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Civil Engineering :: Building Materials

  1. Pick up the correct statement from the following:

  2. A.

     Plastics have generally low melting point

    B.

     The coefficient of thermal expansion of plastics is about three times than that of steel

    C.

     The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67

    D.

     All the above


  3. Pick up the polymineralic rock from the following:

  4. A.

     Quartz sand

    B.

     Pure gypsum

    C.

     Magnesite

    D.

     Granite


  5. Pick up the correct statement from the following:

  6. A.

     Quick lime is obtained by burning pure lime stone

    B.

     Hydraulic lime is obtained by burning lime stone containing clay 5% to 30%

    C.

     Poor lime is obtained by burning lime stone containing impurities more than 5%

    D.

     All the above


  7. Pick up the correct statement from the following:

  8. 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.

     All the above


  9. Pick up the correct statement from the following:

  10. A.

     Rusting is caused due to combined action of air, moisture and carbon dioxide

    B.

     During rusting, first ferrous bicarbonates are formed

    C.

     On further oxidation ferrous bicarbonates get converted to ferric bicarbonates

    D.

     All the above


  11. Pick up the correct statement from the following:

  12. A.

     Slaked lime contains calcium hydroxide

    B.

     Quick lime contains calcium oxide

    C.

     Slaked lime may be obtained from quick lime

    D.

     All the above


  13. Pick up the correct statement from the following:

  14. A.

     Soft stones are required for carving

    B.

     Light stones are required for arches

    C.

     Hard stones are required to stand high pressure

    D.

     All the above


  15. Pick up the correct statement from the following:

  16. A.

     Solder material is an alloy which melts at a temperature above 400°C

    B.

     Brazing is done at temperature above 600°C to 1100°C

    C.

     Brazing joint is stronger than the solder joint

    D.

     All the above


  17. Pick up the correct statement from the following:

  18. A.

     Steel produced by open hearth process is milder than that obtained by the Bessemer process

    B.

     Engineers prefer open hearth steel for structural purpose as it is more homogenous

    C.

     Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel

    D.

     All the above


  19. Pick up the correct statement from the following:

  20. A.

     Styrene resin is produced from ethylene which is made from petroleum

    B.

     Styrene resin is light in weight

    C.

     Styrene resin transmits ultraviolet waves of light

    D.

     All the above