IS codes are important for a civil engineer as they provide the client whose construction work is to be executed a form of assurance and security.All construction works are executed as per the reference of IS codes.Every country has its own codes that specifies the execution and quality of work.As a civil engineer, it is necessary to study Indian Standard (I.S) Codes by which execution of work will be as per the standard quality.
So here are some question that are mostly asked in an interview.If you are a fresher and going for an interview so you should remind these questions with answer that are as follows:-
Q1. What is the Tension and Compression zone in
Cantilever Beam?
Answer: In Cantilever Beam, the Tension zone is
located above the Neutral Axis and the Compression zone is located below the
Neutral Axis.
Q2. What is the Rolling Margin Tolerance for Nominal
mass for a 25 m diameter bar?
Answer: As per IS 1786, the Rolling Margin Tolerance
for Nominal mass for 25 m diameter bar is ±3 %.
Q3. What is the Standard Length of Steel Bar taken
for Rolling Margin?
Answer: The Standard Length of Steel Bar taken for
Rolling Margin at Construction site is 1 metre.
Q4. Which grade of concrete is considered as HSC
(High Strength Concrete)?
Answer: As per IS 456: 2000 [Table – 2], the grade
of concrete considered as HSC (High Strength Concrete) is M65, M70, M75, M80,
M85, M90, M95, and M100.
Q5. What is the number of concrete cube samples
taken for 6-15 cubic meter concrete?
Answer: As per IS 456: 2000 [Clause – 15.2.2], the number of concrete cube samples taken for 6-15 cubic meter concrete is 2, which consists of 6 concrete cubes.
[NOTE: 1 samples = 3 test specimens = 3 concrete
cube]
Q6. What is the reference IS code used for the Bend
Test of a Steel bar?
Answer: The reference IS code used for the Bend Test of a Steel bar is IS 1599.
Q7. What is the angle for the Bending of steel bar for the Bend test?
Answer: As per IS 1599, the angle for the Bending of
steel bar for the Bend test is 180 degrees.
Q8. What is the allowable maximum percentage of
Carbon in the manufacturing of TMT (Thermo Mechanically Treated) Bar?
Answer: As per [IS 1786, Clause- 3.2], the allowable
maximum percentage of Carbon in the manufacturing of TMT (Thermo Mechanically Treated)
Bar is 0.25 %.
Q9. What is the diameter of the Mandrel used for the
Bend Test of Fe 500 for diameter 20 mm?
Answer: As per IS 1786, the diameter of the Mandrel
used for the Bend Test of Fe 500 for diameter 20 mm is 4Φ, where Φ is the
diameter of the bar.
Q10. What is the full form of ‘BOQ’?
Answer: The full form of ‘BOQ’ is Bill of Quantities.
Q11. What is Fine Aggregate?
Answer: As per IS 383, Aggregate most of which passes
4.75 mm IS Sieve.
Q12. What is Coarse Aggregate?
Answer: As per IS 383, Aggregate most of which
retained on 4.75 mm IS Sieve.
Q13. What is the minimum curing period for Super
Sulphate Cement?
Answer: The minimum curing period for Super Sulphate
Cement is 7 days.
Q14. What is the maximum and minimum tolerance for
concrete cube characteristics compressive strength result?
Answer: As per IS 456: 2000 [Clause – 15.4], the maximum and minimum tolerance for concrete cube characteristics compressive strength result is +15% and -15%.
Q15. What is All-in-Aggregate?
Answer: As per IS 383, Material composed of both
fine aggregate and coarse aggregate is known as All-in-Aggregate.
Q16. What is Anchorage Length?
Answer: As per IS Code 13920: 2016, Clause – 6.2.5,
Anchorage length equals to development length of the bar in tension and plus 10
times bar diameter minus the allowance for 90 degrees bend.
Q17. What is the maximum percentage dosage of
retarder we can use?
Answer: As per IS 456: 2000 [Clause – 10.3.3], the
maximum percentage dosage of retarder we can use is 0.5 percent by weight of
cementitious materials.
Q18. What is the minimum quantity of cement required
for M25 grade of concrete for Moderate condition?
Answer: As per IS 456: 2000 [Table-5], the minimum
quantity of cement required for M25 grade of concrete for Moderate condition is
300 kg/㎥
Q19. What is the maximum quantity of cement we can use
per cubic meter of concrete?
Answer: As per IS 456: 2000 [Clause – 8.2.4.2], the maximum quantity of cement we can use per cubic meter of concrete is 450 kg. Cement content not including fly ash and ground granulated blast furnace slag in excess of 450 kg/㎥ should not be used unless special consideration has been given in the design to the increased risk of cracking due to drying shrinkage in thin sections, or to early thermal cracking and to the increased risk of damage due to alkali-silica reactions
Q20. What is the Effective depth of beam?
Answer: As per IS 456: 2000 [Clause – 23], Effective
depth of a beam is the distance between the centroid of the area of tension
reinforcement and the maximum compression fiber, excluding the thickness of
finishing material not placed monolithically with the member and the thickness
of any concrete provided to allow for wear. This will not apply to deep beams.
Q21. Which grade of concrete termed as Nominal Mix
Design?
Answer: As per IS 456: 2000 [Clause – 9.3], Nominal
Mix Concrete may be used for concrete of M20 or Lower.
Q22. Which IS code specified for Mandrel diameter
for Bend and Rebend test?
Answer: The IS code specified for Mandrel diameter
for Bend and Rebend test is IS 1786.
Q23. What is the minimum curing period required when
we use blended cement in construction?
Answer: As per IS 456: 2000 [Clause – 13.5.1], the
minimum curing period required when we use mineral admixtures or blended cement
in construction is 10 days.
Q24. What is the angle for the Bending of steel bar
for the Rebend test?
Answer: For the Rebend test, Initially bend the bar
to an included angle of 135 degrees. Keep it in boiling water at 100 degrees
for 30 minutes. Then cool it down for some time. After cooling bent it back to
an included angle of 157.5 degrees.
Q25. What is the maximum percentage dosage of
plasticizers we can use?
Answer: As per IS 456: 2000 [Clause – 10.3.3], the
maximum percentage dosage of plasticizers we can use is 1.0 percent by weight
of cementitious materials.
Q26. What is the standard Diameter of Tremie Pipe?
Answer: As per IS 456: 2000 [Clause – 14.2.4(a)],
The tremie pipe shall be not less than 200 mm in diameter and shall be large
enough to allow a free flow of concrete and strong enough to withstand the
external pressure of the water in which it is suspended, even if a partial
vacuum develops inside the pipe.
Q27. What should be the spacing considered when we
use coupler in a longitudinal reinforcement bar?
Answer: As per IS Code 13920: 2016, Clause – 6.2.6.2
(b), The spacing between adjacent longitudinal bars shall be based also on the
outer size of the coupler to allow easy flow of concrete.
Q28. What is the Slump value for Pumped concrete?
Answer: As per IS 456: 2000 [Clause – 7.1], the
Slump value for Pumped concrete is (75 – 100) mm.
Q29. What is the allowable tolerance for Concrete
Cover size?
Answer: As per IS 456: 2000 [Clause – 12.3.2], the
Actual concrete cover should not deviate from the required nominal cover by +10
mm and -0 mm.
Q30. Which is the most important IS code for a Civil
Engineer?
Answer: IS 456 gives specifications about plain
reinforcement concrete. For designing any concrete structure, this IS code is
important.
Give your positive feedback and suggest more points that are asked in an interview in comment section below. - Civil Engineering Realities
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