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


  • Options
  • A. Calcium chloride acts as a retarder
  • B. Gypsum (calcium sulphate) acts as an accelerator
  • C. Gypsum (calcium sulphate) acts as a retarder
  • D. Calcium chloride acts as an accelerator
  • E. Both (c) and (d).

  • Correct Answer
  • Both (c) and (d). 


  • Concrete Technology problems


    Search Results


    • 1. Pick up the correct statement from the following:

    • Options
    • A. High percentage of C3S and low percentage of C2S cause rapid hardening
    • B. High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
    • C. Low percentage of C3S and high percentage of C2S contribute to slow hardening
    • D. Low percentage of C3S and high percentage of C2S provide greater resistance to chemical attack
    • E. All the above.
    • Discuss
    • 2. If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed

    • Options
    • A. 10 cm
    • B. 15 cm
    • C. 20 cm
    • D. 25 cm
    • E. 30 cm
    • Discuss
    • 3. The commercial name of white and coloured cement in India, is

    • Options
    • A. colocrete
    • B. rainbow cement
    • C. silvicrete
    • D. snowcem
    • E. all the above.
    • Discuss
    • 4. The aggregate containing moisture in pores and having its suface dry, is known as

    • Options
    • A. moist aggregates
    • B. very dry aggregates
    • C. dry aggregates
    • D. saturated surface dry aggregate
    • E. none of these.
    • Discuss
    • 5. Pick up the correct statement from the following:

    • Options
    • A. Water enables chemical reaction to take place with cement
    • B. Water lubricates the mixture of gravel, sand and cement
    • C. Only a small quantity of water is required for hydration of cement
    • D. Strength of concrete structure largely depends upon its workability
    • E. All the above.
    • Discuss
    • 6. For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is

    • Options
    • A. 1 : 3 : 6
    • B. 1 : : 3
    • C. 1 : 2 : 4
    • D. 1 : 1 : 2
    • E. 1 : 4 : 8.
    • Discuss
    • 7. Slump test of concrete is a measure ofits

    • Options
    • A. consistency
    • B. compressive strength
    • C. tensile strength
    • D. impact value.
    • Discuss
    • 8. The void ratio of

    • Options
    • A. single size coarse aggregate is roughly 0.45.
    • B. graded coarse aggregate is roughly 0.040
    • C. fine aggregate is roughly 0.45
    • D. all the above.
    • Discuss
    • 9. The condition not applicable to water cement ratio law, is

    • Options
    • A. internal moisture conditions on hydration continue till complete strength is gained
    • B. concrete specimens may be tested at any temperature
    • C. concrete specimens need be of same age
    • D. concrete specimens need be of same size
    • E. none of these.
    • Discuss
    • 10. The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

    • Options
    • A. rounded aggregate
    • B. irregular aggregate
    • C. angular aggregate
    • D. flaky aggregate
    • E. none of these.
    • Discuss


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