Which level of infection control destroys all microbial life, including bacterial spores?
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About this test
This is a free 15-question sampler for the written part of a state board cosmetology exam, written by the StudyPDF team. It covers the theory every board tests: infection control and safety, the chemistry of hair products, the anatomy of hair, skin and nails, and the principles behind hair, skin and nail services. It mixes multiple choice, select all that apply and fill in the blank. Answer all 15 questions, then check your score and read the explanation for every one.
All 15 questions at a glance
Prefer to read before you play? Every question in the sampler is listed below. Answers and explanations stay collapsed until you open them.
1.Which level of infection control destroys all microbial life, including bacterial spores?
- A. Cleaning
- B. Disinfection
- C. Sterilization
- D. Antisepsis
Answer: C. Sterilization
Cleaning removes dirt, debris and some germs. Disinfection with an EPA-registered product destroys most pathogens on hard, nonporous surfaces, but it is not guaranteed to destroy bacterial spores. Sterilization destroys every form of microbial life, spores included, and it takes equipment such as an autoclave. Antisepsis means slowing or stopping germs on skin, so it is not a level for tools. Salon tools are normally cleaned and then disinfected, so check what your board requires for each type of tool.
2.Hair is held at 90 degrees from the curve of the head and cut to the same length all over. What does this produce?
- A. A solid, one-length form
- B. A graduated form with stacked weight
- C. Increased-length layers
- D. Uniform layers
Answer: D. Uniform layers
The angle the hair is held at (the elevation) decides the form. Hair held at 0 degrees gives a solid, one-length shape, and low elevation of about 45 degrees builds a graduated shape with weight at the perimeter. At 90 degrees every section is cut to the same length, which gives uniform layers. Above 90 degrees the layers lengthen toward the outside, which is an increased-length layer.
3.A razor nicks a client's skin during a service and it begins to bleed. After stopping the service, what should the professional do?
- A. Wipe the blood away with a towel and continue the service
- B. Put on gloves, stop the bleeding, clean the cut with an antiseptic and cover it
- C. Rinse the tool under water and finish the service
- D. Ask the client to press a tissue on the cut while the service continues
Answer: B. Put on gloves, stop the bleeding, clean the cut with an antiseptic and cover it
Bleeding is a blood exposure, so the service stops. Put on gloves, control the bleeding, clean the injury with an antiseptic and cover it with a bandage. Anything that touched the blood is then either thrown away if it is single-use, or cleaned and disinfected with a product that is effective against blood-borne pathogens before it is used again. Contaminated waste goes into a closed container. Your state board publishes its own blood exposure procedure, so learn that version.
4.Product A has a pH of 4.5 and product B has a pH of 6.5. How do they compare?
- A. A is 100 times as acidic as B
- B. A is 10 times as acidic as B
- C. A is 2 times as acidic as B
- D. A is 1,000 times as acidic as B
Answer: A. A is 100 times as acidic as B
The pH scale is logarithmic, so each whole number is a tenfold change in acidity. Two units apart is 10 x 10 = 100 times. A pH of 7 is neutral, anything below it is acidic and anything above it is alkaline. Hair and skin are slightly acidic, which is why acidic products tend to smooth the cuticle and strongly alkaline ones swell and lift it.
5.Which layer of the hair shaft holds most of the natural pigment and gives the hair its strength and elasticity?
- A. Cuticle
- B. Medulla
- C. Cortex
- D. Follicle
Answer: C. Cortex
The cortex is the thick middle layer. It holds the melanin that gives hair its color and the protein bonds that give it strength and stretch, which is why color, perms and relaxers all do their work there. The cuticle is the outer layer of overlapping scales that protects the inside. The medulla is the innermost core and is often missing in fine hair. The follicle is the pocket in the skin that the hair grows from, so it is not a layer of the shaft.
6.A client's hair was lightened and now looks brassy orange. Which tone on the color wheel will best cancel the orange?
- A. Blue-based
- B. Red-based
- C. Yellow-based
- D. Orange-based
Answer: A. Blue-based
Colors opposite each other on the color wheel cancel each other out. Blue sits opposite orange, so a blue-based or ash toner neutralizes brassy orange. Violet cancels yellow and green cancels red. Adding red, yellow or orange would only make the warmth stronger.
7.Before a first-time permanent hair color service, the stylist does a skin test (also called a predisposition test). What is it checking for?
- A. How porous the client's hair is
- B. Whether the client is allergic or sensitive to the product
- C. How many levels of lift the color will give
- D. Whether the scalp makes too much oil
Answer: B. Whether the client is allergic or sensitive to the product
A skin test checks for an allergic reaction or sensitivity. A small amount of the product is applied to a spot such as behind the ear or inside the elbow, usually 24 to 48 hours before the service. Itching, redness, swelling or a rash means the color is not used. A strand test is the different test: it shows how the hair will take the color and how long it needs. Follow the manufacturer's directions and your state's rules for how and when to test.
