Construction Test 4

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.

Accepted Answer

Closer

Answer

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 _________.

Accepted Answer

30 to 35 kg/cm²

Answer

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.

Accepted Answer

Lower beam of lower tier

Answer

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 _______.

Accepted Answer

All of the options are correct

Answer

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 _______.

Accepted Answer

All of the options are correct

Answer

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.

Construction Practice Test

Construction Practice Test

Construction Test 4