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Building Materials - section-9
  1. Percentage of silica in a good brick earth lies between

    2. A.

     5 to 10 %
    B.

     20 to 30 %
    C.

     50 to 60 %
    D.

     70 to 80 %

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  2. The percentage of alumina in a good brick earth lies between

    3. A.

     5 to 10 %
    B.

     20 to 30 %
    C.

     50 to 60 %
    D.

     70 to 80 %

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  3. Asbestos

    4. A.

     Is a natural fibrous mineral substance
    B.

     Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
    C.

     Contains iron oxide and alumina
    D.

     All the above

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  4. Asbestos

    5. A.

     Is an excellent insulator for heat and electricity
    B.

     Is fire-proof and acid proof
    C.

     Has sp. gravity equal to 3.10
    D.

     All the above

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  5. Asbestos cement

    6. A.

     Is brittle
    B.

     Warps due to changes in humidity
    C.

     Strength is lowered when saturated by water
    D.

     All of the above

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  6. Asbestos is

    7. A.

     Corrugated sheet used for roofing
    B.

     An incombustible fire proof material
    C.

     An organic substance
    D.

     All the above

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  7. The standard size of masonry bricks, is

    8. A.

     18 cm x 8 cm x 8 cm
    B.

     19 cm x 9 cm x 9 cm
    C.

     20 cm x 10 cm x 10 cm
    D.

     21 cm x 11 cm x 11 cm

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  8. The stone suitable for rubble masonry should be.

    9. A.

     Hard
    B.

     Tough
    C.

     Heavy
    D.

     Light

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  9. The filler used in plastic bitumen, is

    10. A.

     Shale powder
    B.

     Talc powder
    C.

     Asbestos powder
    D.

     Plastic powder

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  10. Softer variety of steel may be obtained by

    11. A.

     Cementation process
    B.

     Crucible process
    C.

     Bessemer process
    D.

     Open hearth process

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