11.1 Hazards and risks

Which factor affects the severity of an electric shock?

• 1 Weather forecast
• 2 Duration of contact
• 3 The colour of the cable
• 4 The age of the building

Wet skin makes shock more dangerous because it:

• 1 Reduces voltage
• 2 Insulates the person
• 3 Lowers body resistance
• 4 Raises resistance

A secondary effect of electric shock can be:

• 1 Asbestosis
• 2 A fall from height
• 3 Legionnaires' disease
• 4 Hearing loss

In electric shock, a person may not be able to let go because of:

• 1 Cold
• 2 Muscle contraction
• 3 Light
• 4 Noise

Ventricular fibrillation is:

• 1 A noise effect
• 2 A heart disturbance caused by current through the chest
• 3 A lung disease
• 4 A skin burn

Which of these affects how severe an electric shock is?

• 1 The colour of the cable
• 2 The size of the plug
• 3 The path the current takes through the body
• 4 The brand of tool

Electrical burns can be caused by:

• 1 Cold weather
• 2 Noise
• 3 Direct contact or a nearby arc
• 4 Radiation only

Electrical equipment is likely to cause fires when it is:

• 1 Well maintained
• 2 Double insulated
• 3 Defective, damaged or overheated
• 4 Unused

Charging portable equipment can cause fires if:

• 1 It is fully charged
• 2 It is switched off
• 3 It is cool
• 4 It is overheated or left unattended

A hazard of excavation is:

• 1 Noise from cables
• 2 Radon
• 3 Asbestos only
• 4 Striking underground cables

Work near overhead lines is dangerous because:

• 1 There is no voltage
• 2 Contact or a flashover can cause a shock
• 3 The lines are quiet
• 4 They are never live

A worker receives a shock and falls from a ladder. The fall is:

• 1 Unrelated
• 2 The primary effect of noise
• 3 A secondary effect of the shock
• 4 A radiation effect

Wet conditions increase electrical risk because:

• 1 Water lowers resistance and conducts current
• 2 Water insulates
• 3 Water removes current
• 4 Water is cold

Equipment used in wet places needs to be:

• 1 Damaged equipment
• 2 Any equipment
• 3 Old equipment
• 4 Suitable for that environment

A small current passing through the heart:

• 1 Can kill
• 2 Is always harmless
• 3 Is never dangerous
• 4 Cannot cause injury