RCC Questions (R3)

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



  1. As per IS 456, Which of the following is the ratio to limit the vertical deflection of a simply supported beam?


    1. 7
    2. 20
    3. 26
    4. no such limit

    View Answer
    Answer: b
    As per IS 456 Cl 23.2.3, the ratio of span to effective depth for a simply supported beam is 20.

  2. If the span of a simply supported beam is 12, then what will be its effective depth?


    1. 1.7 m
    2. 0.6 m
    3. 0.72 m
    4. 0.462 m

    View Answer
    Answer: c
    Since the span is over 10m, the ratio for simply supported beam (20) will be modified by a factor "20/(span in meter)"
    $\frac{12}{\text{effective depth}}=20 \times \frac{10}{12}$
    $\text{effective depth}=0.72 m$

  3. The deflection including the effects of temperature, creep and shrinkage occurring after the erection of partitions and the application of finishes should not exceed _______.


    1. span/350
    2. 20 mm
    3. span/250
    4. lesser of (a) and (b)

    View Answer
    Answer: d
    As per IS:456, Cl 23.2 (b), it is lesser of span/350 and 20 mm.

  4. The effective depth and width of a cantilever beam are 380 mm and 200 mm. What should be the maximum clear span so that the beam stays laterally stable?


    1. 5 m
    2. 10.5 m
    3. 12 m
    4. 7 m

    View Answer
    Answer: a
    As per IS: 456, Cl 23.3, a cantilever is laterally stable if its clear span does not exceed $25 \times width$ or $100 {b^2}/d$ whichever is less

  5. Which of the following slabs is a one-way slab?


    1. 10 m X 15 m
    2. 15 m X 30 m
    3. 4 m X 7 m
    4. 8 m X 3 m

    View Answer
    Answer: d
    One-way slabs are those slabs in which ratio of longer span to shorter span is greater than 2.

  6. What is the span to overall depth ratio for the two-way simply supported slab reinforced with HYSD bars?


    1. 28
    2. 35
    3. 40
    4. 32

    View Answer
    Answer: a
    As per IS: 456 Cl 24.1 (Note-2), Ratio is 35 and if HYSD bar is used the ratio is multiplied by 0.8.

  7. What is the maximum reinforcement allowed in compression zone of a beam?


    1. $0.04 \times bD$
    2. $0.04 \times bd$
    3. $0.01 \times bD$
    4. $0.01 \times bd$

    Where, b,d and D are the width, effective depth and overall depth of a beam

    View Answer
    Answer: a
    As per IS: 456 Cl 26.5.1.2, it is $0.04 \times bD$

  8. The width of a beam is 250 mm and exposure condition is mild. If 600 $mm^2$ reinforcement is to be provided using 16 mm bars then what will be the centre to centre spacing between the steel bars?


    1. 102 mm
    2. 97 mm
    3. 92 mm
    4. 88 mm

    View Answer
    Answer: b
    Since the exposure condition is "mild", the nominal cover as per IS:456 Table 16 is 20 mm
    Number of bars required is 3
    C/C distance $=\frac{250- 2\times 20 -2\times 8}{2} = 97 mm$

  9. What is the maximum limit on lateral sway under transient wind load?


    1. H/350
    2. H/400
    3. H/450
    4. H/500
    Where H is the total height of the building.


    View Answer
    Answer: d
    As per IS:456, cl 20.5, limit to lateral sway is H/500

  10. What is the effective span for an intermediate span?


    1. The clear span between supports
    2. The clear span between supports plus the effective depth of the beam/slab
    3. The clear span between supports plus width of the support
    4. Lesser of (b) and (c)

    View Answer
    Answer: a
    As per IS:456, Cl 22.2 (b1), for continuous spans, For end span with one end fixed and the other continuous or for intermediate spans, the effective span shall be the clear span between supports.

  11. Which of the following is correct regarding Flanged Beam?


    1. The slab shall be cast integrally with the web, or the web and the slab shall be effectively bonded together in any other manner.
    2. If the main reinforcement of the slab is parallel to the beam, transverse reinforcement shall be provided, such reinforcement shall not be less than 50 percent of the main reinforcement mid-span of the slab.
    3. Both (a) and (b)
    4. Neither (a) nor (b)

    View Answer
    Answer: a
    As per IS:456, Cl 23.1.1, The slab shall be cast integrally with the web, or the web and the slab shall be effectively bonded together in any other manner.
    If the main reinforcement of the slab is parallel to the beam, transverse reinforcement shall be provided, such reinforcement shall not be less than 60 per cent of the main reinforcement mid-span of the slab.

  12. For heavy load condition, what may be the overall depth of a continuous T-beam?


    1. 1/12 to 1/15 of the span
    2. 1/15 to 1/20 of the span
    3. 1/10 to 1/12 of the span
    4. 1/8 to 1/12 of the span

    View Answer
    Answer: c
    For light loads = 1/15 to 1/20 of the span
    For medium loads = 1/12 to 1/15 of the span
    For heavy loads = 1/10 to 1/12 of the span

  13. An isolated T-beam has a flange width of 1 m, flange thickness 80 mm rib width of 240 mm and effective depth of 400 mm, simply supported over a span of 4m. What is the effective width of the flange?


    1. 1000 mm
    2. 940 mm
    3. 850 mm
    4. 740 mm

    View Answer
    Answer: d
    Effective width of flange is given by,
    ${b}_{f}=\frac{{l}_{0}}{\frac{{l}_{0}}{b}+4}+{b}_{w}$
    ${b}_{f}=\frac{4000}{\frac{4000}{1000}+4}+{240}=740 mm$

  14. What is the depth of the neutral axis of a beam of effective depth 400 mm and width of 250 mm? Area of steel is 600 $mm^2$ $m=19$.


    1. 240 mm
    2. 242 mm
    3. 243 mm
    4. 244 mm

    View Answer
    Answer: b
    $\frac{b\times x^2}{2}=m\times{A}_{st}(d-x)$





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