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  • Question
  • The grade of concrete not recommended by I.S. : 456, is


  • Options
  • A. M 100
  • B. M 200
  • C. M 300
  • D. M 400
  • E. M 500

  • Correct Answer
  • M 500 


  • Concrete Technology problems


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    • 1. For construction of structures in sea water, the cement generally preferred to, is

    • Options
    • A. Portland-pozzolana cement
    • B. quick setting cement
    • C. low heat Portland cement
    • D. rapid hardening cement
    • E. none of these.
    • Discuss
    • 2. Addition of pozzolana to cement

    • Options
    • A. decreases workability
    • B. increases strength
    • C. increases heat of hydration
    • D. decreases curing time
    • E. none of these.
    • Discuss
    • 3. Specified compressive strengh of concrete is obtained from cube tests at the end of

    • Options
    • A. 3 days
    • B. 7 days
    • C. 14 days
    • D. 21 days
    • E. 28 days.
    • Discuss
    • 4. For compacting plain concrete road surface of thickness less than 20 cm, we use

    • Options
    • A. internal vibrator
    • B. screed vibrator
    • C. form vibrator
    • D. none of these.
    • Discuss
    • 5. Pick up the correct statement from the following:

    • Options
    • A. The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
    • B. The total water is the free water and the amount actually absorbed by the aggregates
    • C. Neither (a) nor (b)
    • D. Both (a) and (b).
    • Discuss
    • 6. Segregation is responsible for

    • Options
    • A. honey-combed concrete
    • B. porous layers in concrete
    • C. surface scaling in concrete
    • D. sand streaks in concrete
    • E. all the above.
    • Discuss
    • 7. The final operation of finishing floors, is known as

    • Options
    • A. screeding
    • B. floating
    • C. trowelling
    • D. finishing
    • E. all the above.
    • Discuss
    • 8. The produce impermeable concrete

    • Options
    • A. thorough mixing of concrete is required
    • B. proper compaction of concrete is required
    • C. proper curing of concrete is required
    • D. properly graded and non-porous aggregates are requied
    • E. all the above.
    • Discuss
    • 9. According to the recommendations of IS : 456-1978, the expansion joints

    • Options
    • A. are provided where plane changes abruptly
    • B. are provided to ensure minimum resistance
    • C. are supported on separate columns
    • D. do not carry reinforcement across them
    • E. all the above.
    • Discuss
    • 10. The datum temperature for maturity by Plowman, is

    • Options
    • A. 23°C
    • B. 0°
    • C. - 5.6°C
    • D. - 11.7°C
    • Discuss


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