Cosmetics Practice Questions
20 free Cosmetics practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which of the following chemical compounds is primarily used in sunscreens as a physical blocker to reflect UV radiation?
- A Titanium dioxide
- B Oxybenzone
- C Octyl methoxycinnamate
- D Avobenzone
Correct answer: Titanium dioxide
Titanium dioxide, along with zinc oxide, is a mineral-based physical sunscreen: it sits on top of the skin and scatters or reflects both UVA and UVB rays. The other options are chemical filters, which absorb UV radiation and convert it to heat rather than reflecting it.
What is the primary role of 'Humectants' like Glycerin in moisturizing creams?
- A To form a waterproof surface seal that traps existing moisture
- B To attract and bond water molecules from the air to the skin
- C To act as a preservative against bacterial growth
- D To bleach skin pigments and lighten dark spots
Correct answer: To attract and bond water molecules from the air to the skin
Humectants are hygroscopic substances that draw moisture into the stratum corneum. Glycerin, hyaluronic acid, and urea are common examples used to keep the skin hydrated.
Which metal salt is the active ingredient in most antiperspirants used to temporarily block sweat glands?
- A Aluminium chlorohydrate
- B Magnesium sulfate heptahydrate
- C Copper(II) sulfate
- D Sodium bicarbonate
Correct answer: Aluminium chlorohydrate
Aluminium-based salts react with the sweat to form a temporary plug within the sweat duct. This physically prevents sweat from reaching the skin surface, whereas deodorants merely mask or neutralize odor.
The 'SPF' rating on a sunscreen bottle specifically measures protection against which type of radiation?
- A Infrared radiation
- B Ultraviolet A (UVA)
- C Ultraviolet B (UVB)
- D Visible light
Correct answer: Ultraviolet B (UVB)
Sun Protection Factor (SPF) is a measure of how well a sunscreen protects the skin from UVB rays, which cause sunburn and play a key role in skin cancer. UVA protection is usually denoted by a 'PA' rating or the term 'Broad Spectrum'.
Which of the following is a common 'Emulsifier' used to prevent the separation of oil and water phases in lotions?
- A Salicylic acid
- B Ceteareth-20
- C Glycerin
- D Titanium dioxide
Correct answer: Ceteareth-20
Emulsifiers are surfactants that reduce the surface tension between oil and water. Ceteareth-20 helps stabilize the mixture, ensuring the product remains a uniform cream rather than separating into two layers.
What is the primary chemical function of 'Parabens' in cosmetic formulations?
- A To provide a pleasant fragrance
- B To act as a preservative by inhibiting microbial growth
- C To increase the viscosity and thickness of the liquid formulation
- D To enhance the color of the product
Correct answer: To act as a preservative by inhibiting microbial growth
Parabens are esters of para-hydroxybenzoic acid. They are highly effective at preventing the growth of harmful bacteria and mold in water-based cosmetics, thereby extending shelf life.
Which substance is commonly used in nail polish removers due to its ability to dissolve the polymer film of the polish?
- A Ethanol
- B Acetone
- C Glycerol
- D Acetic acid
Correct answer: Acetone
Acetone (propanone) is a powerful solvent that breaks down the resins and plasticizers in nail lacquer. It evaporates quickly, though it can also strip natural oils from the skin and nails.
In hair dyes, which chemical is typically used as an oxidizing agent to develop the color and lighten the natural melanin?
- A Ammonia
- B Hydrogen peroxide
- C Sodium hypochlorite
- D Citric acid
Correct answer: Hydrogen peroxide
Hydrogen peroxide acts as the developer in permanent hair dyes. It opens up the hair cuticle and reacts with the dye precursors to form larger color molecules inside the hair shaft.
What is the function of 'Surfactants' in shampoos?
- A To chemically repair and reseal split ends
- B To lower surface tension and trap oil and dirt in micelles
- C To permanently shift the pH of the scalp to a strongly acidic level
- D To coat each hair strand with a thin layer of wax
Correct answer: To lower surface tension and trap oil and dirt in micelles
Surfactants like Sodium Lauryl Sulfate have a hydrophilic head and a lipophilic tail. They attach to oils and dirt, allowing them to be rinsed away with water.
Which of the following is an Alpha Hydroxy Acid (AHA) used in chemical exfoliants to dissolve the 'glue' between dead skin cells?
- A Salicylic acid
- B Ascorbic acid
- C Retinoic acid
- D Glycolic acid
Correct answer: Glycolic acid
Glycolic acid, derived from sugar cane, has a small molecular size that allows it to penetrate skin effectively. AHAs work on the skin surface to promote cell turnover and improve texture.
