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Free National Cosmetology Theory Examination Practice Questions

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Sample Practice Questions

Try these 10 sample questions from the National Cosmetology Theory Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

  1. 1While parting a client's hair before a shampoo, a licensee sees live insects crawling on the scalp and eggs cemented to the hair shafts. To judge which salon surfaces and items are actually at risk, how does this infestation reach another person's head?

    1. A. The insects crawl from one person's hair directly onto another person's hair
    2. B. The insects hop from one person's hair onto another person's hair when it is combed
    3. C. The insects fly a short distance from one person's hair to another person's hair
    4. D. The insects are carried into the salon in the fur of dogs and cats and pass to hair

    Answer: A

    Explanation: Head lice are transferred by crawling contact between heads, not by jumping, flying, or animal carriage. CDC states that "Lice move by crawling; they cannot hop or fly." and that "Head lice spread most commonly by direct head-to-head (hair-to-hair) contact." CDC also states that "Dogs, cats, and other pets do not carry or spread human lice." Because transfer requires hair-to-hair or item-to-hair contact rather than air or animals, the licensee's controls are contact controls: keep the infested client's hair away from other clients' hair and do not reuse combs, brushes, capes, or towels used on that head.

    Reference: About Lice | Lice | CDC — About Lice, How it spreads

  2. 2A client booked for permanent hair colour arrives with a sunburned, tender scalp after a weekend outdoors. What does published guidance direct for the colour service?

    1. A. The service is not performed while the scalp is irritated, sunburned, or damaged
    2. B. The service is performed with a protective cream applied along the hairline
    3. C. The service is performed with the developer diluted to half its strength
    4. D. The service is performed after the scalp is cleansed with a clarifying shampoo

    Answer: A

    Explanation: Damaged scalp skin is a contraindication rather than a condition to be worked around. FDA's safety checklist for hair dye states: "Do not dye or relax your hair if your scalp is irritated, sunburned, or damaged." The other options are real salon practices used in other circumstances, but none of them restores the skin barrier: NIOSH notes that how much a chemical is absorbed depends on "Skin integrity (damaged or intact)", so applying product to broken or inflamed scalp increases absorption regardless of barrier cream, dilution, or cleansing.

    Reference: Hair Dyes | FDA — Hair Dyes, Coal-tar Hair Dye Safety Checklist

  3. 3During a skin analysis the licensee compares two clients of similar age, one fair with light eyes and one with more heavily pigmented skin. Which statement about visible sun-related ageing is correct?

    1. A. The fair, light-eyed client shows more of these changes, because pigment gives some protection
    2. B. Both clients show the same changes, because ageing of the skin is determined by age alone
    3. C. The more heavily pigmented client shows more of these changes, because pigment absorbs more light
    4. D. Neither client shows these changes before the age of sixty, regardless of exposure

    Answer: A

    Explanation: Pigment modifies the effect of the dominant cause of skin ageing. MedlinePlus states that among the influences on skin change "The greatest single factor, though, is sun exposure." and that "Natural pigments seem to provide some protection against sun-induced skin damage. Blue-eyed, fair-skinned people show more aging skin changes than people with darker, more heavily pigmented skin." The alternatives make the outcome depend on age alone, reverse the protective effect, or deny that exposure matters before a fixed age.

    Reference: Aging changes in skin: MedlinePlus Medical Encyclopedia — Aging changes in skin, Information

  4. 4A client with brittle nails asks the licensee what can be done at home between appointments. Which recommendation is given for preventing brittle nails?

    1. A. Keep the nails short and do not use nail polish
    2. B. Keep the nails long and seal them under polish
    3. C. Soak the nails in warm water several times a day
    4. D. File the nails with a coarse abrasive to thin the plate

    Answer: A

    Explanation: The recommendation targets the mechanical and chemical stresses that make nails brittle. MedlinePlus states: "To prevent brittle nails, keep the nails short and do not use nail polish." and adds "Use an emollient (skin softening) cream after washing or bathing." Repeated warm-water soaking is the treatment described for paronychia rather than a measure for brittle nails, and coarse filing thins and weakens the plate, so neither addresses this condition.

