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Building Materials - section-9
  1. Pick up the compound responsible for early strength of cement from the following:

    2. A.

     Tetra-calcium alumino-ferrite
    B.

     Tri-calcium silicate
    C.

     Tri-calcium aluminate
    D.

     Di-calcium silicate

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  2. Pick up the correct statement from the following:

    3. A.

     The average crushing strength of hand moulded bricks is 6000 t/m2
    B.

     The average tensile strength of hand moulded brick is 200 t/m2
    C.

     The average shearing strength of hand moulded brick is 600 t/m2
    D.

     All the above

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  3. Pick up the correct statement from the following:

    4. A.

     The distinct plane of division along which a stone can easily be split, is called natural bed of stone
    B.

     The natural bed of sedimentary rocks is along the planes of stratification
    C.

     The natural bed of igneous rocks is not defined
    D.

     All the above

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  4. Pick up the correct statement from the following:

    5. A.

     The free quartz suddenly expands at a temperature lower than 600°C
    B.

     The lime stone resists fire upto about 800°C and at higher temperature it splits into CaO and CO2
    C.

     The sand stone with silicates resist a fire in a better way
    D.

     All the above

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  5. Pick up the correct statement from the following:

    6. 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

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  6. Pick up the correct statement from the following:

    7. A.

     The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
    B.

     The silica in excess makes the cement stronger but its setting time also increases
    C.

     The excess amount of alumina weakens the cement
    D.

     All the above

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  7. Pick up the correct statement from the following:

    8. 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.

     All the above

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  8. Pick up the correct statement from the following:

    9. A.

     The phenol is carbolic acid
    B.

     The phenol is either extracted from coal-tar or prepared from benzene
    C.

     Phenol reacts with formaldehyde, to form phenol formaldehyde resin
    D.

     All the above

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  9. Pick up the correct statement from the following:

    10. A.

     The plastic bottles are made by the process of blowing
    B.

     The application of thermo-setting resins on sheets of paper, is called laminating process
    C.

     The plastic articles made by placing raw material in the desired moulds, is known as moulding process
    D.

     All the above

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  10. Pick up the correct statement from the following:

    11. A.

     The plywoods do not split or crack due to changes in atmosphere
    B.

     The commercial plywoods are available upto 150 cm wide and upto 300 cm long
    C.

     The plywoods possess uniform tensile strength in all directions
    D.

     All the above

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