Building Materials

411. In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is

1. Right angles
2. 45°
3. 60°
4. Parallel

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412. The most durable varnish is

1. Water varnish
2. Spirit varnish
3. Turpentine varnish
4. Oil varnish

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413. Softer variety of steel may be obtained by

1. Cementation process
2. Crucible process
3. Bessemer process
4. Open hearth process

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414. Bitumen emulsion is

1. A liquid containing bitumen in suspension
2. A paint
3. Used as anti-corrosive paint
4. All the above

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415. Plastic bitumen is generally used for

1. Road pavements
2. Expansion joints
3. Crack fillings
4. None to these

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416. Asbestos is

1. Corrugated sheet used for roofing
2. An incombustible fire proof material
3. An organic substance
4. All the above

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417. The rocks which are formed due to pouring of magma at the earth's surface are called

1. Plutonic rocks
2. Hypabyssal rocks
3. Volcanic rocks
4. Igneous rocks

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418. Invar contains

1. 12% of nickel
2. 24% of nickel
3. 30% to nickel
4. 36% of nickel

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419. Distemper is

1. A paint consisting of powdered chalk, pigments and water
2. A water proofing agent
3. A paint consisting of coloured cement and water
4. A drying agent

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420. The compound of Portland cement which reacts immediately with water and also sets first is

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

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