Textile and Fiber Materials

Cigarette filters are indeed manufactured from cellulose acetate, a synthetic plastic material derived from cellulose. This material traps some tar and particles while allowing smoke to pass through.

All four inventions - bulletproof vests (Stephanie Kwolek), fire escapes (Anna Connelly), windshield wipers (Mary Anderson), and laser printer toner cartridges (not the printer itself, but related components) - were indeed invented by women. Option B is correct.

The silk moth yields silk fiber during the pupa stage when it spins a cocoon of silk threads before metamorphosis. The cocoon is harvested and the silk filaments are unwound to produce commercial silk fiber.

Feathers are primarily composed of keratin, the same insoluble structural protein that makes up hair, nails, and horns in mammals. Keratin provides feathers with their strength, flexibility, and resistance to wear. The calamus is the hollow shaft at the feather's base, down refers to soft under feathers, and cartilage is a different structural tissue found in vertebrates.

In ancient Egypt, cotton was a luxury fabric reserved for priests and high-status individuals due to its cost and comfort. Silk was not widely available in Egypt (it came from China via trade routes much later), while nylon and polyester are modern synthetic fibers invented in the 20th century, thousands of years after ancient Egyptian civilization.

Zinc Oxide (ZnO) is known as 'Philosopher's Wool' because of the white, wool-like tufts it forms when zinc is burned in air. It was historically produced by alchemists.

Rayon is classified as a semi-synthetic fiber because it is produced by chemically treating cellulose from wood pulp. In contrast, Silk (from silkworms), Jute (from jute plants), and Coir (from coconut husks) are all natural fibers obtained directly from plant or animal sources without chemical processing.

Indian currency notes are printed on special paper made primarily from cotton pulp (100% cotton-based). This material makes currency durable, difficult to counterfeit, and gives it the distinctive crisp feel. Options like "Money Plant" and "Leaf Treatment" are misleading names, not actual materials used.

'Cut your coat according to your cloth' is a proverb meaning you should live within your means and adjust your ambitions to your resources. The metaphor comes from tailoring: you must cut a coat based on how much fabric you have available.

Classical guitars use nylon strings because they produce a warmer, mellower tone suitable for classical music repertoire. Steel strings would exert too much tension on a classical guitar's lighter bracing and construction. Plastic and animal guts are not used for classical guitar strings.

Cellulose acetate is a plastic polymer made from cellulose treated with acetic acid. It's used to make cigarette filters because it can be spun into very thin fibers that trap some tar and particles while allowing smoke to pass through, though filters don't make smoking significantly safer.

Rayon is not a natural fibre - it is a semi-synthetic fibre produced from cellulose through extensive chemical processing. Silk, jute, and coir are all natural fibres obtained directly from animals or plants without chemical modification. Rayon is often called 'artificial silk' because it mimics silk's properties but is man-made.

Denim originated in France, specifically from Nîmes, where it was called 'serge de Nîmes' (fabric from Nîmes). The name 'denim' comes from 'de Nîmes.' Velvet has ancient origins, polyester and nylon are synthetic fabrics invented in the 20th century.

Optical fibers are primarily used for communication purposes. They transmit data as light pulses through glass or plastic strands, enabling high-speed data transmission with minimal signal loss over long distances.