Building Materials

391. Lime concrete is generally used for

1. Wall foundations
2. Flooring at ground level
3. Both (A) and (B)
4. Neither (A) nor (B)

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392. Bituminous fells are used for

1. Covering A.C. sheets
2. Covering sloping roofs
3. D.P.C.
4. None to these

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393. Quick setting cement is produced by adding

1. Less amount of gypsum in very fine powdered form
2. More amount of gypsum in very fine powdered form
3. Aluminium sulphate in very fine powdered form
4. Pozzolana in very fine powdered form

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394. Pick up the correct statement from the following:

1. The substance which consists of one primary chemical, is known as monomer
2. The polymer consists of thousands of monomers joined together
3. The polymer molecule is called macro-molecule
4. All the above

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395. The normal curing period for lime mortar, is:

1. 1 day
2. 3 days
3. 7 days
4. 10 days

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396. German silver is an alloy of

1. Zinc, lead and nickel
2. Silver, gold and lead
3. Copper, nickel and zinc
4. Copper, brass and zinc

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397. For the manufacture of stainless steel, steel is mixed with

1. Chromium
2. Nickel
3. Tungsten
4. None of these

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398. The presence of original rounded surface on the manufactured piece of timber, is called

1. Wane
2. Torn grain
3. Diagonal grain
4. Chipmark

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399. In paints, the pigment is responsible for

1. Durability
2. Colour
3. Smoothness
4. Glassy face

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400. The operation of removal of impurities or clay adhering to iron ores, is known as

1. Dressing
2. Calcination
3. Roasting
4. Smelting

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