Building Materials

451. Pegmatite is a/an

1. Intrusive igneous rock
2. Extrusive igneous rock
3. Sedimentary rock
4. Metamorphic rock

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452. Dorry's testing machine is used for

1. Crushing test of stone
2. Hardness test of stone
3. Impact test of stone
4. Water absorption test

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453. Dolomite is a lime stone which contains carbonate of magnesia upto

1. 15 %
2. 20 %
3. 25 %
4. 45 %

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454. The portion of the brick cut across its width and having its length equal to that of a full brick, is known as

1. Closer
2. Queen closer
3. King closer
4. Prince closer

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455. The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is

1. 20
2. 15
3. 5
4. 0

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456. For a 50 kg cement bag water required, is

1. 16.5 litres
2. 18.5 litres
3. 20.5 litres
4. 22.5 litres

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457. Slump test for concrete is carried out, to determine

1. Strength
2. Durability
3. Workability
4. Water content

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458. The frog of a brick is normally made on its

1. Top face
2. Bottom face
3. Longer face
4. Shorter side

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459. Granite mainly composed of quartz and feldspar particles, is obtained from

1. Sedimentary rocks
2. Metamorphic rocks
3. Igneous rocks
4. All the above

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460. Pig iron obtained from the furnace which is properly provided with fuel at a very high temperature, is called

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

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