Floating Concrete II Year

15 Questions | Total Attempts: 115

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Floating Concrete II Year


Questions and Answers
  • 1. 
    The aggregate in which particle of all sizes are present in various proportions is called
    • A. 

      Graded aggregate

    • B. 

      All-in-aggregate

    • C. 

      Single size aggregate

    • D. 

      None of these

  • 2. 
    The aggregate in which majority of particles are one and same size is called
    • A. 

      Graded aggregate

    • B. 

      All-in-aggregate

    • C. 

      Continuous aggregate

    • D. 

      None of these

  • 3. 
    The maximum size of coarse aggregate for the concrete in a column of size 400 x 400 mm should be
    • A. 

      40 mm

    • B. 

      35 mm

    • C. 

      25 mm

    • D. 

      20 mm

  • 4. 
    As the size of coarse aggregate decreases, the workability of concrete
    • A. 

      Decreases

    • B. 

      Increases

    • C. 

      First increases then decreases

    • D. 

      First decreases then increases

  • 5. 
    Shape of crushed rocks is
    • A. 

      Rounded

    • B. 

      Irregular

    • C. 

      Flaky

    • D. 

      Angular

  • 6. 
    The shape of  laminated rock is
    • A. 

      Rounded

    • B. 

      Flaky

    • C. 

      Irregular

    • D. 

      Angular

  • 7. 
    River gravel is
    • A. 

      Flaky

    • B. 

      Irregular

    • C. 

      Angular

    • D. 

      Rounded

  • 8. 
    Following shape of particle is not desirable in aggregate
    • A. 

      Rounded

    • B. 

      Irregular

    • C. 

      Angular

    • D. 

      Flaky

  • 9. 
    Flaky shape is not desirable because it has 
    • A. 

      Lowest surface area for given volume

    • B. 

      Highest surface area for given volume

    • C. 

      Lowest perimeter for a given volume

    • D. 

      None of these

  • 10. 
    Flaky particle in aggregate
    • A. 

      Reduces workability

    • B. 

      Reduces durability

    • C. 

      Hardened concrete looks like a stratified rock

    • D. 

      All of these

  • 11. 
    The percentage of tricalcium aluminates in sulphate resisting cement is
    • A. 

      More than 6%

    • B. 

      Less than 6%

    • C. 

      More than 16%

    • D. 

      Less than 16%

  • 12. 
    Sulphate resisting cement is useful in structures
    • A. 

      In river waters

    • B. 

      Sea waters

    • C. 

      In cold environment

    • D. 

      In hot environment

  • 13. 
    Portland blast furnace slag cement can be used 
    • A. 

      In under water structures

    • B. 

      In structures in alkaline soils

    • C. 

      In all places where ordinary Portland cement is used

    • D. 

      All of these

  • 14. 
    Slag from blast furnace contains
    • A. 

      Alumina

    • B. 

      Lime

    • C. 

      Silica

    • D. 

      All of these

  • 15. 
    Blast furnace slag has approximately
    • A. 

      45% calcium oxide and about 35% silica

    • B. 

      50% alumina and 20% calcium oxide

    • C. 

      25% magnesia and 15% silica

    • D. 

      25% calcium sulphate and 15% alumina

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