# Hazmat Class B4 Exam Prep JP — Practice Questions & Answers

> Practice Questions & Answers (iPhone/iPad app by Ryouhei Azuma.)

- Source: https://appshunter.io/ios/app/hazmat-class-b4-exam-prep-jp/id6782099051 (this page in markdown: same URL + `.md`)
- Developer: [Ryouhei Azuma](https://appshunter.io/developer/1353297781)
- Category: Business, Magazines & Newspapers
- Price: Free
- Age rating: 4+
- Requires: iOS 16 · 15 MB
- Languages: American English
- Released: 2026-06-23
- Data updated: 2026-08-25
- User reviews in markdown: https://appshunter.io/ios/app/hazmat-class-b4-exam-prep-jp/id6782099051/reviews.md

## What is Hazmat Class B4 Exam Prep JP?

A study app for the Japan Hazardous Materials Handler (Class B-4 / Otsu-4) exam. Study efficiently with practice questions and detailed explanations across all 3 subjects.

■ Subjects Covered
• Laws and regulations on hazardous materials
• Basic physics and basic chemistry
• Properties of hazardous materials, fire prevention, and extinguishing methods

■ Study Modes
• Random practice (10 / 25 / 50 / 100 questions)
• Study by subject
• All questions in order (resume supported)
• Review incorrect answers
• Bookmarks and unanswered questions

■ Progress Tracking
• Automatic tracking of correct answer rate
• Subject-by-subject performance overview

Works completely offline — study anytime, anywhere.

■ Reference Sources
• Fire and Disaster Management Agency https://www.fdma.go.jp/
• Center for Fire and Disaster Prevention, Testing Division https://www.shoubo-shiken.or.jp/

※ This app is an independent study tool and is not affiliated with any examination body.


## Version history (last 2 releases)

### 1.1 — 2026-07-22

Minor fixes.

### 1.0 — 2026-06-24

No release notes.

## More apps by Ryouhei Azuma

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- [Blackboard - Simple](https://appshunter.io/ios/app/blackboard-simple/id1600026235)
- [Drawing Pad - Blackboard style](https://appshunter.io/ios/app/drawing-pad-blackboard-style/id1600254502)

All apps by Ryouhei Azuma: https://appshunter.io/developer/1353297781

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*