TEST BANK | Cosmetology Practice Questions
Mega Pack 2026 | 400+ Questions with Verified
Answers | Hair Chemistry, Salon Safety &
Infection Control
TEST BANK | Cosmetology Practice Questions Mega Pack
400+ Questions with Verified Answers | Hair Chemistry, Salon Safety & Infection
Control
Q1. What is the chemical symbol for hydrogen peroxide used in cosmetology?
A. H₂O B. H₂O₂ C. HO₂ D. H₃O E. H₂SO₄
CORRECT ANSWER: B. H₂O₂ RATIONALE: Hydrogen peroxide is chemically
written as H₂O₂, meaning two hydrogen atoms bonded to two oxygen atoms. It is the
most common oxidizing agent used in hair coloring and chemical services.
Q2. What is the pH range of hair?
A. 1.0–3.0 B. 3.5–4.0 C. 4.5–5.5 D. 6.0–7.0 E. 7.5–9.0
CORRECT ANSWER: C. 4.5–5.5 RATIONALE: Healthy hair has a slightly
acidic pH of 4.5–5.5. This slightly acidic environment keeps the cuticle closed, the hair
strong, and helps maintain its integrity.
Q3. Which part of the hair shaft contains the pigment (melanin)?
A. Cuticle B. Medulla C. Cortex D. Papilla E. Sebaceous gland
CORRECT ANSWER: C. Cortex RATIONALE: The cortex is the middle layer of
the hair shaft and contains melanin, the pigment responsible for natural hair color. It
also gives hair its strength and elasticity.
Q4. What is the outermost layer of the hair shaft called?
A. Medulla B. Cortex C. Follicle D. Cuticle E. Papilla
, CORRECT ANSWER: D. Cuticle RATIONALE: The cuticle is the outermost
protective layer of the hair shaft, composed of overlapping scale-like cells. It protects
the inner layers and determines the hair's shine and smoothness.
Q5. What type of bond is broken during a permanent wave?
A. Hydrogen bonds B. Salt bonds C. Peptide bonds D. Disulfide bonds E. Van der
Waals bonds
CORRECT ANSWER: D. Disulfide bonds RATIONALE: During a permanent
wave, the reducing agent (waving lotion) breaks the disulfide bonds in the cortex. These
bonds are then reformed in a new configuration by the neutralizer, giving hair its new
shape.
Q6. What is the purpose of a neutralizer in a permanent wave service?
A. To soften the hair cuticle B. To break disulfide bonds C. To re-form disulfide bonds
and stop the waving process D. To add moisture to the hair E. To lower the pH of the
hair
CORRECT ANSWER: C. To re-form disulfide bonds and stop the waving
process RATIONALE: The neutralizer in a perm service uses an oxidizing agent
(usually hydrogen peroxide or sodium bromate) to re-form the disulfide bonds in their
new position, locking in the curl pattern and stopping the chemical process.
Q7. What is the pH scale range?
A. 0–7 B. 1–10 C. 0–14 D. 1–14 E. 0–10
CORRECT ANSWER: C. 0–14 RATIONALE: The pH scale ranges from 0 to 14.
Values below 7 are acidic, 7 is neutral, and values above 7 are alkaline (basic). This
scale is logarithmic, meaning each unit represents a tenfold change.
Q8. Which type of melanin is responsible for red and yellow hair tones?
A. Eumelanin B. Pheomelanin C. Neuromelanin D. Carotene E. Keratin
, CORRECT ANSWER: B. Pheomelanin RATIONALE: Pheomelanin produces
red, yellow, and orange tones in hair. Eumelanin, by contrast, produces brown and black
tones. The ratio of these two pigments determines natural hair color.
Q9. What is the primary protein that makes up the hair shaft?
A. Collagen B. Elastin C. Keratin D. Melanin E. Fibrin
CORRECT ANSWER: C. Keratin RATIONALE: Keratin is the primary structural
protein of hair, nails, and the outer layer of skin. Hair is approximately 88% keratin,
composed of long chains of amino acids linked by various chemical bonds.
Q10. What is the term for the measurement of the number of hairs per square inch
on the scalp?
A. Hair texture B. Hair porosity C. Hair elasticity D. Hair density E. Hair growth rate
CORRECT ANSWER: D. Hair density RATIONALE: Hair density refers to the
number of individual hair strands per square inch of scalp. It is classified as low,
medium, or high and is an important factor in chemical service and styling decisions.
Q11. Which layer of the skin contains the hair follicle?
A. Epidermis B. Stratum corneum C. Dermis D. Hypodermis E. Stratum lucidum
CORRECT ANSWER: C. Dermis RATIONALE: The hair follicle is located in the
dermis (true skin), the second layer of skin. The follicle is a tube-like structure that
anchors the hair and contains the hair bulb where growth occurs.
