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Building Materials - section-9
  1. Which of the following stone is best suited for construction of piers and abutments of a railway bridge?

    2. A.

     Granite
    B.

     Sand stone
    C.

     Lime stone
    D.

     Quartzite

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  2. Acrylic sheets

    3. A.

     Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
    B.

     Are generally unaffected by most household detergents
    C.

     Possess the light transmission rate of 93%
    D.

     All the above

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  3. Wrought iron contains carbon about

    4. A.

     1.5% to 5.5%
    B.

     0.5% to 1.75%
    C.

     0.1% to 0.25%
    D.

     None to these

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  4. The usual percentages of clay and metal in cermet are:

    5. A.

     50%, 50%
    B.

     60%, 40%
    C.

     70%, 30%
    D.

     80%, 20%

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  5. Good quality stones must

    6. A.

     Be durable
    B.

     Be free from clay
    C.

     Resist action of acids
    D.

     All the above

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  6. Spalling hammer is used for

    7. A.

     Driving wooden headed chisels
    B.

     Rough dressing of stones
    C.

     Carving of stones
    D.

     Breaking small projection of stones

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  7. In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is

    8. A.

     Right angles
    B.

     45°
    C.

     60°
    D.

     Parallel

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  8. Chemically, marble is known as

    9. A.

     Metamorphic rock
    B.

     Argillaceous rock
    C.

     Calcareous rock
    D.

     Siliceous rock

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

    11. A.

     15, 75, 10
    B.

     75, 10, 15
    C.

     10, 15, 75
    D.

     10, 75, 15

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