Which of the following poses the highest risk of injury when using a drill?

Selecting eye injury as the highest risk of injury when using a drill is pertinent due to the nature of drilling operations. When using a drill, particularly in materials like metal or wood, the high-speed rotation can lead to the creation of small shards or debris. These particles can easily become airborne and pose a significant risk of eye injury, which can range from mild irritation to serious damage.

Protective eyewear is essential when operating drills to safeguard against such injuries. Though other risks like electrical shock, noise exposure, and heat exposure are important and can lead to significant harm, they do not typically pose the immediate and high-frequency threats associated with drilling activities compared to the likelihood of eye injury from flying debris. Therefore, in terms of the specific context of using a drill, eye injury stands out as a predominant concern.