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Building Materials - section-9
  1. Due to attack of dry rot, the timber

    2. A.

     Cracks
    B.

     Shrinks
    C.

     Reduces to powder
    D.

     None of these

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  2. Rapid hardening cement attains early strength due to

    3. A.

     Larger proportion of lime grounded finer than normal cement
    B.

     Lesser proportion of lime grounded coarser than normal cement
    C.

     Lesser proportion of lime grounded finer than normal cement
    D.

     Excess percentage of gypsum

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  3. The yield strength and tensile strength of low carbon steel may be improved by the addition of

    4. A.

     Manganese
    B.

     Chromium
    C.

     Nickel
    D.

     Vanadium

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  4. Commonly used thinner in

    5. A.

     Lacquer paints, is alcohol
    B.

     Cellulose paints is ethyl acetate
    C.

     Oil paints, is naphtha
    D.

     All the above

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  5. Which of the following trees yields hard wood?

    6. A.

     Deodar
    B.

     Chir
    C.

     Shishum
    D.

     Pine

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  6. The practical limit of moisture content achieved in air drying of timber is

    7. A.

     5 %
    B.

     15 %
    C.

     25 %
    D.

     35 %

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  7. Which of the following represents a metamorphic rock?
    (i) Slate
    (ii) Shale
    (iii) Quartzite

    8. A.

     Only (iii)
    B.

     Both (i) and (iii)
    C.

     Both (ii) and (iii)
    D.

     All (i), (ii) and (iii)

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