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Civil Engineering :: Building Materials

  1. Pick up the correct statement from the following:

  2. A.

    The percentage of absorption for firebricks varies from 5 to 10

    B.

    The percentage of silica in silica bricks is to the extent of about 95 to 97 percent

    C.

    Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material

    D.

    The compressive strength of silica bricks is about 150 kg/cm2

    E.

    All the above.


  3. Spirit varnish generally consists of

  4. A.

    oil, wax and resin

    B.

    alcohol, wax and turpentine

    C.

    pigment and synthetic resin

    D.

    spirit and shellac

    E.

    none of these.


  5. Pick up the correct statement from the following:

  6. A.

    Roasting is not necessary if iron ore is an oxide

    B.

    Impurities float on the molten iron as slag

    C.

    The slag contains lime about 45%

    D.

    The molten iron is made to run, in a long channel formed in sand called 'sow'

    E.

    All the above.


  7. The tendency of a stone is, to split along:

  8. A.

    texture

    B.

    fracture

    C.

    cleavage

    D.

    structure

    E.

    all the above.


  9. Acrylic is the name of

  10. A.

    cellulose resin

    B.

    alkyd resin

    C.

    methyl metha crylate

    D.

    cumarone-indene.


  11. Glazing of clay products, is done

  12. A.

    to improve their appearance

    B.

    to protect them from atmospheric effect

    C.

    to protect them from corrosive action

    D.

    all the above.


  13. Lime mortar is generally made with

  14. A.

    quick lime

    B.

    fat lime

    C.

    hydraulic lime

    D.

    plain lime

    E.

    none of these.


  15. Duco paints are

  16. A.

    plastic paints

    B.

    cellulose paints

    C.

    emulsion paints

    D.

    bituminous paints

    E.
    oil paints.

  17. Pick up the correct statement from the following:

  18. A.

    Melamine is obtained from calcium carbide

    B.

    Formaldehyde is prepared synthetically from methane

    C.

    The melamine when reacted with formaldehyde forms the melamine-formaldehyde resin

    D.

    The plastics made from melamine formaldehyde resin, are used for electrical insulators

    E.

    All the above.


  19. Steel contains carbon approximately

  20. A.

    1.50% to 5.6%

    B.

    0.05% to 1.75%

    C.

    0.25%

    D.

    none to these.