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Civil Engineering :: Concrete Technology and Design of Concrete Structures

  1. For the design of retaining walls, the minimum factor of safety against overturning is taken as

  2. A.

     1.5

    B.

     2.0

    C.

     2.5

    D.

     3.0

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  3. The minimum diameter of longitudinal bars in a column is

  4. A.

     6 mm

    B.

     8 mm

    C.

     12 mm

    D.

     16 mm

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  5. Maximum distance between expansion joints in structures as per IS : 456 – 1978 is

  6. A.

     20 m

    B.

     30 m

    C.

     45 m

    D.

     60 m

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  7. The fineness modulus of fine aggregate is in the range of

  8. A.

     2.0 to 3.5

    B.

     3.5 to 5.0

    C.

     5.0 to 7.0

    D.

     6.0 to 8.5

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

  10. A.

     0

    B.

     10

    C.

     20

    D.

     30

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

  12. A.

     20 kN/cm²

    B.

     200 kN/cm²

    C.

     200kN/mm²

    D.

     2xl06N/cm²

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

  14. A.

     compressive stress

    B.

     shear stress

    C.

     bond stress

    D.

     tensile stress

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

  16. A.

     1/4

    B.

     1/5

    C.

     1/6

    D.

     1/8

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  17. 1% of voids in a concrete mix would reduce its strength by about

  18. A.

     5%

    B.

     10 %

    C.

     15%

    D.

     20%

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

  20. A.

     10 to 15% more

    B.

     15 to 20% more

    C.

     20 to 25% more

    D.

     25 to 50% more

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