CITB Excavation and Groundworks

Question 1

What is the minimum safe distance from the edge of an excavation that spoil should be placed to prevent collapse?

Accepted Answer

1 meter

Answer

0.5 meters

Answer

2 meters

Answer

3 meters

Question 2

Which document must be completed before any excavation work begins near underground services?

Accepted Answer

Permit to dig

Answer

Risk assessment only

Answer

Method statement only

Answer

Site induction record

Question 3

What is the primary purpose of shoring in an excavation?

Accepted Answer

To support the sides and prevent collapse

Answer

To drain water from the trench

Answer

To mark the excavation boundary

Answer

To compact the soil at the base

Question 4

Which utility cable color in the UK indicates a high-voltage electricity supply?

Accepted Answer

Red

Answer

Yellow

Answer

Blue

Answer

Black

Question 5

What method is used to safely locate buried services before excavation?

Accepted Answer

Using a cable avoidance tool (CAT)

Answer

Probing with a metal rod

Answer

Digging trial pits only

Answer

Reviewing site drawings only

Question 6

At what depth does an excavation generally require a formal inspection by a competent person?

Accepted Answer

More than 2 meters

Answer

More than 1 meter

Answer

More than 1.2 meters

Answer

More than 1.5 meters

Question 7

Which type of soil is MOST likely to be self-supporting and less prone to collapse in shallow excavations?

Accepted Answer

Firm cohesive clay

Answer

Loose sand

Answer

Wet clay

Answer

Made ground