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NE Cosmetology practice questions

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Question 1Scientific Concepts and Hair Care

Which layer of the hair shaft is the outermost, consists of overlapping flat cells, and protects the inner structures?

  1. Cuticle Correct answer.
  2. Papilla
  3. Medulla
  4. Cortex

Explanation

The cuticle is the tough outer layer made of overlapping, scale-like cells that shields the cortex and medulla from damage. Its condition determines how well hair holds moisture and resists chemical and mechanical stress.

Question 2Scientific Concepts and Hair Care

Keratin is a protein built from chains of amino acids. Which bond type is primarily responsible for the strength and elasticity of the hair's coiled keratin structure?

  1. Peptide bonds
  2. Hydrogen bonds
  3. Disulfide bonds Correct answer.
  4. Salt bonds

Explanation

Disulfide bonds are strong covalent cross-links between cysteine amino acids that give keratin its resilience and shape memory. They can only be broken by chemical relaxers or perms, unlike weaker hydrogen and salt bonds.

Question 3Scientific Concepts and Hair Care

A client's hair is described as having low porosity. Which characteristic best matches this classification?

  1. The hair contains no cortex and cannot hold color.
  2. The cuticle is tightly closed and resists moisture absorption. Correct answer.
  3. The hair has no cuticle layer at all.
  4. The cuticle is raised and absorbs moisture quickly.

Explanation

Low-porosity hair has a tightly layered cuticle that repels water and resists absorbing products. Treatments and color may need heat or longer processing to penetrate.

Question 4Scientific Concepts and Hair Care

Which of the following best describes the anagen phase of the hair growth cycle?

  1. The active growth phase when cells divide rapidly. Correct answer.
  2. The transitional phase when growth stops.
  3. The phase when the follicle produces sebum only.
  4. The resting phase when the hair sheds.

Explanation

Anagen is the active growth phase, during which cells in the hair bulb divide rapidly and the hair lengthens. It is the longest phase and determines how long hair can grow before entering catagen and telogen.

Question 5Scientific Concepts and Hair Care

A stylist is choosing a shampoo for a client with an oily scalp and fine hair. Which formulation is most appropriate?

  1. A color-depositing shampoo used daily
  2. A clarifying or balancing shampoo for oily scalp Correct answer.
  3. A moisturizing shampoo for dry, coarse hair
  4. A heavy cream shampoo with added oils

Explanation

A clarifying or balancing shampoo removes excess sebum and product buildup without weighing down fine hair. Heavy or oil-rich formulas would make fine, oily hair limp and greasy.

Question 6Scientific Concepts and Hair Care

What is the primary function of the arrector pili muscle in the hair follicle?

  1. To supply blood to the hair bulb
  2. To contract and cause the hair to stand upright Correct answer.
  3. To produce melanin for hair color
  4. To secrete sebum into the follicle

Explanation

The arrector pili is a small muscle attached to the follicle that contracts in response to cold or emotion, raising the hair and creating goose bumps. It does not produce pigment, oil, or blood.

Question 7Scientific Concepts and Hair Care

A client with very curly hair wants a smooth, straight result. Which chemical process permanently restructures the hair?

  1. Brushing with a boar-bristle brush
  2. Using a temporary color rinse
  3. Applying a hydroxide relaxer Correct answer.
  4. Shampooing with a volumizing formula

Explanation

A hydroxide relaxer breaks disulfide bonds and re-forms them in a straighter configuration, producing a permanent change. The other options are temporary or cosmetic and do not alter the hair's internal bonds.

Question 8Scientific Concepts and Hair Care

Which statement accurately describes the difference between a primary and a secondary color in hair coloring theory?

  1. Primary colors are mixed to create secondary colors. Correct answer.
  2. Primary colors are only used for toning.
  3. Secondary colors are the purest colors available.
  4. Secondary colors cannot be used on hair.

Explanation

Primary colors (red, yellow, blue) are pure and cannot be created by mixing; combining two primaries produces a secondary color such as green, orange, or violet. This principle guides formulation and color correction.

Question 9Scientific Concepts and Hair Care

A client's hair shows breakage and feels brittle after repeated lightening. Which structural component has most likely been compromised?

