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Civil Engineering :: Concrete Technology

  1. Permissible compressive strength of M 150 concrete grade is

  2. A.

    100 kg/cm2

    B.

    150 kg/cm2

    C.

    200 kg/cm2

    D.

    250 kg/cm2

    E.

    300 kg/cm2


  3. Slump test of concrete is a measure ofits

  4. A.

    consistency

    B.

    compressive strength

    C.

    tensile strength

    D.
    impact value.

  5. Pozzolana cement is used with confidence for construction of

  6. A.

    dams

    B.

    massive foundations

    C.

    abutments

    D.

    R.C.C. structures

    E.

    all the above.


  7. Water cement ratio is

  8. A.

    volume of water to that of cement

    B.

    weight of water to that of cement

    C.

    weight of concrete to that of water

    D.

    volume of concrete to that of water

    E.

    both (a) and (b) of the above.


  9. Efflorescence in cement is caused due to an excess of

  10. A.

    alumina

    B.

    iron oxide

    C.
    silica
    D.
    alkalis
    E.

    magnesium oxide.


  11. 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

  12. A.

    10 cm

    B.

    15 cm

    C.

    20 cm

    D.

    25 cm

    E.

    30 cm


  13. The diameter of the Vicat plunger is 10 mm and its length varies from

  14. A.

    20 mm to 30 mm

    B.

    30 mm to 40 mm

    C.

    40 mm to 50 mm

    D.
    50 mm to 60 mm
    E.

    none of these.


  15. The shrinkage of concrete

  16. A.

    is proportional to water content is the mix

    B.

    is proportional to cement concrete

    C.

    increases with age of concrete

    D.

    all the above.


  17. The ratio of various ingredients (cement, sand, aggregates) in concrete of grade M 200, is

  18. A.

    1 : 2 : 4

    B.
    1 : 3 : 6
    C.

    1 : 1\(\frac { 1 } { 2 } \) : 3

    D.

    1 : 1 : 2

    E.

    4 : 2 : 1


  19. Separation of water or water sand cement from a freshly concrete, is known

  20. A.
    bleeding
    B.

    creeping

    C.

    segregation

    D.
    flooding
    E.

    none of these.