IOSH Controlling Risks

Question 1

What is 'elimination' in the hierarchy of control?

Accepted Answer

Completely removing the hazard from the workplace

Answer

Elimination means completely removing the hazard so that the risk no longer exists. For example, removing a trip hazard, stopping a dangerous process, or redesigning work so a hazardous activity is no longer needed. It is the most effective control.

Question 2

What is 'substitution' as a control measure?

Accepted Answer

Replacing a hazardous substance, process or equipment with a less hazardous alternative

Answer

Substitution involves replacing something hazardous with something less hazardous. For example, using a water-based paint instead of a solvent-based one, or using a less noisy machine. It is the second most effective control after elimination.

Question 3

What is an 'engineering control'?

Accepted Answer

A physical control such as a guard, ventilation system, or enclosure that reduces exposure

Answer

Engineering controls use physical means to reduce or prevent exposure to hazards. Examples include machine guards, local exhaust ventilation (LEV), acoustic enclosures, safety interlocks, and handrails. They are preferred over administrative controls and PPE.

Question 4

What is an 'administrative control' measure?

Accepted Answer

A control that relies on procedures, training, signage, job rotation or scheduling

Answer

Administrative controls change the way people work rather than removing or physically controlling the hazard. Examples include safe systems of work, procedures, training, supervision, signage, job rotation, and limiting exposure time.

Question 5

Why is PPE considered the last resort in the hierarchy of control?

Accepted Answer

Because it only protects the individual, can fail, and depends on correct use

Answer

PPE is the least effective control because it only protects the individual wearing it, it can be uncomfortable, it may not be worn correctly, it can fail or degrade, and it doesn't reduce the hazard itself. Higher-level controls protect everyone.

IOSH Managing Safely Practice Test

IOSH Managing Safely Practice Test

IOSH Controlling Risks