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  • Question
  • The bulk density of aggregates, is generally expressed as


  • Options
  • A. tonnes/cubic metre
  • B. kg/cubic metre
  • C. kg/litre
  • D. g/cm3
  • E. none of these.

  • Correct Answer
  • kg/litre 


  • Concrete Technology problems


    Search Results


    • 1. Slump test of concrete is a meausre ofits

    • Options
    • A. consistency
    • B. compressive strength
    • C. tensile strength
    • D. impact value.
    • Discuss
    • 2. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is

    • Options
    • A. 100 kg/cm2
    • B. 150 kg/cm2
    • C. 200 kg/cm2
    • D. 250 kg/cm2
    • E. 300 kg/cm2
    • Discuss
    • 3. The type of aggregates of same nominal size, which contain less voids when compacted, are

    • Options
    • A. rounded spherical
    • B. irregular
    • C. flaky
    • D. none of these.
    • Discuss
    • 4. High temperature

    • Options
    • A. increases the strength of concrete
    • B. decreases the strength of concrete
    • C. has no effect on the strength of concrete
    • D. none of these.
    • Discuss
    • 5. For preparing a test-specimen, it is necessary

    • Options
    • A. to mix cement and fine aggregate by dry hand
    • B. to mix coarse aggregates
    • C. to mix water to the cement, fine aggregates and coarse aggregates
    • D. to oil inner surface of the mould and the base plate, before placing concrete
    • E. all the above.
    • Discuss
    • 6. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is

    • Options
    • A. 15, 900 litres
    • B. 16, 900 litres
    • C. 17, 900 litres
    • D. 18, 900 litres
    • Discuss
    • 7. Joints in concrete structures, are provided

    • Options
    • A. to reduce the tensile stresses likely to be developed due to evaporation of water
    • B. to minimise the change in the dimensions of the slab
    • C. to minimise the necessary cracking
    • D. all the above.
    • Discuss
    • 8. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than

    • Options
    • A. 30 minutes
    • B. 40 minutes
    • C. 60 minutes
    • D. 75 minutes
    • E. 90 minutes.
    • Discuss
    • 9. If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is

    • Options
    • A. 10%
    • B. 12.5%
    • C. 15%
    • D. 18.5 %
    • E. 20%
    • Discuss
    • 10. Ordinary Portland cement is manufactured from

    • Options
    • A. lime stone and clay
    • B. gypsum and lime
    • C. pozzolana
    • D. lime, pozzolana and clay.
    • Discuss


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