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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. Examine the following statements :
    i) Factor of safety for steel should be based on its yield stress,
    ii) Factor of safety for steel should be based on its ultimate stress,
    iii) Factor of safety for concrete should be based on its yield stress,
    iv) Factor of safety for concrete should be based on its ultimate stress.
    The correct statements are

  2. A.

     (i) and (iii)

    B.

     (i) and (iv)

    C.

     (ii) and (iii)

    D.

     (ii) and (iv)


  3. Strength of concrete increases with

  4. A.

     increase in water-cement ratio

    B.

     increase in fineness of cement

    C.

     decrease in curing time

    D.

     decrease in size of aggregate


  5. In counterfort retaining walls, the main reinforcement in the stem at support is

  6. A.

     Not provided

    B.

     Provided only on inner face

    C.

     Provided only on front face

    D.

     Provided both on inner and front faces


  7. Assertion A : The load factor for live load is greater than that for dead load.
    Reason R : The live loads are more uncertain than dead loads.
    Select your answer based on the coding system given below :

  8. A.

     Both A and R are true and R is the correct explanation of A.

    B.

     Both A and R are true but R is not the correct explanation of A.

    C.

     A is true but R is false.

    D.

     A is false but R is true.


  9. Diagonal tension in a beam

  10. A.

     Is maximum at neutral axis

    B.

     Decreases below the neutral axis and increases above the neutral axis

    C.

     Increases below the neutral axis and decreases above the neutral axis

    D.

     Remains same


  11. According to IS : 456-1978, the fiexural strength of concrete is

  12. A.

     directly proportional to compressive strength

    B.

     inversely proportional to compressive strength

    C.

     directly proportional to square root of compressive strength

    D.

     inversely proportional to square root of compressive strength


  13. The factor of safety for

  14. A.

     steel and concrete are same

    B.

     steel is lower than that for concrete

    C.

     steel is higher than that for concrete

    D.

     none of the above


  15. The design yield stress of steel according to IS: 456-1978 is (where fy is the characteristic yield strength of steel)

  16. A.

     0.37 fy

    B.

     0.57 fy

    C.

     0.67 fy

    D.

     0.87 fy


  17. Which of the following statements is incorrect ?

  18. A.

     Higher Vee-Bee time shows lower workability.

    B.

     Higher slump shows higher workability.

    C.

     Higher compacting factor shows higher workability.

    D.

     none of the above


  19. The approximate value of the ratio between direct tensile strength and flexural strength is

  20. A.

     0.33

    B.

     0.5

    C.

     0.75

    D.

     1.0