Cosmetology Test Scientific Concepts 4 — Questions and Answers
Question 1: Which pigment gives hair its color and is produced by melanocytes?
- Keratin
- Collagen
- Melanin (Correct answer)
- Sebum
Correct answer: Melanin
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?
- Elasticity
- Porosity (Correct answer)
- Texture
- Density
Correct answer: Porosity
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?
- Infrared rays
- Visible light
- Ultraviolet rays (Correct answer)
- Radio waves
Correct answer: Ultraviolet rays
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)?
- To open the cuticle for deep penetration
- To close the cuticle and smooth the hair (Correct answer)
- To activate the color developer
- To break disulfide bonds
Correct answer: To close the cuticle and smooth the hair
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?
- Highly reactive with metals
- Easily evaporates at room temperature (Correct answer)
- Resistant to chemical change
- Highly alkaline in nature
Correct answer: Easily evaporates at room temperature
A volatile substance evaporates quickly at room temperature, which is important when working with solvents and nail products.
Question 6: The arrector pili muscle is responsible for which skin phenomenon?
- Sebum production
- Sweating
- Goosebumps (Correct answer)
- Skin pigmentation
Correct answer: Goosebumps
The arrector pili is a tiny muscle attached to each hair follicle that contracts in response to cold or fear, causing goosebumps.
Question 7: Which type of water hardness is caused by dissolved calcium and magnesium bicarbonates that can be removed by boiling?
- Permanent hardness
- Temporary hardness (Correct answer)
- Mineral hardness
- Chemical hardness
Correct answer: Temporary hardness
Temporary hardness is caused by calcium and magnesium bicarbonates, which precipitate out when water is boiled.
Cosmetology Test Scientific Concepts 4
Which pigment gives hair its color and is produced by melanocytes?