Construction Test 4 — Questions and Answers

Question 1: A brick known as a _______ is typically used at the end of a course of bricks to stagger vertical joints in succeeding courses of a wall.

Stretcher
Closer (Correct answer)
Header
Bat

Correct answer: Closer

A closer is a brick that is cut or manufactured to a specific size, typically a quarter or half brick, and is inserted at the end of a course. Its primary purpose is to adjust the length of the course, ensuring that the vertical joints (perpends) in adjacent courses are staggered. This staggering, known as bonding, is crucial for distributing loads, enhancing the wall's strength, and preventing continuous vertical cracks.

Question 2: The capacity of granite to support weight is typically _________.

30 to 35 kg/cm² (Correct answer)
15 to 20 kg/cm²
40 to 45 kg/cm²
42 to 46 kg/cm²

Correct answer: 30 to 35 kg/cm²

Granite is a very dense, strong, and durable igneous rock, making it an excellent material for foundations and structural elements. Its high compressive strength allows it to support significant loads without crushing. The typical bearing capacity of granite ranges from 30 to 35 kg/cm² (approximately 3000 to 3500 kN/m²), which is considerably higher than most other natural stones or soils.

Question 3: A minimum 15 cm cover is supplied on the ______ in grillage foundations.

Exterior beams' ends
The outside beams' ends
Lower beam of lower tier (Correct answer)
All options are incorrect

Correct answer: Lower beam of lower tier

Grillage foundations consist of a network of steel beams embedded in concrete, designed to distribute heavy column loads over a large area of soil. To protect these steel beams from corrosion and ensure proper load transfer, a minimum concrete cover is required. Specifically, the lower beam of the lower tier, which is closest to the soil, needs a minimum cover of 15 cm (or 6 inches) to provide adequate protection.

Question 4: An existing structure's stability could be compromised by _______.

Mining nearby.
The tremors brought generated by traffic movements
Increasing water table
All of the options are correct (Correct answer)

Correct answer: All of the options are correct

The stability of an existing structure can be severely compromised by various external factors. Nearby mining operations can cause ground settlement or subsidence, while tremors from traffic movements can induce vibrations and fatigue in the structure. Additionally, an increasing water table can reduce soil bearing capacity, cause uplift pressures, or lead to soil liquefaction, all of which threaten foundation and structural integrity.

Question 5: The Auger boring technique is inappropriate for _______.

Vary soft soil
Really tough soil
Concrete soil
All of the options are correct (Correct answer)

Correct answer: All of the options are correct

Auger boring is a soil exploration technique that uses a rotating helical screw to bring soil samples to the surface. While effective in many soil types, it is inappropriate for very soft soils where the borehole might collapse, extremely tough soils where the auger cannot penetrate effectively, or concrete soil as it is designed for natural soil, not hardened materials. In such conditions, other drilling methods are required.

Question 6: Causes of dampness

Soil solidification
Paint whitening
Efflorescence
All of the options are incorrect (Correct answer)

Correct answer: All of the options are incorrect

Dampness in buildings is typically caused by issues such as rising damp (capillary action from the ground), penetrating damp (water ingress through walls or roof), condensation (moisture in the air), or plumbing leaks. Soil solidification is a ground improvement technique, paint whitening can be a symptom of dampness or other issues, and efflorescence is a symptom of moisture carrying salts to the surface, not a cause of dampness itself. Therefore, none of the listed options are direct causes of dampness.

Question 7: _______ support loads partially by friction and partially by resting on hard strata.

Friction bearing pile (Correct answer)
Rough pile
Bearing pile
Friction pile

Correct answer: Friction bearing pile

Piles are classified by how they transfer loads to the underlying soil. A friction bearing pile, also known as an end-bearing friction pile or combination pile, derives its load-carrying capacity from both skin friction along its shaft and end bearing at its tip. This type of pile is used when a firm stratum is present at a reasonable depth, but the overlying soil also contributes significantly to supporting the load through friction.

Question 8: _______ refers to the opening in a sloping roof whose top is parallel to the roof surface.

Lantern window
Louvered window
Sky light window (Correct answer)
Dormer window

Correct answer: Sky light window

A skylight window is an opening in a sloping roof designed to admit natural light and sometimes provide ventilation. Its top surface is typically installed parallel to the slope of the roof, allowing it to integrate seamlessly with the roofline. This design distinguishes it from other window types like dormers, which project vertically from a sloping roof.

Question 9: ______ are those that are installed in flat roofed rooms.

Sky window
Lantern window (Correct answer)
Dormer window
Louvered window

Correct answer: Lantern window

A lantern window, often referred to as a roof lantern, is a structural element that sits on a flat roof, creating an elevated glazed section. It is specifically designed to bring natural light into the room below and can also provide ventilation. Unlike skylights, which are typically flush with a sloping roof, lantern windows project upwards from a flat roof surface.

Question 10: The landing's minimum width should be

A width of stairs that is halved
Equivalent to the stair width
Stair width twice as wide
Equivalent to the stair width (Correct answer)

Correct answer: Equivalent to the stair width

For safety and ease of movement, the minimum width of a stair landing should be at least equivalent to the width of the stairs it serves. This ensures that there is ample space for users to turn, rest, or pass each other without obstruction, maintaining a consistent flow and preventing bottlenecks. This standard helps ensure safe and comfortable egress.

Question 11: When examining the area, it is discovered that a large layer of very firm clay sits on top of a thick layer of soft clay. The following kind of foundation is helpful in this circumstance:

Grillage foundation
Raft foundation (Correct answer)
Pile formation
All of the options are incorrect

Correct answer: Raft foundation

In a scenario where a large layer of very firm clay sits on top of a thick layer of soft clay, a raft foundation (also known as a mat foundation) is the most suitable choice. A raft foundation is a large concrete slab that covers the entire footprint of the building, distributing the structural load over a wide area. This significantly reduces the pressure on the underlying soft clay layer and minimizes the risk of differential settlement, ensuring overall stability.

Construction Test 4

A brick known as a _______ is typically used at the end of a course of bricks to stagger vertical joints in succeeding courses of a wall.