Entry-level civil engineering interview Questions

Many of our viewers asked about entry-level civil engineering interview questions, So here we will provide the Top 25 best civil engineering questions with answers.

These questions are taken from a known recruiter and also referred from top websites like Examlabs. If you have any doubts regarding these questions, please comment below!

Entry-level civil engineering interview questions
fig 1. Entry-level civil engineering interview questions

Entry-level civil engineering interview questions:

Q1. What is the Unit Weight of concrete?
  The unit weight of concrete depends on the type of aggregates and the amount of voids. As per IS: 456-2000, The Unit weight of plain concrete or PCC is 24KN/m3 and Reinforced concrete or RCC is 25KN/m3.

Q2. What is the unit weight of Steel?
:-   The unit weight of Steel is given by 78.5KN/m3

Q3. What are the Nominal Concrete Mix proportions for various grades?
:- Important: M20-1:1.5:3, M7.5- 1:4:8,
        Less important: M5- 1:5:10 , M25- 1:1:2, M30-1:1:3 (Cement:Sand:aggregate)

Q4. What is ductility?
   Ductility is Known as the ability to deform under tensile stress

Q5. What are the types of a slump?

  • True Slump: After the test, the concrete is evenly spread and there is no disintegration in the shape of a slump.
  • Shear Slump: Here one side of the slump slides down the other is known as shear slump, it is formed by a lean concrete mix.
  • Collapse Slump: The slump fails or collapses due to excessive water, it is known as a collapse slump.
  • Zero Slump:  For very stiff and dry mixes, the sample doesn’t change it”s shape is known as zero slump.

Q6. What’s the difference between a one-way slab and a two-way slab?
A. One-way slab: Ratio of Longer Span to Shorter span is > 2 whereas; For two-way slab, the Ratio of Longer span to shorter span is <= 2

Q7. What do you mean by One storeyed, Two storeyed building?
   The building which has two floors is called a two-storeyed building.

Q8. What is a flat slab?
   The slab which is supported on columns (Flab slab don’t have beams)

Q9. What’s the height of each floor?
A.   3m

Q10. What is the slope of Staircase?
 As per IS 456, the slope or pitch of stairs should be between 25 degrees to 40 degrees.

Q11. What is a crank length in the slab?
     The crank length in Slab is 0.42 D. (Where D is Depth of Slab-Top cover-Bottom Cover) 

Q12. What do you mean by the moment of inertia?
      A quantity expressing a body’s tendency to resist angular acceleration, which is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.

Q13. What’s the length of rise and tread in the Staircase?
      Rise – 150mm to 200mm, Tread – 250mm to 300mm

Article: Entry-level civil engineering interview questions


Q14. What is the allowable moisture content in Fine aggregate for the concrete mix?
    We won’t use the aggregate if its moisture content is more than 5%

Q15. What do you mean by segregation?
    Segregation is a separation of cement, sand from aggregate. This is caused due to Water cement ratio and  when concrete is poured about more than 1.5m

Q16. What is grouting?
     Grout is a fluid form of concrete, which is used to fill the voids.

Q17. How do you check the quality of cement on the site?

A.     1. Date of Mfg: Cement strength decreases with its age.
         2. Color: Colour should be grey with a light greenish shade and it should be uniform. Color gives an indication of excess lime or clay.
         3. Float test: A good cement won’t float if you throw cement in water.
         4. When you put your hand in the cement bag you should feel cool.

Article: Entry-level civil engineering interview questions

Q18. What is Seepage?
     slow percolation of water through soil is called Seepage.

Q19. What is the Compressive Strength of brick?
      Second class brick-70kg/cm2
          First class brick-105kg/cm2
          Fire brick-125kg/cm2

Q20. 1BHK full form : 1 Bedroom, 1 Hall, 1kitchen

Q21. What is Initial & final setting time of concrete?
     Intial Setting time: 30mins, Final setting time: 10hrs

Q22. What is the durability?
Ability to withstand under pressure is called Durability.

Q23. What are the concrete tests?
Slump test, Compressive strength test, water permeability test, Water absorption test 

Q24. What is bleeding in concrete?
Bleeding is one form of segregation, where water comes out to the surface of the concrete,   being the lowest specific gravity among all the ingredients of concrete.

Q25. What is the name of the machine to get the compression test?
A.     universal testing machine (UTM)

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