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Building Materials - section-9
  1. Asphalt is obtained from

    2. A.

     Petroleum distillation
    B.

     Bitumen distillation
    C.

     Plastic distillation
    D.

     None of these

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  2. The normal curing period for lime mortar, is:

    3. A.

     1 day
    B.

     3 days
    C.

     7 days
    D.

     10 days

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  3. Glazing is used to make earthenware

    4. A.

     hard
    B.

     soft
    C.

     porous
    D.

     impervious

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  4. Pug mill is used for

    5. A.

     Preparation of clay
    B.

     Moulding of clay
    C.

     Drying of bricks
    D.

     Burning of bricks

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  5. A pug mill is used for

    6. A.

     Softening brick earth
    B.

     Moulding brick earth
    C.

     Tempering brick earth
    D.

     Providing brick earth

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  6. The nominal size of the modular brick is

    7. A.

     190 mm × 90 mm × 80 mm
    B.

     190 mm × 190 mm × 90 mm
    C.

     200 mm × 100 mm × 100 mm
    D.

     200 mm × 200 mm × 100 mm

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  7. Clay and silt content in a good brick earth must be at least

    8. A.

     50 %
    B.

     40 %
    C.

     30 %
    D.

     25 %

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  8. The initial setting time for ordinary Portland cement as per IS specifications should not be less than

    9. A.

     10 minutes
    B.

     30 minutes
    C.

     60 minutes
    D.

     600 minutes

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  9. According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than

    10. A.

     7 MPa
    B.

     11.5 MPa
    C.

     16 MPa
    D.

     21 MPa

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  10. Crushing strength of a first class brick should not be less than

    11. A.

     3.5 N/mm²
    B.

     7.0 N/mm²
    C.

     10.5 N/mm²
    D.

     14.0 N/mm²

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