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Hazardous Materials Otsu-4 | Eligibility, Classification, and Designated Quantities

1 / 100.0s

Problem 1

Which statement correctly describes eligibility for a first-time candidate taking Japan's Class B Category 4 hazardous materials examination?

View explanation

Anyone may take a Class B or Class C examination. Specified academic or professional qualifications are required for the Class A examination.

Problem 2

What category name does Japan's Fire Service Act assign to Category 4 hazardous materials?

View explanation

Category 4 consists of flammable liquids. Flammable solids are Category 2, oxidizing solids are Category 1, and oxidizing liquids are Category 6.

Problem 3

Which group consists entirely of examples listed under Category 4 in the official examination guide?

View explanation

Gasoline, kerosene, and diesel oil are all listed as Category 4 examples. Potassium and yellow phosphorus are Category 3; hydrogen peroxide and nitric acid are Category 6; and red phosphorus and sulfur are Category 2.

Problem 4

Under which category is hydrogen peroxide listed as a representative example?

View explanation

Hydrogen peroxide is listed as an example of a Category 6 oxidizing liquid. Being a liquid does not automatically place a substance in Category 4.

Problem 5

Assume the standard Class B hazardous materials examination with no subject exemptions.

How many questions cover hazardous-materials regulations?

View explanation

The standard Class B examination has 15 regulation questions, 10 basic physics and chemistry questions, and 10 questions on properties, fire prevention, and extinguishing.

Problem 6

Assume the standard Class B hazardous materials examination with no subject exemptions.

How many questions are there across all three subjects?

View explanation

The total is 35: 15 on regulations, 10 on basic physics and chemistry, and 10 on properties, fire prevention, and extinguishing.

Problem 7

A candidate already holds a Class B Category 2 hazardous materials license and applies for the prescribed subject exemptions when taking Category 4.

Which subject and question-count combination will this candidate take?

View explanation

With the exemption for a holder of another Class B category, regulations and basic physics and chemistry are fully exempt. The candidate takes 10 questions on the properties, fire prevention, and extinguishing methods for the category being sought.

Problem 8

What designated quantity does the Order for Enforcement of the Fire Service Act set for special flammable substances?

View explanation

The designated quantity for special flammable substances is 50 litres. For Class I petroleum, it is 200 litres for water-insoluble liquids and 400 litres for water-soluble liquids.

Problem 9

Which pair of designated quantities for Class I petroleum is correct?

View explanation

For Class I petroleum, the designated quantity is 200 litres for a water-insoluble liquid and 400 litres for a water-soluble liquid. The 1,000- and 2,000-litre figures apply to Class II petroleum.

Problem 10

One location stores 100 litres of water-insoluble Class I petroleum, 500 litres of water-insoluble Class II petroleum, and 200 litres of alcohols.

What is the sum of the designated-quantity multiples?

View explanation

Class I petroleum contributes 100 ÷ 200 = 0.5, Class II petroleum contributes 500 ÷ 1,000 = 0.5, and alcohols contribute 200 ÷ 400 = 0.5. The sum is 1.5 times the designated quantity.