危険物乙４　一問一答

App for preparing for the Class B Class 4 Hazardous Materials Operator Examination. Ranked #1 in the Otsu 4 learning app on iOS!
A large volume with a total of over 400 questions! You can pass with just this app! ? Many achievements!

◎Cumulatively over 75,000 downloads on iOS! The cumulative total of the series has exceeded 400,000 downloads! ! The app that received overwhelming support among Otsu 4 learning apps is now available on Android! !
◎Many successful results using the app!
◎The actual exam for Hazardous Materials Handler Otsu 4 has five multiple-choice questions, but by breaking it down into a question-and-answer format, you can learn more precisely and in detail!
◎One question and one answer, perfect for short study periods such as during free time.
◎All questions come with detailed explanations, so you can study without the textbook.
◎You can memorize questions that are easy to get wrong and focus on studying questions that you are weak at, so you can study efficiently.

[What is a hazardous materials handler]
Hazardous materials handler is a national qualification required to handle substances (dangerous materials) that have a high risk of causing fire as specified in the Fire Service Act.
This qualification is divided into "Class A", "Class Otsu", and "Class C", and "Class Otsu" is further divided into categories 1 to 6. Among them, "Dangerous Goods Handler Class 4 (commonly known as Hazardous Materials Otsu 4)" includes commonly handled kerosene, gasoline, etc., and it is said that about 80% of all dangerous materials are included in this Hazardous Materials Handler Class 4. For this reason, it is the most in-demand qualification among hazardous materials handlers, and is said to be an advantageous qualification for part-time work at gas stations, employment, and career changes.

This app is created in a question-and-answer format, dividing the questions into three areas: ``Laws and Regulations Regarding Hazardous Materials,'' ``Basic Physics and Chemistry,'' and ``The Properties of Hazardous Materials and Their Fire Prevention and Extinguishing Methods,'' in accordance with the question format of the actual Hazardous Materials Engineer Otsu 4 exam.

Although Dangerous Goods Handler Otsu 4 is a national qualification, there are no restrictions on eligibility to take the exam, and the youngest person to pass is a second-year elementary school student, so it can be said that it is a national qualification that is relatively easy to pass if you have sufficient memorization skills. Also, depending on the venue, it is held more than 10 times a year, making it a very easy qualification to take.

In this app, we research and analyze past exam questions for Dangerous Goods Handler Otsu 4, carefully select questions, and implement a memorization mode and extraction function for weak questions to help you memorize more efficiently.It is designed to help you get closer to passing the exam in the shortest possible time.

[Advantages of obtaining Hazardous Materials Handler Otsu 4 certification]
The following are typical substances that can be handled by obtaining Hazardous Materials Handler Otsu 4 certification.
·gasoline
·kerosene
・Diesel oil
·heavy oil
·alcohol
・Lubricating oil such as gear oil
These substances are used everywhere in the world, so this qualification is in demand at various workplaces such as gas stations, various factories, and building management, and it is a qualification that is directly linked to employment and promotion, which is why the Hazardous Materials Handler Otsu 4 is a popular qualification.

We hope that this app will help you improve your future career by acquiring the Hazardous Materials Handler Otsu 4 qualification.

[Characteristics of this app]
There are three types: problem mode, quiz mode, and memorization mode (*), and you can study Dangerous Goods Handler Otsu 4 according to the situation.
(*) In memorization mode, you can hide important parts and memorize them like a "red check sheet".
The Hazardous Materials Handler Otsu 4 exam consists of the following 3 areas, and with this app, you can choose your favorite (or weaker) subject from the 3 areas to study. (1. Laws and regulations regarding hazardous materials, 2. Basic physics and chemistry, 3. Properties of hazardous materials and their fire prevention and extinguishing methods)
In addition, you can choose from three types of question formats: (1) all questions, (2) only checked questions, and (3) only questions you are weak at, allowing you to study Hazardous Materials 4 efficiently.　

[Explanation of each mode]
■“Problem” mode
Choose your favorite field from the three areas covered by Hazardous Materials Handler Otsu 4 (1. Laws and regulations related to hazardous materials, 2. Basic physics/chemistry, 3. Properties of hazardous materials and fire prevention/extinguishing methods) and solve the problem.
In this mode, incorrect questions are automatically checked and you can solve them again using the "Checked questions" format. (You can also manually check the questions you answered correctly.)
After you have solved all the questions, you can review them by clicking "Check the questions you got wrong." (Click "v" to check your answer.)

■“Quiz” mode
We will randomly ask 30 questions from all three areas of Hazardous Materials Handler Otsu 4.
Your best grades for the day are recorded and can be checked using the "Grade" button, so you can study while feeling your daily progress.

■“Memorization” mode
In memorization mode, you can memorize important words by hiding them, just like with a "red check sheet". Also, like the "Problem" mode, you can select "Only checked questions or Only questions you are weak at", allowing for efficient memorization.

■“Settings” mode
-By setting the test date for Hazardous Materials Handler Otsu 4, the number of days until the test date will be displayed, allowing you to study systematically.
- It has a reminder function and allows you to set the time and day of the week for notifications, contributing to continuous learning.