Officer Entrance Exam Questions And Answers.

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. {Ans: From the information given above, it can be validly concluded that some devices in which a physical reaction is produced, such as that caused by overloading a container with compressed air, are mechanical explosives}Impressions made by the ridges on the ends of the fingers and thumbs are useful means of identification, since no two persons have the same pattern of ridges. If finger patterns from fingerprints are not decipherable, then they cannot be classified by general shape and contour or by pattern type. If they cannot be classified by these characteristics, then it is impossible to identify the person to whom the fingerprints belong. {Ans: From the information given above, it CANNOT be validly concluded that if fingerprints are decipherable,