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  • Question
  • 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.

  • Correct Answer
  • increases workability 


  • Concrete Technology problems


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    • 1. Non-uniform compaction may cause the concrete

    • Options
    • A. porous
    • B. non-homogeneous
    • C. reduced strength
    • D. all the above.
    • Discuss
    • 2. 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.
    • Discuss
    • 3. 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
    • 4. Gypsum is added for

    • Options
    • A. colour
    • B. strength
    • C. controlling setting time
    • D. none of these.
    • Discuss
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Cement used for normal concrete construction, is obtained by burning a mixture of

    • Options
    • A. silicious and argillaceous materials
    • B. argilaceous and calcareous materials
    • C. silicious and catcareous materials
    • D. silicious, argillaceous and calcareous materials
    • E. none of these.
    • Discuss
    • 10. Permissible compressive strength of M 200 concrete grade is

    • Options
    • A. 100 kg/cm2
    • B. 150 kg/cm2
    • C. 200 kg/cm2
    • D. 250 kg/cm2
    • E. 300 kg/cm2
    • Discuss


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