Q12. What does the term "porosity" refer to in hair analysis?
A. The thickness of the individual hair strand B. The ability of hair to stretch and return
to its original length C. The ability of hair to absorb and retain moisture D. The number
of hairs per square inch E. The natural growth direction of hair
CORRECT ANSWER: C. The ability of hair to absorb and retain moisture
RATIONALE: Hair porosity describes how well hair can absorb and hold moisture and
chemicals. High porosity hair absorbs quickly but also loses moisture fast; low porosity
hair resists absorption. Porosity is determined by the condition of the cuticle layer.
, Q13. What is the chemical process that occurs when an oxidative hair color
develops?
A. Reduction B. Hydrolysis C. Oxidation D. Saponification E. Neutralization
CORRECT ANSWER: C. Oxidation RATIONALE: Oxidative hair color relies on
oxidation, a chemical reaction where hydrogen peroxide (the developer) releases
oxygen. This oxygen oxidizes the color precursors, causing them to develop into larger,
permanent color molecules inside the cortex.
Q14. What is the term for the natural oil produced by the sebaceous gland?
A. Keratin B. Melanin C. Sebum D. Collagen E. Lipid
CORRECT ANSWER: C. Sebum RATIONALE: Sebum is the natural oil
secreted by the sebaceous glands. It lubricates and conditions the hair and scalp, helps
maintain the slightly acidic pH, and provides a protective barrier against bacteria.
Q15. Which of the following best describes "elasticity" in hair analysis?
A. The amount of moisture the hair contains B. The diameter of the hair strand C. The
ability of hair to stretch and return to its original length D. The wave pattern of hair E.
The degree of shine in the hair
CORRECT ANSWER: C. The ability of hair to stretch and return to its original
length RATIONALE: Hair elasticity is the ability of hair to stretch under tension and
spring back to its original length when released. Healthy hair can stretch up to 50% of
its length when wet. Poor elasticity indicates weakened disulfide bonds and structural
damage.
Q16. What is the anagen phase of hair growth?
A. The resting phase B. The transition phase C. The active growth phase D. The
shedding phase E. The dormant phase
CORRECT ANSWER: C. The active growth phase RATIONALE: The anagen
phase is the active growth stage of the hair cycle during which cells in the hair bulb
divide rapidly and produce new hair. This phase can last 2–7 years and determines the
maximum length hair can grow.
Mega Pack 2026 | 400+ Questions with Verified
Answers | Hair Chemistry, Salon Safety &
Infection Control
TEST BANK | Cosmetology Practice Questions Mega Pack
400+ Questions with Verified Answers | Hair Chemistry, Salon Safety & Infection
Control
Q1. What is the chemical symbol for hydrogen peroxide used in cosmetology?
A. H₂O B. H₂O₂ C. HO₂ D. H₃O E. H₂SO₄
CORRECT ANSWER: B. H₂O₂ RATIONALE: Hydrogen peroxide is chemically
written as H₂O₂, meaning two hydrogen atoms bonded to two oxygen atoms. It is the
most common oxidizing agent used in hair coloring and chemical services.
Q2. What is the pH range of hair?
A. 1.0–3.0 B. 3.5–4.0 C. 4.5–5.5 D. 6.0–7.0 E. 7.5–9.0
CORRECT ANSWER: C. 4.5–5.5 RATIONALE: Healthy hair has a slightly
acidic pH of 4.5–5.5. This slightly acidic environment keeps the cuticle closed, the hair
strong, and helps maintain its integrity.
Q3. Which part of the hair shaft contains the pigment (melanin)?
A. Cuticle B. Medulla C. Cortex D. Papilla E. Sebaceous gland
CORRECT ANSWER: C. Cortex RATIONALE: The cortex is the middle layer of
the hair shaft and contains melanin, the pigment responsible for natural hair color. It
also gives hair its strength and elasticity.
Q4. What is the outermost layer of the hair shaft called?
A. Medulla B. Cortex C. Follicle D. Cuticle E. Papilla
, CORRECT ANSWER: D. Cuticle RATIONALE: The cuticle is the outermost
protective layer of the hair shaft, composed of overlapping scale-like cells. It protects
the inner layers and determines the hair's shine and smoothness.
Q5. What type of bond is broken during a permanent wave?
A. Hydrogen bonds B. Salt bonds C. Peptide bonds D. Disulfide bonds E. Van der
Waals bonds
CORRECT ANSWER: D. Disulfide bonds RATIONALE: During a permanent
wave, the reducing agent (waving lotion) breaks the disulfide bonds in the cortex. These
bonds are then reformed in a new configuration by the neutralizer, giving hair its new
shape.
Q6. What is the purpose of a neutralizer in a permanent wave service?
