Civil EngineeringQC/ QS Engineering

Civil Engineering Interview Questions and Answers

Civil Engineering Interview Questions and Answers

Hello Civil Engineers, U are on this page because u are attending an interview tomorrow or preparing yourself to face an interview. Well, I m posting the Top interview questions asked by top recruiters from Top MNCs to small construction Companies. To gather this questions, I have referred top web-sites and asked my friends regarding this and gathered these questions. While some of them are easy and some of them is very hard still I m trying to crack those Questions and Answers as a part of 1st step.

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1. What is the Unit Weight of Concrete ?

The unit weight of Concrete depends on the type of aggregates and amount of voids. As per IS : 456-200 Unit weight of PCC is 24KN/m3 and RCC is 25KN/m3

2. What is the unit weight of Steel ?

The unit weight of Steel is 78.5KN/m3

3. What are the Nominal Concrete Mix proportions for different grades ?

M20 – 1 : 1.5 : 3

M7.5 – 1 : 4 : 8

M5 – 1 : 5 : 10

M25 – 1 : 1 : 2

M30 – 1 : 1 : 3

All in ratio of Cement : Sand : Aggregate

4. What is ductility ?

Ductility is the Ability to deform under tensile stress.

5. What’s the difference between one-way slab and two-way slab ?

One way slab: Ratio of Longer Span / Shorter span > 2
Two way slab: Ratio of Longer span/ shorter span <= 2

6. 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

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7. What is Seepage ?

Slow percolation of water through soil is called Seepage.

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

  1. Date of Mfg: Cement strength decreases with its age.
  2. Color: Colour should be grey with 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 a cement in water.
  4. When you put your hand in cement bag you should feel cool.

6. What is Initial and final setting time of concrete ?

Initial Setting time : 30mins

Final setting time : 10hrs

7. What is durability ?

Ability to withstand under pressure is called Durability.

8. What are the concrete tests ?

Slump test

Compressive strength test

Water permeability test

Water absorption test

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9. What is bleeding in concrete ?

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

10. What is the density of steel ?

    The density of steel is 7850 Kg / m3.

11. What is unit weight of cement ?  

    The unit weight of cement is 145 lb / ft3.

12. Please tell us about beam ?

Beam is a structural member used to resist the applied load. Generally, beam is used to resist the shear force, vertical load and bending moment. Beam is horizontal element which is imposed on end points between walls, columns, pillars, foundations etc. In the past, beams were square, timber, metals, stone combination of timber and metal for example filth beam. Beams are used to carry vertical load. Beam is a flexible member which can resist the compression and tension force.

13. What is column ?

Column is a structural member which transmits the load of structure to the footing and soil. In other words, column is a compressive member that is constructed from concrete, reinforcement concrete, bricks and blocks etc. It is used to support beam or arches where the slab or ceiling rest.  It can be of many shapes such as rectangular, square, circular, hexagonal, octagonal etc. The column is arising from the base and rest on the foundation. It can be constructed of masonry or steel. It is design to resist the lateral force and for the purpose of wind or earth quack. A column might be used for decorative purpose.

14. Difference between concrete and mortar ?

The difference between concrete and mortar are:



It is mixture of cement, fine aggregate, coarse aggregate and water.

It is the mixture of cement, fine aggregate and water.

It is a complete building material and used in the construction of foundations, walls, beams & slabs etc.

It is a bonding material & used as a glue between bricks & blocks.

It is used alone for construction of beams, slabs & foundations etc.

It can’t be used alone

Concrete cant be for filling the gaps.

Mortar can be used for filling the gaps because of absence of coarse aggregate (gravel) and presence of water and cement, sand.

The strength of concrete is greater than mortar

The strength of mortar is less than concrete

The estimation of concrete in construction is different from mortar.

The estimation of mortar in construction is different from concrete.

Concrete is used in slabs, columns, retaining wall, piles, pier caps, foundations, ramps etc.

Mortar is used in masonry work, plastering, filling, floor leveling, and repairing damage structures made of concrete.

Most of the properties of concrete that are better than mortar is  durability, permeability, compressive strength and lack of cracks etc.

The mortar does not have better  durability, permeability, compressive strength and lack of cracks etc.

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