RCC Questions (R1)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.



  1. Which of the following IS codes is used for Plain and Reinforced Concrete?


    1. IS 455: 1989
    2. IS 456: 2000
    3. IS 800: 2007
    4. IS 875: 1987

    View Answer
    Answer: b

  2. What is the minimum grade of concrete recommended for reinforced concrete work?


    1. M10
    2. M15
    3. M20
    4. M25

    View Answer
    Answer: c
    As per Table 5 of IS 456: 2000, the minimum grade of concrete to be used is M20.

  3. The strength of the material below which not more than 5% of the test results are expected to fall is called _______.


    1. Characteristic Strength
    2. Working Strength
    3. Flexural Strength
    4. None of the above

    View Answer
    Answer: a

  4. What is the total shrinkage strain of concrete?


    1. 0.003
    2. 0.0003
    3. 0.0035
    4. 0.002

    View Answer
    Answer: b
    As per IS 456:2000, cl 6.2.4.1, The total shrinkage strain for design may be taken as 0.0003.

  5. What is the flexural strength of M25 grade of concrete?


    1. 2.5 $N/mm^2$
    2. 3 $N/mm^2$
    3. 3.25 $N/mm^2$
    4. 3.5 $N/mm^2$

    View Answer
    Answer: d
    Flexural Strength $=0.7\sqrt{{f}_{ck}}$
    $=3.5 N/mm^2$

  6. Select the correct statement.


    1. Short term modulus of Elasticity of concrete is directly proportional to the characteristic strength of concrete
    2. Short term modulus of Elasticity of concrete is directly proportional to square root of the characteristic strength of concrete
    3. Short term modulus of Elasticity of concrete is inversely proportional to square root of the characteristic strength of concrete
    4. Short term modulus of Elasticity of concrete is not related to the characteristic strength of concrete

    View Answer
    Answer: b
    As per IS 456:2000, cl 6.3.2.1, Short-term modulus of elasticity of concrete is given by,
    ${E}_{c}=5000 \sqrt{{f}_{ck}}$

  7. Concrete surface exposed to seawater spray comes under which if the following environmental exposure condition?


    1. Moderate
    2. Severe
    3. Very severe
    4. Extreme

    View Answer
    Answer: c
    As per IS 456:2000 Table-3, this condition comes under very severe environment.

  8. What is the minimum grade of concrete to be used in RCC, when the surface is exposed directly along the sea coast?


    1. M20
    2. M25
    3. M30
    4. M35

    View Answer
    Answer: c
    As per IS 456, cl 8.2.8, M30 to be used for RCC and M20 to be used for PCC.

  9. For which grades Nominal mix may be used?


    1. M5 or lower
    2. M10 or lower
    3. M15 or lower
    4. M20 or lower

    View Answer
    Answer: d
    As per IS 456, Cl 9.1.1, for grades M20 or lower, the nominal mix may be used with the permission of Engineer-in-charge.

  10. What is the tolerance limit (in percent) for measuring equipment measuring cement and water?


    1. $\pm 3$ and $\pm 2$
    2. $\pm 2$ and $\pm 3$
    3. $\pm 2$ and $\pm 2$
    4. $\pm 3$ and $\pm 3$

    View Answer
    Answer: b
    As per IS 456, Cl 10.2.2, it is $\pm 2$ % and $\pm 3$ %.

  11. What is the minimum period to remove props to arches spanning over 6 m?


    1. 7 days
    2. 14 days
    3. 21 days
    4. 28 days

    View Answer
    Answer: c
    As per IS 456, Cl 11.3.1, it is 21 days.

  12. What is the maximum free fall of concrete?


    1. 0.5 m
    2. 1 m
    3. 1.5 m
    4. 2 m

    View Answer
    Answer: c
    As per IS 456, cl 13.2, the maximum free fall is 1.5 m

  13. What is the minimum of the radius of bent at construction joints, if HYSD bars are used?


    1. 6 times the diameter of the bar
    2. 4 times the diameter of the bar
    3. 3 times the diameter of the bar
    4. 5 times the diameter of the bar

    View Answer
    Answer: a
    As per IS 456, cl 12.5, 6 times the diameter of the bar for HYSD and 4 times the dia of the bar for plain mild steel bar.

  14. As per IS 456, what is the minimum time for which curing is to be done?


    1. 7 days
    2. 14 days
    3. 21 days
    4. 28 days

    View Answer
    Answer: a
    As per IS 456. cl 13.5, minimum time period is 7 days.

  15. The individual variation should not be more than ____ percent of the average test result.


    1. $\pm 5$
    2. $\pm 10$
    3. $\pm 12$
    4. $\pm 15$

    View Answer
    Answer: d
    As per IS 456, cl 15.4, it is $\pm 15$ percent.





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