Question

timber from the back of a truck: use correct manual handling techniques
scrap and debris left around site: choose...
airborne materials e.g. dust, fumes, paint overspray, chemical drift: choose...
fire in skip bin: alert supervisor and carry out emergency procedures within your training and responsibilities

Explanation:

Identify hazards and controls

The task requires matching workplace hazards to their appropriate safety control measures.

Analyze manual handling hazard

The first hazard is unloading timber from the back of a truck.
This involves physical lifting and carrying.
The correct control is already selected: "Use correct manual handling techniques".

Analyze site debris hazard

The second hazard is "Scrap and debris left around site".
Leaving debris around creates trip hazards and clutter.
Applying Construction Site Clean-up principles, the appropriate control is to clean up the work area and dispose of waste in designated bins.

Analyze airborne materials hazard

The third hazard is "Airborne Materials e.g. dust, fumes, paint overspray, chemical drift".
These materials pose inhalation risks.
Applying Respiratory Protection principles, the appropriate control is to wear suitable personal protective equipment (PPE) such as a respirator or dust mask, and ensure adequate ventilation.

Analyze emergency hazard

The fourth hazard is "Fire in skip bin".
A fire is an immediate emergency.
The correct control is already selected: "Alert supervisor and carry out emergency procedures within your training and responsibilities".

Answer:

Question 1

Unloading timber from the back of a truck:
Use correct manual handling techniques

Question 2

Scrap and debris left around site:
Clean up work area and dispose of rubbish in skip bins

Question 3

Airborne Materials e.g. dust, fumes, paint overspray, chemical drift:
Wear appropriate respiratory protection (PPE) and ensure adequate ventilation

Question 4

Fire in skip bin:
Alert supervisor and carry out emergency procedures within your training and responsibilities