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  • Question
  • Pick up the incorrect statement from the following:


  • Options
  • A. Admixtures accelerate hydration
  • B. Admixtures make concrete water proof
  • C. Admixtures make concrete acid proof
  • D. Admixtures give high strength
  • E. None of these.

  • Correct Answer
  • Admixtures accelerate hydration 


  • Concrete Technology problems


    Search Results


    • 1. If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is

    • Options
    • A. M 100
    • B. M 150
    • C. M 200
    • D. M 250
    • E. M 300
    • Discuss
    • 2. Gypsum is added for

    • Options
    • A. colour
    • B. strength
    • C. controlling setting time
    • D. none of these.
    • Discuss
    • 3. An ideal ware house, is provided

    • Options
    • A. water proof masonry walls
    • B. water proof roof
    • C. few windows which remain generally closed
    • D. 15 cm thick concrete floor laid on a dry course of soling
    • E. all the above.
    • Discuss
    • 4. Sand requiring a high water cement ratio, belongs to

    • Options
    • A. Zone I
    • B. Zone II
    • C. Zone III
    • D. Zone IV.
    • Discuss
    • 5. Pick up the incorrect statement from the following:

    • Options
    • A. Tricalcium silicate (C3S) hydrates rapidly
    • B. Tricalcium silicate (C3S) generates more heat of hydration
    • C. Tricalcium silicate (C3S) develops early strength
    • D. Tricalcium silicate (C3S) has more resistance to sulphate attack
    • E. None of these.
    • Discuss
    • 6. Non-uniform compaction may cause the concrete

    • Options
    • A. porous
    • B. non-homogeneous
    • C. reduced strength
    • D. all the above.
    • Discuss
    • 7. The entrained air in concrete

    • Options
    • A. increases workability
    • B. decreases workability
    • C. decreases resistance to weathering
    • D. increases strength
    • E. neither affects workability nor strength.
    • Discuss
    • 8. A concrete having a slump of 6.5 cm, is said to be

    • Options
    • A. dry
    • B. earth moist
    • C. semi-plastic
    • D. plastic
    • E. none of these.
    • Discuss
    • 9. Pick up the incorrect statement from the following. While performing preliminary test on concrete

    • Options
    • A. proportions of the material and water should be the same as to be used at the work site
    • B. cement should be mixed by hand in order to maintain uniformity
    • C. concrete mix should be stored in air-tight containers
    • D. concrete ingredients should be kept at a temperature of 37° ± 2°C
    • E. none of these.
    • Discuss
    • 10. For preparing ordinary concrete, the quantity of water used, is

    • Options
    • A. 5% by weight of aggregates plus 20% of weight of cement
    • B. 10% by weight of aggregates plus 10% of weight of cement
    • C. 5% by weight of aggregates plus 30% of weight of cement
    • D. 30% by weight of aggregates plus 10% of weight of cement
    • E. none of these.
    • Discuss


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