Explosives are substances or devices capable of producing a volume of rapidly expanding gases that exert a sudden pressure on their surroundings. Chemical explosives are the most commonly used, although there are mechanical and nuclear explosives. All mechanical explosives are devices in which a physical reaction is produced, such as that caused by overloading a container with compressed air. While nuclear explosives are by far the most powerful, all nuclear explosives have been restricted to military weapons.

Question

Quizplus · Accepted Answer

The correct answer is E. The third sentence states the overlap between all mechanical explosives and devices in which a physical reaction is produced, such as that caused by overloading a container with compressed air. From this, we can safely conclude that some devices in which a physical reaction is produced, such as that caused by overloading a container with compressed air, are mechanical explosives.
Response A is incorrect because the paragraph does not provide sufficient information to validly conclude that all explosives which have been restricted to military weapons are nuclear weapons. It may be that some types of explosives other than nuclear weapons also have been restricted to military weapons.
Responses B and C are incorrect because they contradict the paragraph. Response B contradicts the third sentence, and Response C contradicts the last sentence
Response D is incorrect because the paragraph provides no information about whether or not mechanical explosives are restricted to military weapons.

Explosives Are Substances or Devices Capable of Producing a Volume