危険物乙4 問題集｜危険物取扱者 乙種4類 解説

StackWorks LLC

About this app

This is a learning app for the Class B, Category 4 Hazardous Materials Handler license. In addition to questions published by the Fire Service Examination Research Center, it includes practice problems covering three subjects: laws and regulations, physics and chemistry, and the properties of hazardous materials and methods of fire prevention and extinguishing. Common mistakes, such as calculating designated quantities and comparing flash points and specific gravities, are reinforced with explanations, flashcards, and key point notes.


■ Contents
・Past Exam Questions: 39 questions (2 sets)
・Practice Questions: 248 questions
・Explanations for all questions
・Flashcards: 97 cards
・Key Point Notes: 11 items

■ Subject Areas
・Laws and Regulations Concerning Hazardous Materials
・Basic Physics and Basic Chemistry
・Properties of Hazardous Materials and Methods of Fire Prevention and Extinguishing

■ Basic Exam Information
・Exam Dates: Held several times a year to monthly by prefecture (check the schedule provided by each branch)
・Passing Criteria: 60% or higher correct answers in each subject: Laws and Regulations, Physics and Chemistry, and Properties and Fire Extinguishing

■ Learning Features to Help You Pass
・Today's Study: Automatically presents questions that need review and new questions, tailored to the scoring of the actual exam and your weak points.
・Review questions that reappear when you're starting to forget. Setting an exam date adjusts the review cycle so that you complete one round before the exam.
・Practice by specifying year, subject area, and conditions. Incorrect and ambiguous questions are automatically listed.
・Use the elimination method by long-pressing the answer choices. Correct/incorrect answers and explanations for each statement, bookmarks and notes
- Practice exam with the same time and allocation as the actual exam (35 questions, 120 minutes). Results are judged according to the passing criteria, and scores for each subject are displayed.
- Prospects for passing, study calendar, consecutive study days, home screen widget, daily reminders
- Adjustable font size, dark theme, on tablets, questions and explanations are displayed side-by-side.

■ Passing Pack
Publicly released questions (updated June 2026), old publicly released questions (year unknown), and original Laws and Regulations 1 are available from the start. The Passing Pack unlocks access to all years, exams, and practice tests.

■ Caution
- This app is an independent learning app and is not affiliated with the Fire Service Examination Research Center. It does not represent any government agency or examination administering body.

* Official exam information (source): https://www.shoubo-shiken.or.jp/kikenbutsu/
* Published questions and correct answers: Fire Service Examination Research Center, General Incorporated Foundation, "Past Exam Questions" (Class B, Category 4)
* Laws and regulations may be amended. Please check the latest information provided by the examination administering body.
* Learning records are saved only on your device and will not be transmitted externally.

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