Hydrated aluminium silicate
4. Magnesium

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423. Pick up the correct characteristic of Pyroxene from the following:

1. It forms octagonal crystals
2. It converts to chlorine by hydration
3. Its density is 2.3 to 3.6 g/cm²
4. All the above

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424. The base material for distemper, is

1. Chalk
2. Lime
3. Lime putty
4. Cement wash

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425. Slacking of lime is affected by

1. Keeping it exposed to air
2. Immersing the lime in water
3. Crushing the lime lumps
4. None of these

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426. Stones used for the construction of retaining walls must be

1. Soft
2. Hard
3. Light
4. Heavy

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427. Permanent magnets are made of high carbon steel and

1. 15% of cobalt
2. 20% of cobalt
3. 35% of cobalt
4. 45% of cobalt

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428. Stainless steel resists corrosion due to

1. Carbon
2. Sulphur
3. Vanadium
4. Chromium

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429. The most important constituent of varnish, is

1. Drier
2. Solvent
3. Resin
4. All the above

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430. A ferrous metal is

1. Cast iron
2. Wrought iron
3. Steel
4. All the above

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