    Reference: Nail abnormalities: MedlinePlus Medical Encyclopedia — Nail abnormalities, Home Care

  5. 5A client arrives for a haircut with a round, scaly, itchy patch on the scalp where the hairs are broken off close to the skin. Identifying the class of organism responsible tells the licensee what kind of infection can be carried on shared implements. What class of organism causes this condition?

    1. A. Fungi
    2. B. Bacteria
    3. C. Mites
    4. D. Viruses

    Answer: A

    Explanation: Ringworm of the scalp is a dermatophyte infection despite its common name. CDC states plainly that "Ringworm is caused by fungi (not a worm)." and that "It is a common fungal infection of scalp, skin, or nails." Scalp ringworm specifically is named in the same source: "Tinea of the scalp, tinea capitis, is also common." Recognising a fungal cause matters at the chair, because fungal spores persist on combs, clippers, and capes, so a fungicidal claim on the disinfectant used for those items is the relevant control.

    Reference: Ringworm Basics | Ringworm | CDC — Ringworm Basics, What it is and Causes

  6. 6A client had the hair lightened eight days ago and now wants permanent colour applied. How long after bleaching, relaxing, or perming does published guidance direct that dye be delayed?

    1. A. At least 14 days
    2. B. At least 3 days
    3. C. At least 30 days
    4. D. At least 6 months

    Answer: A

    Explanation: A fixed waiting interval separates one chemical service from the next. FDA's safety checklist for hair dye states: "Wait at least 14 days after bleaching, relaxing, or perming your hair before using dye." The three-day figure in the same checklist attaches to a different instruction, "Do not scratch or brush your scalp three days before using hair dyes.", and the longer intervals offered are not given anywhere in the guidance. At eight days the client is inside the stated interval, so the service is rebooked.

    Reference: Hair Dyes | FDA — Hair Dyes, Coal-tar Hair Dye Safety Checklist

  7. 7A client with visible weathering of the skin on the face and forearms asks what has caused it. Which single factor is identified as the greatest contributor to these changes?

    1. A. Sun exposure
    2. B. Genetic makeup
    3. C. Nutrition
    4. D. Indoor heating

    Answer: A

    Explanation: MedlinePlus lists the influences and ranks them: "Skin changes are related to environmental factors, genetic makeup, nutrition, and other factors. The greatest single factor, though, is sun exposure." It adds a way of seeing this directly, by "comparing areas of your body that have regular sun exposure with areas that are protected from sunlight." The other options are real contributors named in the same source, and indoor heating appears there among other causes of skin changes, but none of them is identified as the greatest.

    Reference: Aging changes in skin: MedlinePlus Medical Encyclopedia — Aging changes in skin, Information

  8. 8During a manicure consultation the licensee sees a nail that is loose and lifting away from the nail bed, with debris collecting underneath. Which cause listed for that finding is a disease of the body rather than of the nail itself?

    1. A. Thyroid disease such as hyperthyroidism or hypothyroidism
    2. B. Long-term exposure to moisture or nail polish
    3. C. Chronic picking or rubbing of the skin behind the nail
    4. D. Crushing injury to the base of the nail

    Answer: A

    Explanation: Lifting of the plate from the bed has systemic as well as local causes, and the licensee needs to recognise when the finding points beyond the nail. MedlinePlus states that "Thyroid diseases such as hyperthyroidism or hypothyroidism may cause brittle nails or splitting of the nail bed from the nail plate (onycholysis)." The other options are real causes of nail change in the same source but are local: "Long-term exposure to moisture or nail polish can cause nails to peel and become brittle.", "Chronic picking or rubbing of the skin behind the nail can cause median nail dystrophy", and "Crushing the base of the nail or the nail bed may cause a permanent deformity." A systemic cause is referred rather than managed at the table.