  1. The cuticle and cortex integrity Correct answer.
  2. The hair bulb
  3. The follicle sheath
  4. The sebaceous gland

Explanation

Repeated lightening lifts the cuticle and damages the cortex, reducing tensile strength and causing breakage. The follicle and glands are below the skin and are not affected by surface chemical damage.

Question 10Scientific Concepts and Hair Care

Which of the following is the correct definition of pH as it applies to hair care products?

  1. The measure of acidity or alkalinity on a scale of 0 to 14 Correct answer.
  2. The measure of water content in a product
  3. The measure of a product's color intensity
  4. The measure of a product's ability to lather

Explanation

pH measures hydrogen ion concentration on a scale from 0 (acidic) to 14 (alkaline), with 7 neutral. Hair and scalp prefer slightly acidic products because they keep the cuticle compact.

Question 11Scientific Concepts and Hair Care

A shampoo with a pH of 3.5 would be classified as which of the following?

  1. Strongly alkaline
  2. Acidic Correct answer.
  3. Alkaline
  4. Neutral

Explanation

A pH below 7 is acidic, so 3.5 is acidic. Acidic shampoos help close the cuticle and are often used after alkaline services.

Question 12Scientific Concepts and Hair Care

Which of the following best explains why hair becomes lighter when hydrogen peroxide is applied?

  1. It oxidizes melanin, reducing pigment in the cortex. Correct answer.
  2. It coats the hair with a lighter pigment.
  3. It adds moisture that reflects light.
  4. It removes the cuticle layer entirely.

Explanation

Hydrogen peroxide releases oxygen that oxidizes melanin in the cortex, reducing pigment and lightening the hair. It does not simply coat the hair or remove the cuticle.

Question 13Scientific Concepts and Hair Care

Which type of hair is generally the most fragile and requires the gentlest handling?

  1. Gray hair
  2. Fine hair Correct answer.
  3. Medium hair
  4. Coarse hair

Explanation

Fine hair has a smaller diameter and less cortex, making it more susceptible to breakage and chemical damage. It needs lower processing strength and gentle handling.

Question 14Scientific Concepts and Hair Care

A client reports scalp flaking with redness and itching. Which condition should the stylist recognize as potentially contagious and requiring medical referral?

  1. Dandruff
  2. Product buildup
  3. Dry scalp
  4. Tinea capitis Correct answer.

Explanation

Tinea capitis is a fungal infection of the scalp that is contagious and requires medical treatment. Stylists should not perform services on affected clients and should refer them to a physician.

Question 15Scientific Concepts and Hair Care

Which of the following is the correct order of the hair growth cycle?

  1. Anagen, catagen, telogen Correct answer.
  2. Telogen, anagen, catagen
  3. Catagen, telogen, anagen
  4. Anagen, telogen, catagen

Explanation

Hair grows in the sequence anagen (growth), catagen (transition), and telogen (rest and shedding). Understanding this order helps explain shedding and treatment timing.

Question 16Scientific Concepts and Hair Care

What is the primary role of the sebaceous gland in relation to the hair and scalp?

  1. To secrete sebum that lubricates hair and scalp Correct answer.
  2. To generate new hair cells
  3. To produce melanin
  4. To regulate body temperature

Explanation

The sebaceous gland secretes sebum, an oily substance that lubricates the hair and scalp and helps retain moisture. It does not produce pigment or new hair cells.

Question 17Scientific Concepts and Hair Care

A client with high-porosity hair receives a color service. Which adjustment is most appropriate to prevent overprocessing?

  1. Apply color to the scalp first and extend time.
  2. Shorten processing time and monitor closely. Correct answer.
  3. Skip the patch test.
  4. Increase developer strength significantly.

Explanation

High-porosity hair absorbs products quickly and can overprocess, so shortening processing time and monitoring closely prevents damage. Increasing strength or extending time would worsen the risk.

Question 18Scientific Concepts and Hair Care

Which statement about the cortex is accurate?

