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Building Materials - section-9
  1. The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is

    2. A.

     1
    B.

     2
    C.

     3
    D.

     4

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  2. The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick

    3. A.

     20 %
    B.

     15 %
    C.

     10 %
    D.

     None of these

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  3. Seasoning of timber is done for

    4. A.

     Increasing moisture content
    B.

     Decreasing moisture content
    C.

     Increasing strength of timber
    D.

     None to these

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

    5. A.

     30 minutes
    B.

     60 minutes
    C.

     90 minutes
    D.

     120 minutes

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  5. Priming consists of

    6. A.

     One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
    B.

     8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
    C.

     One part of white lead, 8 parts of chalk and one part of linseed oil
    D.

     None to these

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  6. The main function of alumina in brick earth is

    7. A.

     To impart plasticity
    B.

     To make the brick durable
    C.

     To prevent shrinkage
    D.

     To make the brick impermeable

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  7. A well seasoned timber may contain moisture up to

    8. A.

     4 to 6 %
    B.

     6 to 8 %
    C.

     8 to 10 %
    D.

     10 to 12 %

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  8. The commonly used thinner in oil paints, is

    9. A.

     Naphtha
    B.

     Turpentine
    C.

     Both (a) and (b)
    D.

     None the these

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  9. Most commonly used solvent in oil paints, is

    10. A.

     Petroleum
    B.

     Spirit
    C.

     Coal tar
    D.

     Turpentine

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  10. Plaster of Paris is obtained by calcining

    11. A.

     Bauxite
    B.

     Gypsum
    C.

     Lime stone
    D.

     None of these

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