RCC Questions (R4)

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



  1. The location of neutral axis in a T beam is ...


    1. in the web
    2. in the flange
    3. at the intersection of web and flange
    4. either (a) or (b) or (c)

    View Answer
    Answer: d

  2. If NA of a T beam lies within flange then ...


    1. the beam is designed as a rectangular beam
    2. the concrete area in the web will be ignored
    3. both (a) and (b)
    4. the beam is designed as a T beam

    View Answer
    Answer: c
    If NA lies within the depth of the flange than, the concrete below the NA can be ignored as it can not take tension and such T-beam is design as a rectangular beam of width equal to flange width.

  3. If roof slab and beam supporting it act monolithically then which of the following is correct.


    1. the beam is designed as T beam
    2. the beam is designed as a rectangular beam
    3. design of beam will depend upon the depth of NA
    4. none of the above

    View Answer
    Answer: c

  4. Which of the following is not an advantage of compression steel used in a doubly reinforced beam?


    1. it reduces the long-term deflection and increases the ductility of the beam.
    2. it makes the beam more economical than the singly reinforced beam.
    3. it permits the smaller size of the beam.
    4. it can be used as anchor bars.

    View Answer
    Answer: b
    In a doubly reinforced beam, compression steel is under stressed and hence they doubly reinforced beam is less economical than the singly reinforced beam.

  5. Consider the following statements and choose the correct option.


    1. failure of an under-reinforced beam is called compression failure.
    2. failure of an over reinforced beam is called tensile failure.

    1. both statements are correct
    2. both statements are wrong
    3. only statement (1) is correct
    4. only statement (2) is correct

    View Answer
    Answer: b
    failure of an under-reinforced beam is called tensile failure because under ultimate state the tension steel yields significantly before a strain of 0.0035 occurs in the concrete. This failure is also called ductile failure.
    failure of an over reinforced beam is called compression or brittle failure because concrete reaches the crushing strain and yielding of tensile steel is not significant.

  6. Select the incorrect statement.


    1. In an over reinforced section, the moment of resistance increases rapidly.
    2. In an under-reinforced section, the moment of resistance nearly proportional to the percentage of tension steel.
    3. The rate of gain of the moment of resistance increases with the use of higher grade of steel.
    4. In higher grade, steel balanced section is reached at a smaller percentage of steel.

    View Answer
    Answer: a

  7. What is the minimum percentage of mild steel provided in a slab?


    1. 0.12
    2. 0.15
    3. 0.18
    4. 0.20

    View Answer
    Answer: b
    As per IS 456, Cl 26.5.2.1, It is 0.15% for mild steel and 0.12 for HYSD bars.

  8. The maximum ratio of the total depth of the slab and diameter of steel bar is ...


    1. 4
    2. 6
    3. 7
    4. 8

    View Answer
    Answer: d
    As per IS 456, Cl 26.5.2.2, the Maximum diameter of steel bar in a slab can be 1/8th of the overall depth of the slab.

  9. Which of the following is the function(s) of transverse reinforcement in a slab?


    1. it distributes the effects of point load on the slab evenly and uniformly.
    2. it distributes the shrinkage and temperature cracks more evenly.
    3. it keeps the main reinforcement in position.
    4. all of the above.

    View Answer
    Answer: d

  10. What is the spacing between the main reinforcement in a slab?


    1. 3 times the effective depth of the slab
    2. 300 mm
    3. Smaller of the above two
    4. Greater of the first two options

    View Answer
    Answer: c
    As per IS 456, Cl 26.3.3 (b-1), it is 3 times the effective depth or 300 mm (whichever is smaller)

  11. What is the spacing between the main reinforcement in a slab?


    1. 5 times the effective depth of the slab
    2. 450 mm
    3. Smaller of the above two
    4. Greater of the first two options

    View Answer
    Answer: c
    As per IS 456, Cl 26.3.3 (b-2), it is 5 times the effective depth or 450 mm (whichever is smaller)

  12. Steel bars are bent up at a distance of _______ from the centre of the support in slabs.


    1. l/5
    2. l/6
    3. l/7
    4. l/8

    Where l is the centre to centre span

    View Answer
    Answer: c

  13. The triangular load on a lintel makes an angle of ____ on its base with the vertical.


    1. $30^\circ$
    2. $45^\circ$
    3. $60^\circ$
    4. $70^\circ$

    View Answer
    Answer: a

  14. There is slab over a lintel, intersecting the load dispersion triangle. The load acting on the lintel will be...


    1. load due to masonry between the lintel and the slab.
    2. self-weight of the slab of length equal to the length of the lintel.
    3. triangular load on the slab
    4. addition of the above

    View Answer
    Answer: d





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