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Civil Engineering :: Building Materials

  1. Softer variety of steel may be obtained by

  2. A.

    Cementation process

    B.

    crucible process

    C.

    Bessemer process

    D.

    Open hearth process.


  3. Pick up the correct statement from the following:

  4. A.

    The baked earth is called terra-cotta

    B.

    The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called earthen-ware

    C.

    The articles prepared from refractory clays which as mixed with stone and crushed pottery, are called stone ware

    D.

    The articles prepared from fine earthen ware which is white, thin and semi-transparent, are called procelain

    E.

    All the above.


  5. Calcination of iron ores is done

  6. A.

    to remove moisture

    B.

    to remove carbonic acid

    C.

    by roasting in heaps

    D.

    after dressing

    E.

    all the above.


  7. Strength of cement concrete primarily depends upon

  8. A.

    quality of water

    B.

    quantity of aggregate

    C.

    quantity of cement

    D.

    water-cement ratio.


  9. Rapid hardening cement contains

  10. A.

    Tri-calcium silicate

    B.

    Tri-calcium aluminate

    C.

    Tetra-calcium alumino-ferrite

    D.

    Dicalcium silicate.


  11. Bitumen emulsion is

  12. A.

    a liquid containing bitumen in suspension

    B.

    a paint

    C.

    used as anti-corrosive paint

    D.

    all the above.


  13. The cast iron when heated to red heat with powdered red haemetite in an oven for increasing its toughness, is converted to

  14. A.

    grey cast iron

    B.

    white cast iron

    C.

    mottled cast iron

    D.

    toughed cast iron.


  15. Jhumb bricks are

  16. A.

    under burnt

    B.

    over burnt

    C.

    kutcha

    D.

    none of these.


  17. Plastic bitumen is generally used for

  18. A.

    road pavements

    B.

    expansion joints

    C.

    crack fillings

    D.

    none to these.


  19.  

    Pick up the correct statement from the following:

  20. A.

    The heating of a material to redness in contact with air, is known as calcination

    B.

    The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting

    C.

    The product that remains after calcination of limestone, is called lime

    D.

    All the above.