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INTERVIEW QUESTIONS

500 Civil Engineering Interview Questions and Answers Part -1

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1. General Civil Engineering Questions

  1. What is civil engineering?
    • Civil engineering is a branch of engineering that deals with designing, constructing, and maintaining structures like buildings, roads, bridges, and water supply systems.
  2. What are the main branches of civil engineering?
    • Structural Engineering
    • Geotechnical Engineering
    • Transportation Engineering
    • Water Resources Engineering
    • Construction Management
    • Environmental Engineering
  3. What is the density of steel?
    • The density of steel is 7850 kg/m³.
  4. What is the standard weight of an RCC slab per square meter?
    • It ranges between 240 kg/m² to 300 kg/m², depending on the thickness.
  5. What is the modulus of elasticity of concrete?
    • 5000√fck MPa, where fck is the characteristic compressive strength.
  6. What is the role of reinforcement in concrete?
    • It provides tensile strength, as concrete is weak in tension.
  7. What is creep in concrete?
    • Creep is the gradual deformation of concrete under sustained load over time.
  8. What is shrinkage in concrete?
    • Shrinkage is the reduction in volume of concrete due to water evaporation.
  9. What are the common types of loads acting on a structure?
    • Dead Load
    • Live Load
    • Wind Load
    • Earthquake Load
    • Snow Load
  10. What is the standard size of a brick in India?
  • 190mm × 90mm × 90mm

2. Concrete Technology Questions

  1. What are the different grades of concrete?
  • M10 (10 MPa), M15, M20, M25, M30, M35, M40, M50, etc.
  1. What is the standard water-cement ratio for M20 concrete?
  • 0.45 to 0.50
  1. What is a slump test?
  • A test to measure the workability of fresh concrete.
  1. What is the minimum grade of concrete for RCC?
  • M20 (1:1.5:3 mix ratio)
  1. What is the initial and final setting time of cement?
  • Initial setting time: 30 minutes
  • Final setting time: 10 hours
  1. What is the function of admixtures in concrete?
  • They modify properties like workability, setting time, and durability.
  1. What is the compressive strength of M20 concrete after 28 days?
  • 20 MPa (N/mm²)
  1. What is the role of fly ash in concrete?
  • Improves workability, reduces heat of hydration, and increases durability.
  1. What is the difference between OPC and PPC cement?
  • OPC (Ordinary Portland Cement) has faster strength gain.
  • PPC (Portland Pozzolana Cement) has better durability and resistance.
  1. What is the minimum curing period for concrete?
  • 7 days for OPC and 14 days for PPC.

3. Structural Engineering Questions

  1. What is a simply supported beam?
  • A beam supported at both ends without a fixed restraint.
  1. What is a cantilever beam?
  • A beam that is fixed at one end and free at the other.
  1. What is the standard size of a column in a residential building?
  • 230mm × 230mm for single-story, 300mm × 300mm for multi-story.
  1. What is a two-way slab?
  • A slab where load is distributed in both directions, supported on all four sides.
  1. What is the reinforcement percentage in RCC slabs?
  • 0.7% to 1% of the total cross-sectional area.
  1. What is the lapping length for reinforcement bars?
  • 40D for tension bars, 50D for compression bars (D = bar diameter).
  1. What is the standard cover for reinforcement in slabs?
  • 20mm for slabs, 25mm for beams, 40mm for columns.
  1. What is the formula for bending moment?
  • M = F × d (Force × Distance)
  1. What is the maximum span for a slab without beams?
  • Up to 6m (for flat slabs with reinforcement).
  1. What is the permissible deflection limit in RCC beams?
  • Span/250 for total deflection.

4. Surveying Questions

  1. What is a total station?
  • A surveying instrument that measures angles and distances digitally.
  1. What is a benchmark in surveying?
  • A fixed reference point of known elevation.
  1. What is the least count of a theodolite?
  • 20 seconds or 1 minute.
  1. What is levelling in surveying?
  • Measuring height differences between points.
  1. What is contouring?
  • Representing elevation changes on a map.
  1. What is the principle of chain surveying?
  • Triangulation, where measurements form triangles for accuracy.
  1. What is the function of a plumb bob?
  • Used to check vertical alignment.
  1. What is a prismatic compass used for?
  • Measuring horizontal angles and directions.
  1. What is an EDM (Electronic Distance Measurement) instrument?
  • A device used for precise distance measurement.
  1. What is the importance of a total station?

It combines theodolite, EDM, and data recording for accurate surveying.