8.Which structure in the skin produces sebum?
- A. Sudoriferous gland
- B. Arrector pili
- C. Papilla
- D. Sebaceous gland
Answer: D. Sebaceous gland
Sebaceous glands are attached to hair follicles and release sebum, the skin's natural oil. Sudoriferous glands make sweat. The arrector pili is the tiny muscle that makes a hair stand up, and the papilla is the cluster of tissue at the base of the follicle that feeds the growing hair.
9.Which part of the nail unit makes new nail cells, so that damage to it can cause lasting growth problems?
- A. Nail bed
- B. Matrix
- C. Hyponychium
- D. Eponychium
Answer: B. Matrix
The matrix lies under the skin at the base of the nail, and it is where new nail cells are made. If it is injured, the nail can grow in distorted or not at all. The nail bed supports and feeds the plate, the hyponychium is the skin that seals the space under the free edge, and the eponychium is the living skin at the base of the nail plate, commonly called the cuticle.
10.Which of these are porous and cannot be properly disinfected, so they are thrown away or given to the client after one use?
Select all that apply.
- A. Wooden orangewood stick
- B. Stainless steel cuticle nippers
- C. Foam nail buffer block
- D. Plastic comb
- E. Cardboard emery board
Answer: A. Wooden orangewood stick, C. Foam nail buffer block, E. Cardboard emery board
Wood, foam and cardboard are porous, so germs and moisture soak in where a disinfectant cannot reach them. These items are single-use. Stainless steel and hard plastic are nonporous, so after cleaning they can be disinfected for the next client. Some boards let you hand the used item to the client instead of throwing it away, so check your own board's rule.
11.In which situations should a professional decline the service and suggest the client see a physician?
Select all that apply.
- A. Mild dandruff with no broken skin
- B. Open, weeping sores on the scalp
- C. Slightly dry skin on the elbows
- D. A thickened, yellow nail that crumbles at the edge and may be a fungal infection
- E. Live head lice found on the scalp
Answer: B. Open, weeping sores on the scalp, D. A thickened, yellow nail that crumbles at the edge and may be a fungal infection, E. Live head lice found on the scalp
Open sores, a suspected fungal nail infection and head lice are contagious or infected conditions. Working on them can spread the problem to the client and to the next client, and diagnosing is outside a cosmetologist's scope, so the safe step is to decline and refer. Mild dandruff and dry skin are common and not contagious, so the service can usually go ahead, often with a suggestion for a suitable product.
12.Which statements about the bonds in the hair are correct?
Select all that apply.
- A. Hydrogen bonds break with water or heat and re-form as the hair dries or cools
- B. Disulfide bonds are changed by perms and relaxers, so the new shape lasts
- C. Disulfide bonds break every time the hair gets wet
- D. Hydrogen bonds are the strongest bonds in the hair
Answer: A. Hydrogen bonds break with water or heat and re-form as the hair dries or cools, B. Disulfide bonds are changed by perms and relaxers, so the new shape lasts
Hydrogen bonds are weak and temporary. Water or heat breaks them and they set again in the new shape as the hair dries or cools, which is how wet setting and thermal styling work. Disulfide bonds are much stronger and only chemical services change them, which is why a perm or relaxer is long lasting. Getting hair wet does not break disulfide bonds.
13.Complete the sentence.
Healthy skin and hair are slightly acidic, with a pH of about _____. A product with a pH well above 7 is _____ and can swell and roughen the cuticle.
Options for blank 1: 2.0 to 3.0, 4.5 to 5.5, 7.0 to 8.0, 10.0 to 11.0
Options for blank 2: acidic, neutral, alkaline, oily
Answer: 4.5 to 5.5, alkaline
Skin and hair sit at roughly pH 4.5 to 5.5, the slightly acidic range. A pH above 7 is alkaline. Alkaline products swell the hair shaft and lift the cuticle, which is useful in some chemical services and rough on hair when it is overdone. Acidic products tend to close and smooth the cuticle.
14.Complete the sentence.
A salon disinfectant must be _____ registered, and it only works if the surface stays wet for the full _____ printed on the label.
Options for blank 1: FDA, OSHA, EPA, USDA
Options for blank 2: shelf life, contact time, drying time, expiration date
Answer: EPA, contact time
In the United States the EPA registers disinfectants, so the label carries an EPA registration number. OSHA sets workplace safety rules, such as safety data sheets and blood exposure rules, but it does not register disinfectants. The contact time is how long the product must stay wet on the surface to kill what the label claims, and wiping it off sooner than that cuts the effect.
15.Complete the sentence.
