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Civil Engineering :: Building Materials

  1. Wrought iron contains carbon about

  2. A.

    1.5% to 5.5%

    B.

    0.5% to 1.75%

    C.

    0.1% to 0.25%

    D.

    none to these.


  3. The main constituent of fly-ash, is

  4. A.

    aluminium oxide

    B.

    silica

    C.

    ferrous oxide

    D.

    All of these.


  5. Bitumen in

  6. A.

    solid state, is called asphalt

    B.

    semi fluid state, is called mineral tar

    C.

    fluid state, is called petroleum

    D.

    all the above.


  7. If θ is the vertical angle of an inclined sight, δ is the angle of tilt of the staff, the error

  8. A.

    B.

    C.

    D.

    none of these.


  9. The plastics made from cellulose resin

  10. A.

    are as clear as glass

    B.

    are tough and strong

    C.

    possess excellent electrical properties

    D.

    All the above.


  11. Kaolin is chemically classified as

  12. A.

    metamorphic rock

    B.

    argillaceous rock

    C.

    calcareous rock

    D.

    silicious rock.


  13. Which one of the following is acid resistant asbestos:

  14. A.

    actinolite asbestos

    B.

    actinolite asbestos

    C.

    anthophylite asbestos

    D.

    crocidolite asbestos

    E.

    All the above.


  15. Due to attack of dry rot, the timber

  16. A.

    cracks

    B.

    shrinks

    C.

    reduces to powder

    D.
    none of these.

  17. Brittleness of cold is due to an excess of

  18. A.

    sulphur

    B.

    carbon

    C.

    phosphorus

    D.

    silicon.


  19. For the manufacture of Portland cement, the proportions of raw materials used, are

  20. A.

    lime 63% ; silica 22% ; other ingredients 15%

    B.

    lime 22% ; silica 63% ; other ingredients 15%

    C.

    silica 40% ; lime 40% ; other ingredients 20%

    D.

    silica 70% ; lime 20% ; other ingredients 10%.