civil question answer for interview
Question.1. How do you measure the volume of concrete ?
Answer. The volume of concrete is calculated by Multiplying its Length, Width, and Thickness together.
For Example - 1m ✕1m ✕1m
Question.2. Why concrete cover block is provided to reinforcement ?
Answer. Concrete cover block for reinforcement is required to protect the rebar against corrosion and to provide resistance against fire.
Question.3. What are the steps involved in building ?
Answer. 1. Excavation
2. PPC
3. Footing Foundation
4. Plinth Beam
5. Earth filling in Plinth
6. DPC
7. Column Construction
8. Brick Wall Construction
9. Stair Casting
10. Beam and Slab Casting
11. Lintel and Chhajja
12. Flooring
13. Plastering
14. Pointing & Finishing
15. Electrical Fittings
16. Plumbing Fittings
17. Painting W
Question.4. What is initial setting time for cement ?
Answer. 30 min
Question.5. final setting time of opc Cement is ?
Answer. 10 hours
Question.6. What is the minimum nos of bar for a rectangular Column ?
Answer. 4 nos
Question.7. What is minimum nos of bar for circular Column ?
Answer. 6 nos
Question.8. What is the standard size of concrete cube ?
Answer. 150 x 150 x 150 mm
Question.9. How much layer needs to fill a Concrete cube for testing ?
Answer. 3 layers
Question.10. How much layer needs to fill a Slump for Slump Test ?
Answer. 4 layers
Question.11. What is the validity of use of Cement ?
Answer. it is 3 months from manufacturing.
Question.12. For which test Universal Testing Machine is used ?
Answer. tensile test of reinforcement.
Question.13. What is the minimum curing period for Concrete ?
Answer. in normal weather , it is seven days.
for dry or hot weather , it is 10 days.
Question.14. What is deflection ?
Answer. deflection means temporary displacement .
Question.15. What is deformation ?
Answer. deformation is a permanent displacement.
Question.16. What is the formula for tensile strength of Concrete ?
Answer. 0.7√fck
Question.17. Which grade of Concrete are called Ordinary Concrete ?
Answer. M10 to M20 Concrete are Ordinary Concrete.
Question.18. Which grade of Concrete are called Standard Concrete ?
Answer. M25 to M 35
Question.19. Which grade of Concrete are called high strength Concrete ?
Answer. M60 to M80
Question.20. How much time required to mix Concrete in a Mixture Machine.
Answer. Minimum 2-3 min needs to mix Concrete in a Mixture Machine .
Question.21. Which diameter of bar should be used for chairs ?
Answer. Minimum 12 mm dia bar .
Question.22. What is the minimum cover for footing , column , slab and beam ?
Answer. Minimum cover should be : 50mm (footing) , 40mm (column) , 20 mm (slab) , 25 mm (beam)
Q.23. What is the ratio of most used cement concrete M10, M15, M20, M25 ?
Ans. For M10 (1:3:6) , M15 (1:2:4) , M20 (1:1.5:3) , M25 (1:1:2)
The ratio is like Cement : Sand : Aggregates.
Q.24. What is the full form of DPR ?
Q.25. How much water absorption is allowed for brick ?
Ans. not more than 20%
Q.26. What is the weight of one bag Cement?
Ans. 50 Kg
Q.27. What is the Height of a Single Storey Building ?
Ans. 3.15 m
Q.28. What is the volume of one bag (50 kg) Cement ?
Ans. 0.035 cum or 1.23 cubic feet .
Q.29. How to do check level on construction site ?
Ans. I will check the level on construction site by Spirit level, Dumpy Level and Leveling Pipe.
Q.30. What is the accuracy of the dumpy level or minimum reading we can take ?
Ans. With the help of a dumpy level we can take up 5mm accurate reading or minimum reading.Q.31. How do you Calculate Unit Weight Steel Bars on-site ?
Ans. Unit Weight of Steel bars can be calculated by using formula,
= D² / 162
Q.32. How do you Calculate Weight of 10mm dia. And 12 m length Steel Bars on-site ?
Ans. By Multiplying Unit Weight of 10 mm dia. Steel with Length,
Weight = Unit Weight ✕ Length
= (D² / 162) ✕ 12
= (10² / 162) ✕ 12
= 0.617 ✕ 12
= 7.40 kg
Q.33. What will you do if a concrete cube fails the 28-day compressive strength test?
Ans. If the concrete cube fails the strength test, I will do the core cutter test on the concrete and send a report to the higher authorities.
Q.34. What is the mix ratio for m-20 Grade of concrete ?
Q.35. What is the Density of Steel ?
Q.36. In Fe-415 Steel Grade, 415 indicates the of Steel.
Q.37. The Slope of Stair Should not Exceed.
Q.38 Minimum diameter of main steel bar in column.
Q.39. Standard Size of brick ?
Q.40. What is Unit Weight of RCC ?
Q.41. What is the full form of UTM ?
Q.42. What is unit weight of 25mm steel bars ?
Q.43. One Gallon = Liters.
Q.44. One kilonewton is equal to kilograms.
Q.45. One Ton is equal to kilograms.
Q.46. Maximum free fall of concrete allowed is ?
Q.47. What is the full form of AAC ?
Q.48. What is the full form of NDT ?
Q.49. What is the full form of JCB ?
Q.50. Which test is conducted to determine the bearing capacity of soil ?
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