NEBOSH Fire Safety

Question 1

What are the three elements required for fire to exist (fire triangle)?

Accepted Answer

Fuel, oxygen, and ignition source (heat)

Answer

Fuel, water, and electricity

Answer

Oxygen, nitrogen, and fuel

Answer

Heat, smoke, and fuel

Question 2

What type of fire extinguisher is used for class B fires (flammable liquids)?

Accepted Answer

Foam or CO₂ extinguisher

Answer

Water extinguisher

Answer

Dry powder is first choice; water is acceptable for class B

Answer

Class B fires require specialist military equipment

Question 3

What is a 'hot work' fire watch and what are the responsibilities?

Accepted Answer

A designated person who monitors the area during and for 30–60 minutes after hot work to detect and extinguish any fires started by sparks or heat

Answer

A person who controls access to the hot work area

Answer

A person who operates welding equipment

Answer

A person who manages the permit to work paperwork

Question 4

What is the recommended sequence of actions when discovering a fire?

Accepted Answer

Alert (raise the alarm), Contain (close doors), Evacuate (leave and take others), Call emergency services (999/911/112), Attack only if safe and trained to do so

Answer

Attack the fire first with the nearest extinguisher

Answer

Continue working and alert others on the way out

Answer

Call emergency services first before raising the internal alarm

Question 5

How does automatic sprinkler system work and what is its purpose?

Accepted Answer

Heat-sensitive sprinkler heads activate individually when local temperature exceeds their rated threshold, discharging water to suppress the fire — not set off by smoke

Answer

All sprinkler heads activate simultaneously when one is triggered

Answer

Sprinklers are activated by smoke detectors

Answer

Sprinklers always cause more water damage than the fire would

Question 6

What is the purpose of fire detection systems in buildings?

Accepted Answer

To detect fire at the earliest possible stage, trigger alarms to alert occupants, and enable swift evacuation before conditions become untenable

Answer

To extinguish fires automatically

Answer

To notify fire services but not occupants

Answer

Detection systems are optional in Gulf commercial buildings