CSCS High-Risk Activities 2

Question 1

When working in a confined space, what must be checked before entry?

Accepted Answer

Atmospheric testing for oxygen levels and hazardous gases

Answer

Confined spaces must be tested for oxygen deficiency, excess oxygen, and toxic or flammable gases before any worker enters.

Question 2

What is the purpose of a hot work permit on a construction site?

Accepted Answer

To authorize work that could generate heat, sparks, or flame near flammable materials

Answer

A hot work permit controls activities like welding, cutting, or grinding near combustible materials to prevent fires.

Question 3

Which action is required before excavating near underground services?

Accepted Answer

Obtain service drawings and use safe digging techniques to locate services

Answer

Service drawings must be obtained and safe digging practices used to avoid striking buried cables, pipes, or other utilities.

Question 4

What is the maximum safe angle of repose for an unsupported excavation in average soil?

Accepted Answer

45 degrees

Answer

In average soil conditions, excavation sides should be battered back to 45 degrees or supported to prevent collapse.

Question 5

When should a worker refuse to use a mobile elevated work platform (MEWP)?

Accepted Answer

When wind speeds exceed the manufacturer's safe limit

Answer

MEWPs must not be operated in wind speeds above the manufacturer's stated limit, as strong winds can cause the platform to overturn or swing.

CSCS - Construction Skills Certification Scheme Practice Test