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  • Question
  • Saw dust can be rendered chemically inert by boiling it in water containing


  • Options
  • A. ferrous sulphate
  • B. potassium chloride
  • C. ammonia
  • D. nitric acid
  • E. sulphuric acid.

  • Correct Answer
  • ferrous sulphate 


  • Concrete Technology problems


    Search Results


    • 1. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

    • Options
    • A. low-heat Portland cement
    • B. rapid hardening Portland cement
    • C. Portland blast slag cement
    • D. Portland pozzolana cement
    • E. none of these.
    • Discuss
    • 2. For concreting tunnel linings, tran-portation of concrete is done by

    • Options
    • A. pans
    • B. wheel borrows
    • C. containers
    • D. pumps
    • E. belt conveyors.
    • Discuss
    • 3. The top diameter, bottom diameter and the height of a slump mould are :

    • Options
    • A. 10 cm, 20 cm, 30 cm
    • B. 10 cm, 30 cm, 20 cm
    • C. 20 cm, 10 cm, 30 cm
    • D. 20 cm, 30 cm, 10 cm
    • E. 30 cm, 20 cm, 10 cm
    • Discuss
    • 4. Pick up the correct statement from the following:

    • Options
    • A. An increase in water content must be accompanied by an increase in cement content
    • B. Angular and rough aggregates reduce the workability of the concrete
    • C. Large size aggregates increase the workability due to lesser surface area
    • D. The slump of the concrete mix decreases due to an increase in temperature
    • E. All the above.
    • Discuss
    • 5. Permissible compressive strength of M 150 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
    • 6. The operation of removing humps and hollows of uniform concrete surface, is known as

    • Options
    • A. floating
    • B. screeding
    • C. trowelling
    • D. finishing
    • E. none of these.
    • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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