Explosives Safety Exam A JP
Android app by razuma. Business · razuma
- Store rating
- Unknown
- Store rating count
- Unknown
- Download price
- Free to download
- In-app purchases
- Not listed in captured metadata
- Version
- 1.0
- Listing last refreshed
- 2026-09-12
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Store description excerpt
A study app for Japan's Class A Explosives Handling Safety Supervisor exam (甲種火薬類取扱保安責任者試験). This national qualification is based on the Explosives Control Act. A safety supervisor must be appointed by anyone who owns or occupies an explosives magazine, or who consumes explosives. The Class A licence applies to magazines storing 20 tonnes or more of explosives per year, and sites consuming 1 tonne or more per month; it carries no upper limit and also covers Class B work. All 350 practice questions come with a clear explanation. ■ Subjects Covered (350 questions across 2 subjects, 10 areas) 【Law - Explosives Control Act and related regulations (20 questions in the exam)】 • General provisions, definitions, manufacture, sale, transfer and import (42) • Storage and explosives magazines (46) - permits, inspections, magazine types, maximum quantities • Transport, consumption and disposal (46) - notifications, transport certificates, exempt quantities • Handling, safety training, supervisors, records and penalties (30) • Quantity calculations (17) - conversion to explosive equivalent, maximum storage for class 1 and class 2 magazines, safety distances 【General Explosives Science (20 questions in the exam)】 • Classification, composition and properties (37) - deflagration and detonation, oxygen balance, black powder, smokeless powder, ANFO, water gel • Explosion phenomena, sensitivity, performance tests and stability (37) - force of powder, power and brisance, detonation pressure, sympathetic detonation, dead pressing • Pyrotechnic devices - detonators, safety fuse, detonating cord (38) - electric detonators, DS and MS detonators, delay blasting • Blasting methods, electric blasting and safety (35) - free face and burden, crater index, blasting coefficient, bench blasting, controlled blasting • Blasting calculations and force of powder (22) - Hauser's formula, crater radius, bench blasting, firing circuits The exam is administered by prefectural governors once a year at venues in each prefecture. The Class A paper has 40 questions in total - 20 on law and 20 on general explosives science - and you need at least 60% in each subject to pass. The biggest difference from Class B is the weight given to calculations: determining maximum storage by explosive equivalent, and working out charge weights with Hauser's formula. This app separates the calculation areas out as "Law 5" and "General Explosives Science 5", with 39 questions between them. The explanations build each formula step by step, so you learn how to solve the problems rather than memorising equations. The law section rewards accurate recall of figures and procedures, making it the most reliable place to score. This app splits each subject into five areas, so you can drill the easily confused figures - maximum storage quantities, exempt transport quantities, safety distances - area by area, with accuracy tracked automatically. There are no eligibility requirements: anyone can sit the exam. The
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