  1. It is the outermost layer of the hair.
  2. It contains melanin and provides strength and elasticity. Correct answer.
  3. It produces sebum.
  4. It is the living base of the follicle.

Explanation

The cortex is the middle layer that holds melanin granules and gives hair its strength, elasticity, and color. Damage here affects both color retention and structural integrity.

Question 19Scientific Concepts and Hair Care

Which of the following best explains why a temporary color rinse washes out over several shampoos?

  1. It oxidizes melanin inside the hair.
  2. It deposits large pigment molecules on the surface of the cuticle. Correct answer.
  3. It penetrates deeply into the cortex.
  4. It permanently breaks disulfide bonds.

Explanation

Temporary color uses large pigment molecules that sit on the cuticle surface and are removed by shampooing. It does not penetrate the cortex or alter bonds.

Question 20Scientific Concepts and Hair Care

Which ingredient is commonly used in antidandruff shampoos to reduce Malassezia-related flaking?

  1. Sodium chloride
  2. Citric acid
  3. Zinc pyrithione Correct answer.
  4. Glycerin

Explanation

Zinc pyrithione has antifungal properties that help control Malassezia, a yeast linked to dandruff. Sodium chloride, glycerin, and citric acid serve other formulation roles.

Question 21Scientific Concepts and Hair Care

A stylist is evaluating a client's hair for a relaxer service. Which factor would most strongly contraindicate the service?

  1. The client has virgin, coarse hair.
  2. The client uses a sulfate-free shampoo.
  3. The client has a history of scalp abrasions and recent color lightening. Correct answer.
  4. The client wants a smoother look.

Explanation

Scalp abrasions and recent lightening increase the risk of chemical burns and severe damage, so the service should be postponed or avoided. Virgin coarse hair and product choice do not contraindicate relaxing.

Question 22Scientific Concepts and Hair Care

Which of the following describes the function of a conditioner's cationic surfactants?

  1. They strip natural oils from the hair.
  2. They permanently straighten curl pattern.
  3. They bond to negatively charged hair, smoothing the cuticle. Correct answer.
  4. They lighten the hair's melanin.

Explanation

Cationic surfactants carry a positive charge and attach to negatively charged hair, reducing static and smoothing the cuticle. This improves manageability without permanent structural change.

Question 23Scientific Concepts and Hair Care

Which of the following best explains why hair appears darker when wet?

  1. Water permanently breaks disulfide bonds.
  2. Water adds pigment to the cortex.
  3. Water increases melanin production.
  4. Water fills spaces in the cuticle, reducing light reflection. Correct answer.

Explanation

Water fills the spaces between cuticle scales, creating a smoother surface that reflects less light, so hair looks darker. This is a temporary optical effect, not a pigment change.

Question 24Scientific Concepts and Hair Care

What is the primary purpose of a patch test before applying hair color?

  1. To determine the client's natural color level
  2. To select the developer strength
  3. To measure the hair's porosity
  4. To check for an allergic reaction to the formula Correct answer.

Explanation

A patch test detects potential allergic sensitivity to color products before full application. It does not determine color level, porosity, or developer choice.

Question 25Scientific Concepts and Hair Care

Which statement correctly describes the relationship between cuticle layers and hair porosity?

  1. Fewer cuticle layers generally increase porosity. Correct answer.
  2. More cuticle layers generally increase porosity.
  3. Porosity is determined only by hair color.
  4. Porosity is unrelated to cuticle structure.

Explanation

When cuticle layers are damaged or reduced, the hair becomes more porous and absorbs products unevenly. Intact, plentiful cuticle layers keep porosity low.

Question 26Scientific Concepts and Hair Care

Which layer of the hair shaft consists of a single overlapping layer of transparent, scale-like cells that protects the inner structures?

  1. Medulla
  2. Inner root sheath
  3. Cortex
  4. Cuticle Correct answer.

Explanation

The cuticle is the outermost layer of the hair shaft, made of overlapping transparent scales that shield the cortex and medulla. Its condition largely determines shine, porosity, and resistance to chemical services.

Question 27Scientific Concepts and Hair Care

A client with fine, limp hair wants more body without a permanent service. Which approach best supports that goal?

