Question 1

A profile board is used to determine&#10;A) The position of electricity cables on site&#10;B) The depth of the water table&#10;C) The depth of the topsoil&#10;D) The position of boulders on site&#10;E) The position of trenches on site

Accepted Answer

A profile board is primarily used in construction to mark out the position of trenches on a site, ensuring that excavation work is carried out accurately according to the site plan.

Question 2

The purpose of a waling in support to excavation is to&#10;A) Support the soil to the side of the excavation&#10;B) Support the struts&#10;C) Support the poling boards&#10;D) Provide access into the trench&#10;E) Provide egress out of the trench

Accepted Answer

C

Question 3

A tractor shovel would generally be used to excavate&#10;A) Trenches&#10;B) Basements&#10;C) Vegetation&#10;D) Boreholes&#10;E) Trial pits

Accepted Answer

A tractor shovel is a versatile piece of equipment that can be used for a variety of tasks, including excavating vegetation.

Question 4

Topsoil is excavated from the site before construction work commences mainly because&#10;A) It contains harmful bacteria&#10;B) It has a high level of acidity&#10;C) It has a high level of alkalinity&#10;D) It supports plant growth&#10;E) It has a strong odour

Accepted Answer

Topsoil is removed before construction because it is rich in organic matter and nutrients, making it ideal for supporting plant growth. This layer is not stable enough to support structures, hence the need for its removal.

Question 5

Close boarded excavation support would generally be used in&#10;A) Stiff clay soils&#10;B) Loose gravel&#10;C) Firm sandy soil&#10;D) Compact shale&#10;E) Organic soils

Accepted Answer

The answer of Close boarded excavation support would generally be...

Question 6

The purpose of a poling board in support to excavation is to&#10;A) Support the soil to the side of the excavation&#10;B) Support the struts&#10;C) Support the walings&#10;D) Provide access into the trench&#10;E) Provide egress out of the trench

Accepted Answer

The purpose of a poling board in support to excavation is to support the soil to the side of the excavation. It ensures that the sides of the excavation do not collapse or cave in, which could be dangerous for workers and damage the structure being excavated. The poling boards are typically placed vertically against the excavation walls and are supported by struts and walings. While access and egress are important considerations for excavation safety, they are not the primary purpose of a poling board.

Question 7

A bulldozer would generally be used to excavate&#10;A) Trenches&#10;B) Basements&#10;C) Site strip&#10;D) Boreholes&#10;E) Trial pits

Accepted Answer

A bulldozer is a powerful machine used for site strip, which involves removing all the vegetation, topsoil, and debris from a site before foundation works begin. This process prepares the site for further excavation and construction activities. Trenching, excavation for basements, boreholes, and trial pits require more precise and specialized excavation equipment.

Question 8

A backhoe is a versatile machine because A) It uses diesel fuel B) It has pneumatic tyres C) It can excavate through 360⁰ D) It can excavate in very confined spaces E) It can be operated without a licence

Accepted Answer

The answer of A backhoe is a versatile machine because&#10;A)...

Question 9

Quarter sheeting excavation support would generally be used in&#10;A) Firm clay soils&#10;B) Loose gravel&#10;C) Saturated sandy soil&#10;D) Fine silts&#10;E) Organic soils

Accepted Answer

Quarter sheeting excavation support is commonly used in firm clay soils as it provides good lateral support and prevents collapse of the excavation walls. It is not recommended for loose or saturated soils as they require different types of support systems. Fine silts and organic soils may also require different support systems depending on their specific characteristics.

Question 10

The angle of repose of soil is&#10;A) The angle at which non-cohesive soils will suffer shear failure&#10;B) The angle at which cohesive soils will suffer plasticity failure&#10;C) The angle at which non-cohesive soils will retain water&#10;D) The angle at which soils will be frost resistant&#10;E) The angle at which banked soils will be stable

Accepted Answer

The answer of The angle of repose of soil is&#10;A)...

Deck 4: Excavations