    Reference: Nail abnormalities: MedlinePlus Medical Encyclopedia — Nail abnormalities, Causes

  9. 9A pedicure client has itching, redness, and scaling of the skin between the toes. The licensee needs to name the condition correctly when documenting why the service was declined. Which term names ringworm of the feet?

    1. A. Tinea pedis
    2. B. Tinea capitis
    3. C. Tinea cruris
    4. D. Onychomycosis

    Answer: A

    Explanation: The tinea infections are named for the body part involved. CDC states that "Ringworm on feet (tinea pedis) is often referred to as athlete's foot." and distinguishes the other sites in the same passage: "Ringworm on the groin (tinea cruris) is often called jock itch. Tinea of the scalp, tinea capitis, is also common." Nail involvement is named separately as onychomycosis: "Ringworm is also a common type of fungal nail infection (onychomycosis)." The condition described is on the skin of the feet, so tinea pedis is the correct term.

    Reference: Ringworm Basics | Ringworm | CDC — Ringworm Basics, Skin and scalp infections and Nail infections

  10. 10A client asks the licensee to tint the eyebrows and eyelashes to match a new hair colour, using the same professional hair dye. What is the correct response?

    1. A. The dye must not be used on the eyebrows or eyelashes, because it may cause blindness
    2. B. The dye may be used on the eyebrows but not on the eyelashes, because the lids are thinner
    3. C. The dye may be used on both if a patch test performed beforehand produces no reaction
    4. D. The dye may be used on both if it is diluted with conditioner before it is applied

    Answer: A

    Explanation: This is an absolute restriction written into the required caution statement itself, which reads in part: "This product must not be used for dyeing the eyelashes or eyebrows; to do so may cause blindness." FDA adds that coal-tar hair dyes are not eyebrow or eyelash dyes, that "Color additives intended for dyeing the eyebrows or eyelashes need FDA approval for that use." and that "No color additives are approved for dyeing the eyebrows or eyelashes." A negative patch test and dilution do not create permission, because the restriction is on the use, not on the dose.

    Reference: Hair Dyes | FDA — Hair Dyes, What the Law Says about Coal-tar Hair Dyes

Topics in this practice bank

These topics describe the available practice for National Cosmetology Theory Examination. Review the examination outline and its sources for scope and allocation details.

