Building Materials

361. The initial setting time of lime-pozzolana, is

1. 30 minutes
2. 60 minutes
3. 90 minutes
4. 120 minutes

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362. The clay to be used for manufacturing bricks for a large project, is dugout and allowed to weather throughout

1. The monsoon
2. The winter
3. The summer
4. None of these

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363. If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called

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

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364. Depending on the chemical composition and mechanical properties, iron may be classified as

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

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365. The main constituent of fly-ash, is

1. Aluminium oxide
2. Silica
3. Ferrous oxide
4. All of these

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366. Brittleness of cold is due to an excess of

1. Sulphur
2. Carbon
3. Phosphorus
4. Silicon

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367. Asbestos cement

1. Is brittle
2. Warps due to changes in humidity
3. Strength is lowered when saturated by water
4. All of the above

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368. Gneiss is obtained from

1. Igneous rocks
2. Metamorphic rocks
3. Sedimentary rocks
4. Sedimentary metamorphic rocks

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369. Fibre glass

1. Retains heat-longer
2. Has a higher strength to weight ratio
3. Is shock proof and fire retardant
4. All the above

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370. Pick up the correct statement from the following:

1. The theory of formation of concrete is based on the phenomena of formation of voids
2. The bulking of sand is taken into account while volumetric proportioning of the aggregates
3. The dry sand and the sand completely flooded with water, have practically the same volume
4. All the above

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