Prepare for the Class 4 Hazardous Materials Handler national qualification exam with this Q&A app. It offers over 1200 questions with explanations across laws, physics, chemistry, and properties, plus mock exams. Track your progress and study offline.
2.0.1
June 9, 2026
アプリ体験の改善と内部計測の精度向上を行いました。学習を継続しやすくするための更新です。
ご利用いただきありがとうございます。また、ご指摘をいただきとても助かります。 本アプリには「法令」「物理化学」「性質と消火」の3科目あわせて計700問を収録しております。 ただ現状、無料でお試しいただける範囲を「法令」カテゴリのみに絞っていたため、収録量が実際より少なく見えてしまっていたかと存じます。大変申し訳ございません。 次回アップデートでは、「物理化学」「性質と消火」の各分野も無料でお試しいただけるよう改善を予定しております。 改善後に、あらためてご利用いただけますと幸いです。今後ともよろしくお願いいたします。
危険物乙4 (Kikenbutsu Otsu 4) is a national qualification exam that tests knowledge related to handling Class 4 hazardous materials, such as gasoline, kerosene, and alcohol. This app helps users prepare for this specific certification.
The exam covers three main areas: laws related to hazardous materials, basic physics and chemistry, and the properties of hazardous materials along with fire prevention and extinguishing methods. This app provides questions for all these subjects.
The app features a total of 1200 questions with explanations. These are divided into 520 questions on laws, 340 on physics and chemistry, and 340 on properties and fire extinguishing. It also includes 10 mock exams.
Yes, the app supports offline study. This allows you to practice questions and review material without an internet connection, making it convenient for studying during commutes or in areas with limited connectivity.
The app visualizes your learning progress and correct answer rates using graphs. This feature helps you identify areas where you need more practice and monitor your improvement over time.
The app is free to download and use, but some categories and mock exams are available through in-app purchases. You can find details about these purchases within the app's guidance section.
The app was last updated on 2026-06-09, indicating active development. While specific update frequency isn't detailed, the recent update suggests ongoing support and potential improvements.
This app has an age rating of 4+. It is designed for users who are studying for a national qualification exam, which typically requires a minimum age for eligibility.
