Building Materials

331. Pick up the correct statement from the following:

1. The percentage of absorption for firebricks varies from 5 to 10
2. The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
3. Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
4. All the above

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332. Good quality cement contains higher percentage of

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

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333. Laterite is a/an

1. Volcanic rock
2. Argillaceous rock
3. Calcareous rock
4. Siliceous rock

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334. Seasoning of timber is essential to remove

1. Knots from timber
2. Sap from timber
3. Twisted fibre from timber
4. Roughness of timber

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335. The term frog means

1. An apparatus to lift the stone
2. A depression on a face of brick
3. Vertical joint in a brick work
4. Soaking brick in water

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336. The presence of sand in brick earth prevents:

1. Cracking of bricks
2. Shrinkage of bricks
3. Warping of bricks
4. None of these

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337. Refractory bricks are

1. Neutral refractory bricks
2. Acid refractory bricks
3. Basic refractory bricks
4. All the above

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338. A prime coat is given to steel work with

1. An oxide of iron paint
2. A mixture of white lead and lead paint
3. A special paint
4. Cement paint

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339. Teak wood is suitable for

1. Sports articles
2. Furnitures
3. Railway sleepers
4. All the above

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340. Elastomers can extend upto

1. Five times their original dimensions
2. Seven times their original dimensions
3. Ten times their original dimensions
4. Three times their original dimensions

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