Basic Civil Engineering
NEC Civil Engineering · 1,155 practice MCQs
The Basic Civil Engineering chapter is essential for aspiring engineers preparing for the NEC licensing exam. This chapter covers fundamental concepts, materials, and techniques crucial for civil engineering practice.
With 1155 practice MCQs, it provides a comprehensive review of topics such as damp proof courses, workability of materials, and cement standards. Mastering these concepts will enhance your understanding and increase your chances of success in the exam.
Sample questions with answers
1.What is the main purpose of a damp proof course (DPC)?
- A.To stop moisture from rising
- B.To reduce heat loss
- C.To prevent structural settlement
- D.To avoid wall cracking
Why: The main purpose of a damp proof course (DPC) is to prevent moisture from rising through the walls, which can cause damage to the structure and interior finishes.
2.What does a brick with white salt patches after drying indicate failure in?
- A.Efflorescence test
- B.Compressive strength test
- C.Hardness test
- D.Water absorption test
Why: A brick with white salt patches after drying indicates failure in the efflorescence test, which measures the presence of soluble salts that can migrate to the surface and cause deterioration.
3.Which element has the GREATEST influence on workability?
- A.Size of aggregates
- B.Length of mixing time
- C.Grade of cement
- D.Amount of water
Why: The amount of water has the greatest influence on workability because it affects the consistency and ease of mixing and placing concrete, impacting the overall quality of the mix.
4.What does the aggregate crushing value test show?
- A.Impact resistance
- B.Water absorption
- C.Compressive strength
- D.Durability
Why: The aggregate crushing value test shows compressive strength because it measures how much load the aggregate can withstand before failing, which is crucial for determining the strength of concrete.
5.What is mud mortar best used for?
- A.High-rise walls
- B.Reinforced foundations
- C.Temporary rural structures
- D.Underwater works
Why: Mud mortar is best used for temporary rural structures because it is cost-effective and suitable for low-strength applications where high durability is not required.
6.Pozzolanic cement is created by partly substituting clinker with which material?
- A.Magnesium carbonate
- B.Silica
- C.Fly ash
- D.Ground limestone
Why: Pozzolanic cement is created by partly substituting clinker with fly ash, which enhances the cement's properties and reduces environmental impact by recycling waste material.
7.What is the common ratio for plaster on internal walls?
- A.1:8
- B.1:3
- C.1:6 (Cement:Sand)
- D.1:2
Why: The common ratio for plaster on internal walls is 1:6 (Cement:Sand), which provides a good balance of strength and workability for finishing surfaces.
8.According to which standard are the initial and final setting times of cement measured?
- A.IS 3495 Part 4
- B.IS 4031 Part 5
- C.IS 1608
- D.IS 2386 Part II
Why: The initial and final setting times of cement are measured according to IS 4031 Part 5, which provides standardized methods for testing cement properties.
9.What is the term for the line from the instrument to the target in levelling?
- A.Line of collimation
- B.Vertical axis
- C.Backsight line
- D.Bearing axis
Why: The term 'line of collimation' refers to the line from the instrument to the target in levelling, which is essential for ensuring accurate measurements.
10.What happens with a section that has a higher moment of inertia?
- A.Bends easily
- B.Provides more resistance to bending
- C.Has no k value
- D.Has a smaller centroid
Why: A section with a higher moment of inertia provides more resistance to bending, meaning it can withstand greater loads without deforming, which is important for structural integrity.
11.In building regulations, what does 'plinth level' refer to?
- A.Depth of the foundation
- B.Height of the lintel
- C.Height above the ground
- D.Height of the roof slab
Why: 'Plinth level' in building regulations refers to the height above the ground, which is critical for ensuring proper drainage and preventing water ingress into the building.
12.What are contingencies in an estimate generally meant to cover?
- A.Labour costs
- B.Transport charges
- C.Unforeseen expenses
- D.Measurement errors
Why: Contingencies in an estimate are generally meant to cover unforeseen expenses, allowing for flexibility in budgeting to accommodate unexpected costs during construction.
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