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Civil Engineering :: Building Materials

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Building Materials - Section 5
Building Materials - Section 6
Building Materials - Section 7
Building Materials - Section 8
Building Materials - section-9

  1. The slag which floats on the surface of the molten iron generally contains

    2. A.

    Lime (CaO) 45%
    B.

    Silica (SiO2) 35%
    C.

    Alumina (Al2O3) 12%
    D.

    MgO, CaSO4, KMnO2 and FeO 8%
    E.

    all the above.

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  2. Minimum of 40% of iron, is available in
    3. A.

    Magnetite
    B.

    Red haemetite
    C.

    Limonite
    D.

    Siderite
    E.

    Black band.

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  3.  

    If the iron ore contains clay as an impurity, the flux added during calcination, is
    4. A.

    clay
    B.

    lime stone
    C.

    argillaceous iron ore
    D.

    all the above.

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  4.  

    Cement is said to be of good quality if
    5. A.

    its colour is not greenish grey
    B.

    one feels cool by thrusting one's hand in the cement bag
    C.

    it is not smooth when rubbed in between fingers
    D.

    a handful of cement thrown into a bucket of water does not float
    E.
    none of these.

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  5. Cast steel is manufactured by

    6. A.

    Cementation process
    B.

    Crucible process
    C.

    Bessemer process
    D.

    Open hearth process.

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  6. For the manufacture of plywood, veneers are placed so that grains of adjacent veneers

    7. A.

    run at right angles
    B.

    parallel
    C.

    inclined at 45°
    D.

    inclined at 60°.

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  7. A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than

    8. A.

    10%
    B.

    15%
    C.

    20%
    D.

    25%
    E.

    5%.

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  8. The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

    9. A.

    15, 75, 10
    B.

    75, 10, 15
    C.

    10, 15, 75
    D.

    10, 75, 15.

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  9. Geologically, marble is known as

    10. A.

    sedimentary rock
    B.

    igneous rock
    C.

    metamorphic rock
    D.

    stratified rock.

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