Fire Science Basics Test

Question 1

Wet wood is more difficult to ignite than dry wood. Wood wll be very difficult to ignite then when the moisture rises content above

Accepted Answer

15%

Answer

The moisture content of wood significantly impacts its flammability. As moisture increases, more heat energy is required to evaporate the water before the wood itself can reach its ignition temperature. Wood becomes very difficult to ignite and sustain combustion when its moisture content rises above approximately 15%, as the water acts as a heat sink.

Question 2

Which of the following selection is an example of plant fiber?

Accepted Answer

Cotton

Answer

Plant fibers are natural fibers derived directly from plants. Cotton is a prime example, as it is a soft, fluffy staple fiber that grows in a boll around the seeds of cotton plants, primarily composed of cellulose. In contrast, wool and mohair are animal fibers, and rayon is a manufactured fiber.

Question 3

Combustible metals are classified as what type fuels?

Accepted Answer

Class D

Answer

In fire classification systems, such as those established by NFPA, combustible metals are categorized as Class D fuels. These include metals like magnesium, titanium, zirconium, sodium, and potassium, which burn at extremely high temperatures and require specialized extinguishing agents, often dry powders, as water can react violently with them.

Question 4

Liquids that burn are classified as what type of fuels

Accepted Answer

Class B

Answer

According to standard fire classification systems, fires involving flammable or combustible liquids and gases are classified as Class B fires. Examples include gasoline, oil, alcohol, propane, and natural gas. These fires are typically extinguished by removing oxygen or inhibiting the chemical chain reaction.

Question 5

A liquid is classified as combustible if its flash point is

Accepted Answer

100°F or more

Answer

A liquid is classified as combustible if its flash point is 100°F (37.8°C) or higher. The flash point is the lowest temperature at which a liquid gives off enough vapor to form an ignitable mixture with air near its surface. Liquids with flash points below 100°F are classified as flammable.

Uncategorized Practice Test

Uncategorized Practice Test

Fire Science Basics Test