  • Scientific Concepts (35% of items)
    • Infection control and safety practices — Identify cause/transmission of diseases and infections
    • Infection control and safety practices — Identify the purpose and differentiate among the categories of infection control: Sanitation; Disinfection; Sterilization
    • Infection control and safety practices — Recognize how cross-contamination occurs and how it can be prevented (e.g., single use and multi-use items)
    • Infection control and safety practices — Apply blood exposure procedures
    • Infection control and safety practices — Identify requirements of government agencies: OSHA; EPA
    • Human anatomy and physiology — Identify function and structure of the: Hair and scalp; Skin; Nails
    • Human anatomy and physiology — Recognize signs and symptoms of conditions, disorders, and diseases related to: Hair and scalp; Skin; Nails
    • Human anatomy and physiology — Identify muscles and joints and their functions related to: Head and face; Arms and hands; Legs and feet
    • Human anatomy and physiology — Identify functions of: Nervous system; Circulatory system
    • Basic chemistry used in Cosmetology — Recognize purpose and effects of ingredients
    • Basic chemistry used in Cosmetology — Recognize interactions between chemicals
    • Basic chemistry used in Cosmetology — Recognize chemical reactions (e.g., overexposure, chemical burn)
    • Basic chemistry used in Cosmetology — Recognize the values of the pH scale
  • Hair Care and Services (45% of items)
    • Client consultation, analysis, and documentation — Evaluate condition of client’s hair and scalp
    • Client consultation, analysis, and documentation — Recognize conditions that would prohibit service (i.e., contraindications)
    • Client consultation, analysis, and documentation — Utilize preliminary tests (e.g., predisposition and strand tests)
    • Client consultation, analysis, and documentation — Recommend services or products based on client needs
    • Client consultation, analysis, and documentation — Establish/Maintain client records (e.g., service history, client card, medical history)
    • Hair care and services- Tools used in hair care services — Identify purpose, function, and infection control procedures of items: Equipment (e.g., chair, workstation); Implements (e.g., razors, shears, combs/brushes); Supplies and materials (e.g., towels, drapes, neck strips); Electrical tools (e.g., irons, blow dryers, clippers)
    • Hair care and services- Tools used in hair care services — Demonstrate safe practices: Tools/Implements; Ergonomics
    • Hair care principles and procedures — Demonstrate shampooing and conditioning
    • Hair care principles and procedures — Demonstrate scalp treatments and scalp massage
    • Hair care principles and procedures — Demonstrate draping (e.g., chemical, shampoo, cutting, styling)
    • Hair care principles and procedures — Recognize differences in hair care principles and procedures based on various hair types and textures
    • Hair design principles and procedures — Demonstrate hair cutting and shaping
    • Hair design principles and procedures — Demonstrate hair styling: Wet styling; Thermal styling; Natural hair styling (e.g., braiding)
    • Hair design principles and procedures — Apply, maintain, and remove hair enhancements: Wigs and hairpieces; Hair additions (e.g., taping, bonding, fusion, linking)
    • Hair design principles and procedures — Apply principles of balance and hair design (e.g., facial shape, physical structure)
    • Hair design principles and procedures — Recognize differences in hair design principles and procedures based on various hair types and textures
    • Chemical services principles and procedures — Perform hair color services (e.g., virgin, retouch, lightening, foiling, balayage, color formulation, color correction)
    • Chemical services principles and procedures — Perform chemical hair relaxer/restructurizer and curl reduction (e.g., hydroxide, thio, keratin) service
    • Chemical services principles and procedures — Perform chemical waving/texturizing (e.g., alkaline, acid, non-thio) services
    • Chemical services principles and procedures — Understand the chemical products used for the various hair texture types
  • Skin Care and Services (10% of items)
    • Client consultation, analysis, and documentation — Evaluate client’s skin: Type; Condition
    • Client consultation, analysis, and documentation — Recognize conditions that would prohibit service (i.e., contraindications)
    • Client consultation, analysis, and documentation — Recommend services or products based on client needs
    • Client consultation, analysis, and documentation — Establish/Maintain client records (e.g., service history, client card, medical history)
    • Tools used for skin care services — Identify purpose, function, and infection control procedures of items: Equipment (e.g., chair, steamer); Implements (e.g., tweezers, brushes, extractors); Supplies, products, and materials (e.g., creams, masks, towels, wax, head coverings)
    • Tools used for skin care services — Demonstrates safe practices: Tools/Implements; Ergonomics
    • Skin care principles and procedures — Apply knowledge of a basic facial
    • Skin care principles and procedures — Apply knowledge of hair removal
    • Skin care principles and procedures — Apply knowledge of makeup application
    • Skin care principles and procedures — Apply knowledge of electrical equipment
  • Nail Care and Services (10% of items)
    • Client consultation, analysis, and documentation — Evaluate condition of client’s nails
    • Client consultation, analysis, and documentation — Recognize conditions that would prohibit service (i.e., contraindications)
    • Client consultation, analysis, and documentation — Recommend services or products based on client needs
    • Client consultation, analysis, and documentation — Establish/Maintain client records (e.g., service history, client card, medical history)
    • Tools used for nail care services — Identify purpose, function, and infection control procedures of items: Equipment (e.g., workstation, pedicure basin); Implements (e.g., nippers, file); Supplies, products, and materials (e.g., towels, creams, polish)
    • Tools used for nail care services — Demonstrates safe practices: Tools/Implements; Ergonomics
    • Nail care service principles and procedures — Apply knowledge of a basic manicure and pedicure
    • Nail care service principles and procedures — Apply, maintain, and remove nail enhancements

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These are independent study questions, not actual examination items. For examination requirements and official information, view National Cosmetology Theory Examination details.