{"id":"cosmetology-free","timeLimitSec":245,"questions":[{"id":"cof-001","section":"infect","q":"What is the main difference between disinfection and sterilization?","options":["Sterilization only removes visible dirt and debris","Disinfection is for skin and sterilization is for tools","Sterilization also destroys bacterial spores","Disinfection kills every microorganism, spores included"],"answer":2,"explain":"Disinfection destroys most harmful organisms on hard surfaces but not bacterial spores. Sterilization destroys all microbial life, including spores."},{"id":"cof-002","section":"sci","q":"Which layer of the hair gives it most of its strength, elasticity and natural color?","options":["The medulla","The dermal papilla","The cuticle","The cortex"],"answer":3,"explain":"The cortex is the middle layer; it holds the melanin and the keratin fibers that give strength and elasticity. Chemical services work in the cortex."},{"id":"cof-003","section":"chem","q":"Which hair color type can lift natural color and deposit new color in one step?","options":["Temporary color","Permanent (oxidation) color","Color-depositing conditioner","Semi-permanent color"],"answer":1,"explain":"Permanent color contains an alkalizing agent and is mixed with developer, so it lightens natural pigment and deposits dye in the cortex at the same time."},{"id":"cof-004","section":"hair","q":"Hair porosity describes:","options":["How well the hair absorbs moisture","The natural wave pattern of the hair","The diameter of each single strand","The number of hairs per square inch"],"answer":0,"explain":"Porosity depends on the cuticle. Highly porous hair absorbs liquids, including chemicals, quickly and may process faster."},{"id":"cof-005","section":"skin","q":"A small, raised bump on the skin that contains no fluid is a:","options":["Papule","Vesicle","Pustule","Macule"],"answer":0,"explain":"A papule is a small, solid, raised lesion. A pustule contains pus and a vesicle contains clear fluid."}]}