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Building Materials - section-9
  1. Wrought iron is manufactured from pig iron by

    2. A.

     Refining
    B.

     Pudding
    C.

     Shingling
    D.

     All the above

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  2. Pig iron is manufactured from the ores by

    3. A.

     Dressing
    B.

     Calcination and roasting
    C.

     Smelting
    D.

     All the above

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  3. Quick lime is
    (i) Slow in setting
    (ii) Rapid in slacking
    (iii) Good in strength

    4. A.

     Only (i)
    B.

     Only (ii)
    C.

     Both (i) and (ii)
    D.

     Both (ii) and (iii)

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  4. Percentage of carbon content in mild steel is

    5. A.

     Less than 0.25
    B.

     Between 0.25 and 0.7
    C.

     Between 0.7 and 1.5
    D.

     Greater than 1.5

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  5. Wrought iron is used for

    6. A.

     Structural works in beams
    B.

     Small sized water pipes
    C.

     Columns and struts
    D.

     None to these

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  6. Cast iron is used for

    7. A.

     Structural works in beams
    B.

     Small sized water pipes
    C.

     Columns and struts
    D.

     None to these

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  7. Bulking of sand is caused due to

    8. A.

     Surface moisture
    B.

     Air voids
    C.

     Viscosity
    D.

     Clay contents

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  8. Initial setting of cement is caused due to

    9. A.

     Tri-calcium silicate
    B.

     Di-calcium silicate
    C.

     Tri-calcium aluminate
    D.

     Tetra calcium alumino ferrite

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  9. Early attainment of strength in rapid hardening cement is mainly due to

    10. A.

     Gypsum
    B.

     Finer grinding
    C.

     Tri-calcium silicate
    D.

     Tri-calcium aluminate

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  10. Gneiss is obtained from

    11. A.

     Igneous rocks
    B.

     Metamorphic rocks
    C.

     Sedimentary rocks
    D.

     Sedimentary metamorphic rocks

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