Construction Test 1

Question 1

Choose one of the following to represent the false statement:

Accepted Answer

The only purpose of adding cement to lime mortar is to improve its hydraulic qualities.

Answer

The statement is false because adding cement to lime mortar, creating gauged mortar, serves multiple purposes beyond just improving its hydraulic qualities. Cement significantly increases the mortar's compressive strength and accelerates its setting time. While it does enhance hydraulic properties (ability to set underwater), it also improves overall strength, durability, and reduces shrinkage, making the mortar more robust for various construction applications.

Question 2

If the soil is _______, a pile foundation is typically offered.

Accepted Answer

All options are correct

Answer

Pile foundations are a type of deep foundation typically used when the soil near the surface is weak or unsuitable to support the structural loads. This includes conditions where the soil is highly compressible, loosely 'made up' or unconsolidated, or saturated with water, which significantly reduces its bearing capacity. In such cases, piles transfer the building's weight to deeper, stronger soil layers or bedrock.

Question 3

The soil's bearing capacity cannot be increased by

Accepted Answer

Watering the soil's surface

Answer

Watering the soil's surface generally decreases its bearing capacity, especially for cohesive soils like clay, by increasing the moisture content and reducing shear strength. Conversely, methods such as making sand heaps (implying compaction or replacement), ramming dirt with crushed stone (compaction and reinforcement), and removing subsurface water (reducing pore pressure) are all effective techniques used to improve soil bearing capacity and stability.

Question 4

When drilling in ________, rotary drilling is the fastest method.

Accepted Answer

All of these

Answer

Rotary drilling is a highly versatile and efficient method for creating boreholes in a wide range of geological conditions. It operates by rotating a cutting bit that grinds or shears through the material, making it effective in various soil types including soft clay, loose sandy soil, and even hard rocky soils. Its adaptability and speed make it a preferred choice for many drilling applications.

Question 5

For beams and slabs, concrete slump should range from ________.

Accepted Answer

30 to 125 mm

Answer

Concrete slump is a measure of its workability, indicating the consistency of the fresh concrete mix. For structural elements like beams and slabs, a slump range of 30 to 125 mm (approximately 1 to 5 inches) is generally recommended. This range ensures the concrete is workable enough to be placed and compacted effectively without excessive segregation, while still maintaining adequate strength and durability after hardening.

Construction Practice Test

Construction Practice Test

Construction Test 1