Cosmetology Test Scientific Concepts 4

Question 1

Which pigment gives hair its color and is produced by melanocytes?

Accepted Answer

Melanin

Answer

Melanin is the pigment produced by melanocytes in the hair bulb that determines natural hair color.

Question 2

What is the term for the ability of the hair to absorb and retain moisture?

Accepted Answer

Porosity

Answer

Porosity refers to the hair's ability to absorb and hold moisture, determined by the condition of the cuticle layer.

Question 3

Which part of the electromagnetic spectrum is responsible for causing sunburn?

Accepted Answer

Ultraviolet rays

Answer

Ultraviolet (UV) rays from the sun penetrate the skin and cause sunburn, premature aging, and increased risk of skin cancer.

Question 4

What is the primary purpose of a conditioner's acidic pH (4.5–5.5)?

Accepted Answer

To close the cuticle and smooth the hair

Answer

The slightly acidic pH of conditioners causes the cuticle scales to contract and lie flat, resulting in smooth, shiny hair.

Question 5

What does the term 'volatile' mean when describing a chemical used in cosmetology?

Accepted Answer

Easily evaporates at room temperature

Answer

A volatile substance evaporates quickly at room temperature, which is important when working with solvents and nail products.

Cosmetology Test Practice Test