New skin cells form in the _____ of the epidermis and slowly move upward until they are shed from the _____.
Options for blank 1: basal layer, stratum corneum, dermis, subcutis
Options for blank 2: stratum corneum, basal layer, dermis, hypodermis
Answer: basal layer, stratum corneum
The epidermis renews itself from the bottom. Cells divide in the basal layer, the deepest layer of the epidermis, and gradually move toward the surface as they flatten and harden. The outermost layer is the stratum corneum, and the dead cells that reach it are shed. The dermis and the subcutis lie below the epidermis, so they are not part of it.
What the written cosmetology exam covers, and what it does not
Every state board issues its own cosmetology license. That means the written exam, the passing score, the number of training hours and whether a hands-on practical is part of the process all depend on where you apply. A common written exam is the NIC theory exam, built by the National-Interstate Council of State Boards of Cosmetology and delivered by a testing company such as PSI. Some boards use a different exam or a different vendor. Before you trust any number you saw online, open your state board's candidate information bulletin and read the content outline, the format and the passing score for your state.
The NIC theory bulletin describes 110 questions in 90 minutes, of which 100 are scored. Its outline groups the content into four areas: scientific concepts (infection control and safety, the anatomy and physiology of hair, skin and nails, and the basic chemistry of products), hair care and services, skin care and services, and nail care and services. One published version weights them 30, 40, 15 and 15 percent, and other versions differ slightly, which is one more reason to read the current bulletin for your board. Hair services are the biggest block, but the science block is where many people lose points, because it asks why a step is done and not only what the step is.
The practical exam is a different thing. Where a board requires one, it tests hands-on work on a mannequin or a model under a timer, and a text page cannot practice that. This test covers the written theory only. Pair it with the practical drills at your school, and ask your instructor what your board's practical looks like.
How to use this sampler
The 15 questions are spread across the whole outline: infection control and safety, product chemistry and pH, the structure of hair, skin and nails, and the reasoning behind hair, skin and nail services. Most of them test principles that hold in every state, such as why a tool is cleaned before it is disinfected or why a skin test comes before a color service. Where the law or a product label sets the rule, your state and the manufacturer's directions win over anything on this page.
Take it in one sitting without notes. If your exam uses the NIC format, 110 questions in 90 minutes works out to about 49 seconds per question, so aim for roughly a minute and a half on the select all that apply items and less on the rest. Then read the explanation for every question, including the ones you got right, because a lucky guess looks the same as real knowledge on a score screen.
Treat each miss as a topic. If you missed the pH question and the disinfectant question, the problem is not two facts, it is the chemistry block. Go back to your textbook for that block and come back to the sampler afterwards. The questions are original, written by the StudyPDF team to the published content areas, and none of them comes from a licensing exam or a textbook publisher's test bank.
How StudyPDF builds cosmetology practice tests from your own notes
Fifteen questions can show you which block is shaky. They cannot get you ready on their own, and the exam you take is built on your state's rules and the textbook your school uses, not on a generic bank.
StudyPDF works from your material instead. Upload your cosmetology textbook chapters, your instructor's slides or notes, or your state board's candidate bulletin, press New material, and StudyPDF builds practice tests from those exact pages. Every question is grounded in your material and every explanation cites where the answer comes from, so you can go straight back to the page when a step does not make sense.
You do not need to upload anything to start. Name a topic instead, for example chemical relaxers or infection control levels, and Bo sets it up with its key concepts so you can build quizzes and flashcards on it. Your results track which concepts you keep missing, so the next practice test can target them. Starting is free.
Written by the StudyPDF team. Last updated August 19, 2026.
Good to know
Is this cosmetology practice test free, and where do the questions come from?
Yes. All 15 questions, the score screen and every explanation are free to play in your browser. The StudyPDF team wrote every question and explanation from the published content areas of cosmetology theory. They are original items, not real exam questions, and StudyPDF is not affiliated with NIC, PSI, any textbook publisher or any state board of cosmetology.
How many questions is the real written exam, and what score passes?
The NIC theory exam bulletin describes 110 questions in 90 minutes, with 100 of them scored. Not every state uses that exam, and each state board sets its own passing score and its own training hours, so no single national number applies. Read your board's candidate information bulletin for the format and the score that count where you apply.
Does this cover the practical exam?
No. The practical exam, where your board requires one, tests hands-on work on a mannequin or a model under a timer, and a text page cannot practice that. This sampler covers the written theory only, so use your school's practical drills alongside it and ask your instructor what your board expects.
Can I get practice tests built from my own textbook and notes?
Yes. Upload your textbook chapters, your instructor's slides or your state board's candidate bulletin to StudyPDF, and you can build practice tests from those exact pages, with explanations tied to your sources. If you have nothing to upload, name a topic such as chemical relaxers or infection control instead.