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Civil Engineering :: Concrete Technology

  1. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is

  2. A.

    30%

    B.

    40%

    C.

    50%

    D.

    60%

    E.

    70%

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  3. For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are

  4. A.

    70 litres of sand and 120 litres of aggregates

    B.

    70 kg of sand and 140 litres of aggregates

    C.

    105 litres of sand and 140 litres of aggregates

    D.

    105 litres of sand and 210 litres of aggregates

    E.

    none of these.

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  5. The process of hardening the concrete by keeping its surface moist is known

  6. A.

    placing

    B.

    wetting

    C.

    curing

    D.

    compacting

    E.

    none of these.

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  7. The grade of concrete not recommended by I.S. : 456, is

  8. A.

    M 100

    B.

    M 200

    C.

    M 300

    D.

    M 400

    E.

    M 500

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  9. C.R.R.I. charts are used to obtain a relatioship between strength of concrete and

  10. A.

    water cement ratio

    B.
    workability
    C.

    grading of aggregate

    D.

    fineness modulus

    E.

    none of these.

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  11.  

    Proper batching ensures

  12. A.

    economy

    B.

    durability

    C.

    workability

    D.

    strength

    E.

    all the above.

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  13. Workability of concrete for a given water content is good if the aggregates, are

  14. A.

    rounded aggregate

    B.

    irregular aggregate

    C.

    angular aggregate

    D.

    flaky aggregates.

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  15. Pick up the correct statement from the following:

  16. A.

    Bulking of sand is caused due to formation of a thin film of surface moisture

    B.

    Fine sand bulks more than coarse sand

    C.

    With 10% moisture content by weight, the bulking of sand is increased by 50%.

    D.

    The volume of fully saturated sand, is equal to the volume of dry and loose sand

    E.
    All the above.

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  17. For compacting plain concrete road surface of thickness less than 20 cm, we use

  18. A.

    internal vibrator

    B.

    screed vibrator

    C.

    form vibrator

    D.

    none of these.

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  19. Pick up the correct statement from the following:

  20. A.

    Construction joints are necessarily planned for their locations

    B.
    Expansion joints are provided to accommodate thermal expansion
    C.

    Construction joints are provided to control shrinkage cracks

    D.

    Expansion joints need not be provided in foundation concrete

    E.
    All the above.

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