  1. Shampoo daily with a high-surfactant clarifying formula only
  2. Coat the hair with a thick leave-in cream and air dry
  3. Use a lightweight volumizing mousse on damp hair and lift at the root during blow-drying Correct answer.
  4. Apply a heavy oil-based pomade from scalp to ends

Explanation

Fine hair has a smaller diameter and is easily weighed down by heavy products. A lightweight styling foam plus root lift adds temporary body without coating the strand or adding weight.

Question 28Scientific Concepts and Hair Care

Which term describes the ability of hair to absorb moisture and substances through the cuticle?

  1. Elasticity
  2. Density
  3. Porosity Correct answer.
  4. Texture

Explanation

Porosity refers to how readily the hair absorbs and retains moisture, governed by the condition of the cuticle. Elasticity describes stretch and return, density describes strands per square inch, and texture describes diameter.

Question 29Scientific Concepts and Hair Care

Which of the following is a natural pigment found in the cortex that contributes to hair color?

  1. Sebum
  2. Melanin Correct answer.
  3. Keratin
  4. Collagen

Explanation

Melanin is the pigment produced by melanocytes and deposited in the cortex, giving hair its natural color. Keratin is structural protein, sebum is scalp oil, and collagen is not a hair pigment.

Question 30Scientific Concepts and Hair Care

What is the primary purpose of the anagen phase of the hair growth cycle?

  1. Active growth and keratin production Correct answer.
  2. Loosening of the club hair from the follicle
  3. Shedding of the old hair fiber
  4. Resting of the follicle before shedding

Explanation

Anagen is the active growth phase in which cells in the follicle divide rapidly and build the hair shaft. Catagen is the transition, and telogen is the resting phase that ends with shedding.

Question 31Scientific Concepts and Hair Care

Which hair texture is characterized by the smallest diameter strand and generally holds less moisture?

  1. Medium
  2. Coarse
  3. Fine Correct answer.
  4. Wiry

Explanation

Fine hair has the smallest diameter, which makes it appear less dense and feel more delicate. Because the strand is thin, it often loses moisture quickly and is easily damaged by chemicals.

Question 32Scientific Concepts and Hair Care

Which product ingredient is designed to lower the surface tension of water so that shampoo can wet the hair and lift oils?

  1. Surfactant Correct answer.
  2. Cationic polymer
  3. Silicone
  4. Humectant

Explanation

Surfactants lower surface tension and allow water to spread and lift oils and debris from the hair and scalp. Humectants attract moisture, cationic polymers condition, and silicones add shine and slip.

Question 33Scientific Concepts and Hair Care

A client with a dry, flaky scalp asks for a gentle cleansing routine. Which recommendation is most appropriate?

  1. A strong soap bar applied directly to the scalp
  2. A hot-water rinse followed by no conditioner
  3. A high-pH clarifying shampoo used twice daily
  4. A mild, pH-balanced shampoo used less frequently with a moisturizing conditioner Correct answer.

Explanation

A mild, pH-balanced shampoo cleanses without stripping the scalp's acid mantle, and less frequent washing plus conditioning helps retain moisture. High-pH and soap-based products can worsen dryness and irritation.

Question 34Scientific Concepts and Hair Care

Which of the following best describes the term "hair density" as assessed during a consultation?

  1. The ability of the hair to stretch
  2. The number of hairs per square inch on the scalp Correct answer.
  3. The diameter of an individual strand
  4. The amount of curl in the hair

Explanation

Density is the count of hairs per square inch on the scalp and is described as thin, medium, or thick. It is distinct from texture, which is strand diameter, and from curl pattern and elasticity.

Question 35Scientific Concepts and Hair Care

A client's hair has a tight curl pattern and low porosity. Which cleansing and conditioning strategy is most suitable?

  1. Shampoo daily with a sulfate-heavy formula and skip conditioner
  2. Co-wash or use a sulfate-free cleanser, apply heat during conditioning, and detangle gently Correct answer.
  3. Apply a heavy wax to seal the cuticle and brush while dry
  4. Use a high-alcohol setting spray to smooth the cuticle

Explanation

Low-porosity, curly hair resists moisture uptake, so gentle cleansing and heat-assisted conditioning help products penetrate without disrupting the curl pattern. Dry brushing and harsh sulfates increase friction and breakage.

