Nebosh Exam With All Questions And
Answers
What are the 5 steps in a risk assessment? - ANSWER ✔️ 1. Look for the
hazards
2. Decide who might be harmed and how
3. Evaluate the risks
4. Record the significant findings
5. Review the assessment and revise it if necessary
What is the hierarchy of risk control? - ANSWER ✔️ a) eliminate the
hazard
b) substitute with less hazardous materials, processes, operations or
equipment
c) use engineering controls
d) use safety signs, markings and warning devices and administrative
controls
e) use personal protective equipment
Give examples of sources of ignition in a typical construction site. -
ANSWER ✔️ Naked flames
External sparks
Internal sparking
Hot surfaces
Static electricity
What are the 5 classifications of fire and how are they extinguished?
How are electrical fires extinguished? - ANSWER ✔️ Class A: solid
materials eg paper or wood
Extinguished by cooling using water (red)
, Class B: liquids or liquefied solids eg paint, oil or fats
B1: liquids soluble in water eg methanol.
Extinguished by CO2 (black) and dry powder (blue)
B2: liquids not soluble in water eg petrol and oil.
Extinguished by foam (cream), CO2, dry powder
Class C: gases eg butane and propane.
Extinguished by dry powder
Class D: fires involving metals eg aluminium or magnesium.
Extinguished by special dry powders eg containing graphite
Class F: cooking oil or fat in catering.
Extinguished with yellow extinguisher
Electrical fires are extinguished by CO2 or dry powder.
What are the 4 ways heat can be transmitted? - ANSWER ✔️ Convection
Conduction
Radiation
Direct burning
What are common causes of fire on a construction site? - ANSWER ✔️ -
activities creating flammable dust
- loose packaging
- poor storage
- flammable residues
- buried services
- poor disposal
- overheating
- improper use of welding or cutting equipment
- overloaded electrical equipment
- damaged cables, improper fuses
- bonfires getting out of control
Answers
What are the 5 steps in a risk assessment? - ANSWER ✔️ 1. Look for the
hazards
2. Decide who might be harmed and how
3. Evaluate the risks
4. Record the significant findings
5. Review the assessment and revise it if necessary
What is the hierarchy of risk control? - ANSWER ✔️ a) eliminate the
hazard
b) substitute with less hazardous materials, processes, operations or
equipment
c) use engineering controls
d) use safety signs, markings and warning devices and administrative
controls
e) use personal protective equipment
Give examples of sources of ignition in a typical construction site. -
ANSWER ✔️ Naked flames
External sparks
Internal sparking
Hot surfaces
Static electricity
What are the 5 classifications of fire and how are they extinguished?
How are electrical fires extinguished? - ANSWER ✔️ Class A: solid
materials eg paper or wood
Extinguished by cooling using water (red)
, Class B: liquids or liquefied solids eg paint, oil or fats
B1: liquids soluble in water eg methanol.
Extinguished by CO2 (black) and dry powder (blue)
B2: liquids not soluble in water eg petrol and oil.
Extinguished by foam (cream), CO2, dry powder
Class C: gases eg butane and propane.
Extinguished by dry powder
Class D: fires involving metals eg aluminium or magnesium.
Extinguished by special dry powders eg containing graphite
Class F: cooking oil or fat in catering.
Extinguished with yellow extinguisher
Electrical fires are extinguished by CO2 or dry powder.
What are the 4 ways heat can be transmitted? - ANSWER ✔️ Convection
Conduction
Radiation
Direct burning
What are common causes of fire on a construction site? - ANSWER ✔️ -
activities creating flammable dust
- loose packaging
- poor storage
- flammable residues
- buried services
- poor disposal
- overheating
- improper use of welding or cutting equipment
- overloaded electrical equipment
- damaged cables, improper fuses
- bonfires getting out of control
