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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. If the storey height is equal to length of RCC wall, the percentage increase in strength is

  2. A.

     0

    B.

     10

    C.

     20

    D.

     30


  3. Modulus of elasticity of steel as per IS : 456-1978 shall be taken as

  4. A.

     20 kN/cm²

    B.

     200 kN/cm²

    C.

     200kN/mm²

    D.

     2xl06N/cm²


  5. The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone

  6. A.

     compressive stress

    B.

     shear stress

    C.

     bond stress

    D.

     tensile stress


  7. The ratio of the diameter of reinforcing bars and the slab thickness is

  8. A.

     1/4

    B.

     1/5

    C.

     1/6

    D.

     1/8


  9. 1% of voids in a concrete mix would reduce its strength by about

  10. A.

     5%

    B.

     10 %

    C.

     15%

    D.

     20%


  11. The strength of concrete after one year as compared to 28 days strength is about

  12. A.

     10 to 15% more

    B.

     15 to 20% more

    C.

     20 to 25% more

    D.

     25 to 50% more


  13. For a reinforced concrete section, the shape of shear stress diagram is

  14. A.

     wholly parabolic

    B.

     wholly rectangular

    C.

     parabolic above neutral axis and rectangular below neutral axis

    D.

     rectangular above neutral axis and parabolic below neutral axis


  15. In prestressed concrete

  16. A.

     forces of tension and compression change but lever arm remains unchanged

    B.

     forces of tension and compressions remain unchanged but lever arm changes with the moment

    C.

     both forces of tension and compres-sion as well as lever arm change

    D.

     both forces of tension and compres-sion as well as lever arm remain unchanged


  17. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

  18. A.

     Deflect downward

    B.

     Deflect upward

    C.

     Deflect downward or upward

    D.

     None of the above


  19. The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

  20. A.

     0.367 xu

    B.

     0.416 xu

    C.

     0.446 xu

    D.

     0.573 xu