Question 36Scientific Concepts and Hair Care

Which statement correctly describes the role of disulfide bonds in the hair?

  1. They are peptide bonds that form between amino acids in the cortex
  2. They are salt bonds that reform when the hair dries
  3. They are strong chemical bonds that give hair its strength and shape and are broken during relaxers and perms Correct answer.
  4. They are weak hydrogen bonds that break with water alone

Explanation

Disulfide bonds are covalent links between cysteine amino acids that provide much of the hair's strength and hold its shape. Chemical relaxers and perms break and re-form these bonds to restructure the hair.

Question 37Scientific Concepts and Hair Care

A client with a history of scalp psoriasis asks about a service. Which action is most appropriate for the stylist?

  1. Recommend a medicated shampoo and refer the client to a physician before chemical services Correct answer.
  2. Scrub the plaques vigorously before shampooing
  3. Apply a strong relaxer to the affected areas
  4. Proceed with a chemical service and ignore the plaques

Explanation

Psoriasis is a medical condition that can be irritated by chemical services and mechanical trauma. The stylist should avoid treating inflamed areas and refer the client to a physician for management.

Question 38Scientific Concepts and Hair Care

Which of the following best explains why a hydroxide relaxer straightens curly hair?

  1. It raises the pH and breaks disulfide bonds, allowing the hair to be reshaped Correct answer.
  2. It deposits color that changes the curl pattern
  3. It coats the hair with a protective film that flattens the curl
  4. It adds moisture that relaxes the curl pattern temporarily

Explanation

Hydroxide relaxers work at a high pH to break disulfide bonds in the cortex, and the hair is then smoothed into a straight shape. The bonds re-form in the new position as the product is rinsed and the hair is neutralized or normalized.

Question 39Scientific Concepts and Hair Care

Which ingredient in a conditioner is primarily responsible for smoothing the cuticle and reducing static by bonding to negatively charged hair?

  1. Thickening gum
  2. Anionic surfactant
  3. Cationic surfactant Correct answer.
  4. Chelating agent

Explanation

Cationic surfactants carry a positive charge and bond to the negatively charged hair surface, smoothing the cuticle and reducing static. Anionic surfactants are cleansing agents, chelators bind minerals, and gums adjust viscosity.

Question 40Scientific Concepts and Hair Care

A stylist is mixing a lightener for a client with resistant gray hair. Which factor most affects the rate of the lightening process?

  1. The color of the mixing bowl
  2. The brand of the cape used
  3. The temperature of the styling tools after the service
  4. The strength of the developer and the alkalinity of the lightener Correct answer.

Explanation

Lightening speed depends on the developer strength and the alkalinity of the lightener, which together drive oxidation of melanin. Bowl color, capes, and post-service tools do not influence the chemical reaction.

Question 41Scientific Concepts and Hair Care

Which of the following is the correct description of the hair's acid mantle?

  1. A coating applied only during chemical services
  2. A protective film on the skin and hair with a slightly acidic pH that helps resist bacteria Correct answer.
  3. A layer of sebum that is strongly alkaline
  4. The inner medulla layer of the hair shaft

Explanation

The acid mantle is a slightly acidic film of sebum and sweat on the skin and hair that helps inhibit bacteria and maintain barrier function. Products with a similar pH support this protective environment.

Question 42Scientific Concepts and Hair Care

A client with medium-porosity hair wants a demi-permanent color service. Which statement best explains why this service is appropriate?

  1. Demi-permanent color requires a high-volume developer for full coverage
  2. Demi-permanent color lifts natural pigment significantly
  3. Demi-permanent color permanently lightens the hair
  4. Demi-permanent color deposits pigment without lifting and fades gradually over several shampoos Correct answer.

Explanation

Demi-permanent color deposits pigment and does not lift natural melanin, and it gradually fades over repeated shampoos. It uses low-volume developer and is suitable for medium-porosity hair seeking deposit-only color.

