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  • Question
  • 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.

  • Correct Answer
  • screed vibrator 


  • Concrete Technology problems


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

    • Options
    • A. Bulking of sand is caused due to formation of a thin film of surface moisture
    • B. Fine sand bulks more than coarse sand
    • C. With 10% moisture content by weight, the bulking of sand is increased by 50%.
    • D. The volume of fully saturated sand, is equal to the volume of dry and loose sand
    • E. All the above.
    • Discuss
    • 3. For a rectangular foundation of width b, eccentricity of load should not exceed

    • Options
    • A. b/2
    • B. b/3
    • C. b/4
    • D. b/5
    • E. b/6.
    • Discuss
    • 4. The type of pointing in which a V-shaped projection outside the wall surface, is provided, is called

    • Options
    • A. recessed pointing
    • B. weather pointing
    • C. V-pointing
    • D. tuck pointing.
    • Discuss
    • 5. The ceiling height of a building is

    • Options
    • A. between ceiling and ground level
    • B. between ceiling and floor level
    • C. upto roof above ground level
    • D. upto ceiling from the ground level.
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • Discuss
    • 10. 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


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