Thioglycolic acid is a key chemical used in which of the following cosmetic procedures?
- A Professional teeth whitening
- B Sunless tanning and skin bronzing treatments
- C Lipstick pigmentation
- D Hair perming and chemical straightening
Correct answer: Hair perming and chemical straightening
Thioglycolates break the disulfide bonds (S-S) in the hair's keratin structure. Once the bonds are broken, the hair can be reshaped and then 'neutralized' to lock it into a new curly or straight form.
Which ingredient is responsible for the 'shimmer' or 'pearlescent' effect in eyeshadows and highlighters?
- A Mica
- B Coal tar
- C Talc
- D Paraffin wax
Correct answer: Mica
Mica is a natural silicate mineral that is ground into fine powders. When coated with iron oxides or titanium dioxide, it creates a reflective, sparkling effect through light interference.
What is the primary role of 'Occlusives' like Petrolatum (Vaseline) in skincare?
- A To supply vitamins directly to the living skin layers
- B To chemically exfoliate and dissolve the outermost dead skin cell layers
- C To neutralize and strip away the skin's natural oils
- D To form a physical barrier that reduces water loss from the skin
Correct answer: To form a physical barrier that reduces water loss from the skin
Occlusives create a hydrophobic film on the skin's surface. This barrier prevents moisture from evaporating, making them essential for treating extremely dry skin or compromised skin barriers.
Which of the following is a common antioxidant used in 'Anti-aging' creams to neutralize free radicals from UV exposure?
- A Tocopherol
- B Sodium lauryl ether sulfate
- C Formaldehyde
- D Talc
Correct answer: Tocopherol
Tocopherol is a fat-soluble antioxidant that protects cell membranes from oxidative damage. It is often paired with Vitamin C to stabilize the formula and enhance skin protection.
What is the main chemical constituent of 'Talcum powder', often used to absorb moisture and reduce friction?
- A Calcium carbonate
- B Sodium bicarbonate
- C Hydrated sodium aluminium silicate
- D Hydrated magnesium silicate
Correct answer: Hydrated magnesium silicate
Talc is a naturally occurring mineral composed of magnesium, silicon, and oxygen. It is the softest known mineral and is valued for its ability to absorb moisture and provide a smooth feel.
The active ingredient in most self-tanning lotions that reacts with skin proteins to produce a brown color is:
- A Dihydroxyacetone
- B Melanin
- C Beta-carotene
- D Dihydroxyphenylalanine
Correct answer: Dihydroxyacetone
Dihydroxyacetone (DHA) is a three-carbon sugar that reacts with amino acids in the dead surface layer of the skin. This non-enzymatic browning is known as the Maillard reaction, similar to what happens when food is cooked.
Why is 'Micellar Water' effective at removing makeup without the need for vigorous scrubbing?
- A It contains a high concentration of alcohol that strips oils
- B It is a mildly acidic solution that loosens makeup pigments
- C It carries fine abrasive particles that gently scrub away makeup residue
- D It contains tiny clusters of surfactant molecules called micelles
Correct answer: It contains tiny clusters of surfactant molecules called micelles
Micelles have a lipophilic center that attracts and 'lifts' oil, wax, and makeup away from the skin. The hydrophilic exterior allows the dirt to be wiped away easily with a cotton pad.
Which gas is commonly used as a 'Propellant' in aerosol cosmetic sprays like hairspray or deodorant?
- A Sulfur hexafluoride
- B Carbon monoxide
- C Argon
- D Butane or propane
Correct answer: Butane or propane
Liquefied petroleum gases (LPG) like butane and isobutane are used as propellants. They exist as liquids under pressure in the can and turn into gas as they are released, forcing the product out in a fine mist.
What is the purpose of 'Chelating Agents' like Disodium EDTA in liquid soaps and shampoos?
- A To provide a long-lasting floral scent
- B To thicken the consistency of the gel
- C To bind with metal ions in hard water and prevent soap scum
- D To act as a strong bleaching agent that permanently lightens hair
Correct answer: To bind with metal ions in hard water and prevent soap scum
EDTA 'sequesters' minerals like calcium and magnesium found in hard water. This prevents them from reacting with surfactants, ensuring the product lathers well and doesn't leave a film on the skin.
Which of the following is a 'Retinoid', a derivative of Vitamin A used to treat acne and stimulate collagen production?
- A Retinol
- B Niacinamide
- C Biotin
- D Panthenol
Correct answer: Retinol
Retinol is a precursor to retinoic acid. It communicates with skin cells to increase cell turnover and boost the production of collagen and elastin, making it a gold standard in dermatology.