A. To soften the hair cuticle B. To break disulfide bonds C. To re-form disulfide bonds
and stop the waving process D. To add moisture to the hair E. To lower the pH of the
hair
CORRECT ANSWER: C. To re-form disulfide bonds and stop the waving
process RATIONALE: The neutralizer in a perm service uses an oxidizing agent
(usually hydrogen peroxide or sodium bromate) to re-form the disulfide bonds in their
new position, locking in the curl pattern and stopping the chemical process.
Q7. What is the pH scale range?
A. 0–7 B. 1–10 C. 0–14 D. 1–14 E. 0–10
CORRECT ANSWER: C. 0–14 RATIONALE: The pH scale ranges from 0 to 14.
Values below 7 are acidic, 7 is neutral, and values above 7 are alkaline (basic). This
scale is logarithmic, meaning each unit represents a tenfold change.
Q8. Which type of melanin is responsible for red and yellow hair tones?
A. Eumelanin B. Pheomelanin C. Neuromelanin D. Carotene E. Keratin
, CORRECT ANSWER: B. Pheomelanin RATIONALE: Pheomelanin produces
red, yellow, and orange tones in hair. Eumelanin, by contrast, produces brown and black
tones. The ratio of these two pigments determines natural hair color.
Q9. What is the primary protein that makes up the hair shaft?
A. Collagen B. Elastin C. Keratin D. Melanin E. Fibrin
CORRECT ANSWER: C. Keratin RATIONALE: Keratin is the primary structural
protein of hair, nails, and the outer layer of skin. Hair is approximately 88% keratin,
composed of long chains of amino acids linked by various chemical bonds.
Q10. What is the term for the measurement of the number of hairs per square inch
on the scalp?
A. Hair texture B. Hair porosity C. Hair elasticity D. Hair density E. Hair growth rate
CORRECT ANSWER: D. Hair density RATIONALE: Hair density refers to the
number of individual hair strands per square inch of scalp. It is classified as low,
medium, or high and is an important factor in chemical service and styling decisions.
Q11. Which layer of the skin contains the hair follicle?
A. Epidermis B. Stratum corneum C. Dermis D. Hypodermis E. Stratum lucidum
CORRECT ANSWER: C. Dermis RATIONALE: The hair follicle is located in the
dermis (true skin), the second layer of skin. The follicle is a tube-like structure that
anchors the hair and contains the hair bulb where growth occurs.
Q12. What does the term "porosity" refer to in hair analysis?
A. The thickness of the individual hair strand B. The ability of hair to stretch and return
to its original length C. The ability of hair to absorb and retain moisture D. The number
of hairs per square inch E. The natural growth direction of hair
CORRECT ANSWER: C. The ability of hair to absorb and retain moisture
RATIONALE: Hair porosity describes how well hair can absorb and hold moisture and
chemicals. High porosity hair absorbs quickly but also loses moisture fast; low porosity
hair resists absorption. Porosity is determined by the condition of the cuticle layer.
, Q13. What is the chemical process that occurs when an oxidative hair color
develops?
A. Reduction B. Hydrolysis C. Oxidation D. Saponification E. Neutralization
CORRECT ANSWER: C. Oxidation RATIONALE: Oxidative hair color relies on
oxidation, a chemical reaction where hydrogen peroxide (the developer) releases
oxygen. This oxygen oxidizes the color precursors, causing them to develop into larger,
permanent color molecules inside the cortex.
Q14. What is the term for the natural oil produced by the sebaceous gland?
A. Keratin B. Melanin C. Sebum D. Collagen E. Lipid
CORRECT ANSWER: C. Sebum RATIONALE: Sebum is the natural oil
secreted by the sebaceous glands. It lubricates and conditions the hair and scalp, helps
maintain the slightly acidic pH, and provides a protective barrier against bacteria.
Q15. Which of the following best describes "elasticity" in hair analysis?
A. The amount of moisture the hair contains B. The diameter of the hair strand C. The
ability of hair to stretch and return to its original length D. The wave pattern of hair E.
The degree of shine in the hair
CORRECT ANSWER: C. The ability of hair to stretch and return to its original
length RATIONALE: Hair elasticity is the ability of hair to stretch under tension and
spring back to its original length when released. Healthy hair can stretch up to 50% of
its length when wet. Poor elasticity indicates weakened disulfide bonds and structural
damage.
Q16. What is the anagen phase of hair growth?
A. The resting phase B. The transition phase C. The active growth phase D. The
shedding phase E. The dormant phase
CORRECT ANSWER: C. The active growth phase RATIONALE: The anagen
phase is the active growth stage of the hair cycle during which cells in the hair bulb
divide rapidly and produce new hair. This phase can last 2–7 years and determines the
maximum length hair can grow.
