Federal Emergency Management Agency (FEMA) Standardized Awareness Practice Test

Which category of high explosives is described as extremely sensitive and requires slight impulse to detonate?

1. Secondary explosives

2. Tertiary explosives

3. Primary explosives

4. Quaternary explosives

The correct answer is: Primary explosives

The category of high explosives that is described as extremely sensitive and requires a slight impulse to detonate is known as primary explosives. These types of explosives are characterized by their sensitivity to heat, shock, friction, and other stimuli, allowing them to detonate with minimal force. Due to their sensitive nature, primary explosives are often utilized in applications such as detonators and safety fuses, where controlled initiation is essential. In contrast, secondary explosives require a more substantial amount of energy to detonate, making them less sensitive and more stable during handling and storage. Tertiary explosives are typically even less sensitive than secondary explosives and are often used in bulk for larger applications. Quaternary explosives are less commonly used and do not fit the criteria of being extremely sensitive. Understanding the characteristics of these different categories of explosives is vital for ensuring safety and effective handling in various applications.