20 Hair Care Services Practice Questions & Answers
Every Hair Care Services practice question from the Cosmetology Practice Test, with the correct answer and a short explanation.
Start practice test →1. In haircutting, what does 'elevation' refer to?
- A.The angle or degree at which the hair is held from the head before cutting✓ Answer
- B.The height of the styling chair
- C.The amount of product applied to the hair
- D.The temperature of the styling tools used
Elevation is the angle at which the hair is lifted away from the head, measured in degrees; it determines whether the cut builds weight (low elevation) or removes weight and creates layers (higher elevation).
Source: Milady Standard Cosmetology, Haircutting chapter — ElevationReport a problem with this question
2. A cut performed at 0 degrees elevation (no lift) produces what result?
- A.A 90-degree uniform layer
- B.A blunt, one-length (weight-line) cut✓ Answer
- C.Maximum layering throughout
- D.Increased internal texture
Cutting at 0 degrees keeps all hair at one length, building maximum weight along a blunt weight line because no hair is lifted to be layered.
Source: Milady Standard Cosmetology, Haircutting — Elevation and weightReport a problem with this question
3. When hair is cut at 90 degrees elevation over the entire head using a stationary guide, the typical result is:
- A.A blunt one-length bob
- B.A steep graduated stack
- C.No change in weight distribution
- D.Uniform layers of the same length throughout✓ Answer
Elevating all hair to 90 degrees and cutting to a consistent length produces uniform layers because every strand is cut to the same distance from the head.
Source: Milady Standard Cosmetology, Haircutting — Uniform layered cutReport a problem with this question
4. What is a 'guideline' (guide) in haircutting?
- A.A comb used only for the nape area
- B.A chemical applied to mark sections
- C.A section of previously cut hair that determines the length of subsequent sections✓ Answer
- D.The natural part of the client's hair
A guideline is the first cut section that establishes the length; all following sections are cut to match or relate to it, ensuring an even, controlled result.
Source: Milady Standard Cosmetology, Haircutting — GuidelinesReport a problem with this question
5. A traveling (movable) guideline differs from a stationary guideline in that it:
- A.Requires no combing
- B.Moves with each new section, with a small portion of the previous section used as the guide✓ Answer
- C.Is only used for perms, not cuts
- D.Never moves and all hair is brought to one fixed point
A traveling guide moves as you progress, carrying part of the last cut section into the next; this creates layers or graduation, whereas a stationary guide brings all hair to one point for length or weight buildup.
Source: Milady Standard Cosmetology, Haircutting — Traveling vs stationary guidesReport a problem with this question
6. In permanent (thio) waving, the reducing agent (thioglycolate) acts on the hair by:
- A.Sealing the cuticle permanently shut
- B.Adding melanin to darken the hair
- C.Dissolving the medulla
- D.Breaking the disulfide (sulfur) bonds within the cortex✓ Answer
Thioglycolate is a reducing agent that breaks disulfide bonds by adding hydrogen; this softens the hair so it can conform to the rod shape before the bonds are reformed.
Source: Milady Standard Cosmetology, Chemical Texture Services — Reducing agents and disulfide bondsReport a problem with this question
7. In a permanent wave, what is the purpose of the neutralizer (oxidizer)?
- A.To strip color from the hair
- B.To reform the disulfide bonds in the hair's new curled shape✓ Answer
- C.To raise the hair's pH permanently
- D.To break more disulfide bonds
The neutralizer is an oxidizing agent (usually hydrogen peroxide) that removes the hydrogen added by the waving lotion, rebuilding the disulfide bonds so the hair holds its new curled configuration.
Source: Milady Standard Cosmetology, Chemical Texture Services — Neutralization/oxidationReport a problem with this question
8. How does a hydroxide relaxer straighten hair differently from a thio relaxer?
- A.Hydroxide relaxers permanently break disulfide bonds through lanthionization, which is not reversible✓ Answer
- B.Hydroxide and thio relaxers work by identical reactions
- C.Hydroxide relaxers only coat the hair surface
- D.Hydroxide relaxers add disulfide bonds
Hydroxide relaxers break a disulfide bond and convert it into a lanthionine bond (lanthionization), a permanent change that cannot be reversed; thio relaxers break disulfide bonds that are then reformed, so the two chemistries must never be used on the same hair.
Source: Milady Standard Cosmetology, Chemical Texture Services — Hydroxide relaxers and lanthionizationReport a problem with this question
9. Why must a hydroxide relaxer NOT be applied to hair that was previously treated with a thio relaxer or permanent wave?
- A.It will only affect the color
- B.There is no reason; they are fully compatible
- C.The incompatible chemistries can cause severe breakage or hair loss✓ Answer
- D.It will make the hair grow faster
Hydroxide and thio services rely on fundamentally different, incompatible chemical reactions; layering one over the other overprocesses the hair and can cause severe breakage or hair loss, so they must never be combined.
Source: Milady Standard Cosmetology, Chemical Texture Services — Relaxer compatibilityReport a problem with this question
10. On the pH scale, which statement is correct regarding hair chemistry?
- A.Alkaline solutions (high pH) swell and open the cuticle; acidic solutions (low pH) contract and close it✓ Answer
- B.Acidic solutions open the cuticle and alkaline solutions close it
- C.Hair has no natural pH
- D.pH has no effect on the cuticle
Alkaline products raise the pH, swelling the hair and lifting the cuticle so chemicals can penetrate; acidic products lower the pH, contracting the hair and closing the cuticle to seal and condition it.
