Building Materials

381. The compound of Portland cement which contributes to the strength after two to three years is

1. Tri-calcium silicate
2. Di-calcium silicate
3. Tri-calcium aluminate
4. Tetra-calcium alumino ferrite

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382. Bessemer process is used for the manufacture of

1. Pig iron
2. Cast iron
3. Wrought iron
4. Steel

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383. Which one of the following is an air binding material?

1. Gypsum
2. Acid-resistant cement
3. Quick lime
4. All of these

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384. A good quality stone absorbs water less than

1. 5%
2. 10%
3. 15%
4. 25%

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385. The slag which floats on the surface of the molten iron generally contains

1. Lime (CaO) 45%
2. Silica (SiO₂) 35%
3. Alumina (Al₂O₃) 12% and MgO, CaSO₄, KMnO₂ and FeO 8%
4. All the above

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386. For the manufacture of plywood, veneers are placed so that grains of adjacent veneers

1. Run at right angles
2. Parallel
3. Inclined at 45°
4. Inclined at 60°

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387. The commonly used drying oil for oil paints, is

1. Olive oil
2. Linseed oil
3. Kerosene oil
4. Acetate of lead

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388. Initial setting of cement is caused due to

1. Tri-calcium silicate
2. Di-calcium silicate
3. Tri-calcium aluminate
4. Tetra calcium alumino ferrite

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389. Wrought iron is manufactured from pig iron by

1. Refining
2. Pudding
3. Shingling
4. All the above

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390. Fibre boards can be

1. Distempered
2. Painted
3. Painted and distempered
4. Used for furniture

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