Question 43Scientific Concepts and Hair Care

Which term describes hair that has been chemically treated and has a raised cuticle that absorbs products quickly but loses moisture easily?

  1. High porosity Correct answer.
  2. Dense texture
  3. Normal elasticity
  4. Low porosity

Explanation

High-porosity hair has a raised or damaged cuticle that absorbs moisture quickly but cannot retain it well. Such hair requires gentler services and conditioning to prevent further damage.

Question 44Scientific Concepts and Hair Care

A client reports that her hair breaks easily when wet and does not return to its original length when stretched. Which property is most likely compromised?

  1. Elasticity Correct answer.
  2. Color retention
  3. Density
  4. Porosity

Explanation

Elasticity is the hair's ability to stretch and return to its original length without breaking. Hair that snaps when wet or fails to return indicates poor elasticity and should not receive strong chemical services.

Question 45Scientific Concepts and Hair Care

Which of the following statements about the medulla is accurate?

  1. It is the layer that determines curl pattern
  2. It is the innermost layer and may be absent in fine hair Correct answer.
  3. It contains most of the hair's melanin
  4. It is the outermost protective layer of the hair

Explanation

The medulla is the innermost core of the hair shaft and may be continuous, fragmented, or absent, especially in fine hair. It does not provide the primary protection or pigment of the hair.

Question 46Scientific Concepts and Hair Care

A stylist is evaluating a client who wants a double-process lightening service. Which finding would most strongly suggest postponing the service?

  1. Hair that has not been chemically treated for six months
  2. Hair that stretches and returns normally
  3. Medium density with a normal scalp
  4. Hair that snaps immediately when wet and has visible breakage Correct answer.

Explanation

Hair that snaps when wet shows poor elasticity and structural damage, which makes strong lightening unsafe. Postponing allows the hair to recover and avoids compounding damage.

Question 47Scientific Concepts and Hair Care

Which of the following best explains why hair with a compact, overlapping cuticle reflects more light than hair with a rough cuticle?

  1. A smooth cuticle scatters light in many directions
  2. A rough cuticle increases the hair's melanin content
  3. A rough cuticle absorbs all wavelengths of light
  4. A smooth cuticle creates an even surface that reflects light directly, producing shine Correct answer.

Explanation

Shine depends on how evenly the cuticle reflects light. A compact, smooth cuticle creates a uniform reflective surface, while a rough cuticle scatters light and appears dull.

Question 48Scientific Concepts and Hair Care

A client with a hydroxide relaxer service reports scalp burning during processing. Which action is the correct immediate response?

  1. Cover the area with a plastic cap and wait
  2. Rinse the product from the hair and scalp immediately and assess the skin Correct answer.
  3. Continue processing and apply more product to the area
  4. Apply a neutralizing shampoo without rinsing first

Explanation

Burning indicates irritation or a chemical burn risk, so the product must be removed immediately with thorough rinsing. Continuing the service can cause serious injury and should never be done.

Question 49Scientific Concepts and Hair Care

Which of the following best explains why a strong alkaline shampoo can leave hair feeling rough and dry?

  1. It permanently breaks disulfide bonds
  2. It raises the pH, causing the cuticle to swell and lift, which increases friction and moisture loss Correct answer.
  3. It lowers the pH and tightens the cuticle
  4. It adds cationic conditioning agents to the hair

Explanation

Alkaline products raise the pH and cause the cuticle scales to swell and lift, increasing friction and allowing moisture to escape. This is why pH-balanced or acidic products help keep the cuticle smooth.

Question 50Scientific Concepts and Hair Care

A client with a sensitive scalp and color-treated hair asks which shampoo to use at home. Which recommendation best preserves both scalp comfort and color?

  1. A daily high-pH clarifying shampoo
  2. A sulfate-free, pH-balanced color-protecting shampoo Correct answer.
  3. A medicated shampoo with a strong fragrance
  4. A soap-based bar shampoo with a high pH

Explanation

A sulfate-free, pH-balanced color-protecting shampoo cleanses gently, supports the acid mantle, and reduces color fade. High-pH and soap-based products can strip color and irritate sensitive skin.