Source: Milady Standard Cosmetology, Chemistry — pH scale and the cuticleReport a problem with this question
11. In the level-and-tone color system, what does 'level' indicate?
- A.The color's chemical family
- B.The lightness or darkness of a color✓ Answer
- C.The developer volume used
- D.The warmth or coolness of a color
Level measures the degree of lightness or darkness of a hair color on a numbered scale (typically 1 = black to 10 = lightest blond), independent of the tone.
Source: Milady Standard Cosmetology, Haircoloring — The level systemReport a problem with this question
12. In haircoloring, 'tone' (or hue) of a color refers to:
- A.The porosity of the hair
- B.How light or dark the color is
- C.The strength of the developer
- D.The warmth or coolness of the color (e.g., golden, ash, red)✓ Answer
Tone describes the warmth or coolness of a color — such as gold, red, or ash — while level describes lightness/darkness; the two together define a shade.
Source: Milady Standard Cosmetology, Haircoloring — ToneReport a problem with this question
13. Which of these are the three primary colors in color theory?
- A.Red, green, and blue
- B.Black, white, and gray
- C.Red, yellow, and blue✓ Answer
- D.Orange, green, and violet
In pigment/color theory used for haircolor, red, yellow, and blue are the primary colors because they cannot be created by mixing other colors; all other colors derive from them.
Source: Milady Standard Cosmetology, Haircoloring — Primary colorsReport a problem with this question
14. A secondary color is created by:
- A.Using a single primary color alone
- B.Adding white to a primary color
- C.Mixing a primary and a secondary color
- D.Mixing two primary colors in equal parts✓ Answer
Secondary colors — orange, green, and violet — are formed by mixing equal parts of two primary colors (red+yellow=orange, yellow+blue=green, blue+red=violet).
Source: Milady Standard Cosmetology, Haircoloring — Secondary colorsReport a problem with this question
15. How does developer (hydrogen peroxide) volume generally affect lift in permanent haircolor?
- A.Higher volume always deposits more color and lifts less
- B.Lower volume provides the most lift
- C.Volume has no effect on lift
- D.Higher volume provides more lift; lower volume provides less lift✓ Answer
Developer volume reflects peroxide concentration; higher volumes (e.g., 30 or 40) release more oxygen and provide greater lift of natural pigment, while lower volumes (e.g., 10 or 20) give minimal lift and are used mainly for deposit.
Source: Milady Standard Cosmetology, Haircoloring — Developers and volumeReport a problem with this question
16. Which type of haircolor deposits only on the surface, coats the cuticle, and washes out in one shampoo?
- A.Temporary color✓ Answer
- B.Semi-permanent color
- C.Demi-permanent color
- D.Permanent color
Temporary color has large pigment molecules that coat the cuticle surface without penetrating the cortex, so it is removed with a single shampoo.
Source: Milady Standard Cosmetology, Haircoloring — Temporary colorReport a problem with this question
17. How does demi-permanent color differ from permanent color?
- A.Demi-permanent deposits without significant lift and uses a low-volume developer, so it cannot lighten natural hair✓ Answer
- B.Demi-permanent washes out in one shampoo
- C.Demi-permanent contains no dye at all
- D.Demi-permanent lifts more than permanent color
Demi-permanent color uses a low-volume developer to deposit color and blend gray but has little or no lifting action, so it cannot lighten natural hair the way permanent color can; it also fades gradually over several weeks.
Source: Milady Standard Cosmetology, Haircoloring — Demi-permanent vs permanentReport a problem with this question
18. A predisposition (patch) test is performed before a haircolor service primarily to:
- A.Determine the hair's porosity
- B.Check the pH of the scalp
- C.Measure how long the color will process
- D.Identify whether the client is allergic or sensitive to the color product (e.g., aniline derivatives)✓ Answer
A patch (predisposition) test applies a small amount of the product behind the ear or on the inner elbow to check for an allergic reaction to aniline-derivative tints before applying color to the whole head.
Source: Milady Standard Cosmetology, Haircoloring — Patch/predisposition testReport a problem with this question
19. What is the purpose of a strand test in a haircolor service?
- A.To preview the resulting color and processing time on a small section of hair✓ Answer
- B.To check for a scalp allergy
- C.To sanitize the coloring tools
- D.To measure the client's hair length
A strand test applies the color formula to a single strand or small section to preview the final color result, check for even coverage, and determine the correct processing time before treating the whole head.
Source: Milady Standard Cosmetology, Haircoloring — Strand testReport a problem with this question
20. Why is a scalp and hair analysis (including porosity, texture, density, and elasticity) performed before a chemical service?
- A.To choose the color of the cape
- B.To determine the correct product, strength, and processing time and to check for conditions that contraindicate service✓ Answer
- C.To measure the client's height
- D.To decide the price of the service
Analyzing porosity, texture, density, and elasticity, plus checking the scalp for abrasions or disorders, lets the cosmetologist select the right product and strength, predict how the hair will process, and avoid performing a service on compromised hair or scalp.
Source: Milady Standard Cosmetology, Hair and scalp analysis — Porosity, texture, density, elasticityReport a problem with this question
Practice questions based on the NIC national cosmetology theory content outline and standard salon science. Not affiliated with NIC, PSI, or any state board. Your state may add state-law and practical content — check your board's requirements before testing. About NIC exams →