In which season is wearing rayon clothes comfortable?

Assertion: While working in the kitchen, we should not use synthetic fabrics.
Reason: Synthetic fabrics are easy to wash and dry up in less time.

Choose the following substance which is made up of thermosetting plastic.

Melamine is used in Crockery.

Synthetic fibers are

Choose one of the following small units which are used in the making of polymers.

Raw materials are obtained from which of the following for the making of synthetic fibers?

The correct option is d)All of the above.
Plant/Tree Based - Materials such as vegetables, fruits, flowers, wood, resins and latex are derived from plants and trees. Animal - Materials such as leather, meat, bones, milk, wool, and silk all come from animals. Mining - Materials such as minerals, metals, oil and coal are obtained by mining the earth

The plant fibers' basic component is

The correct option is b)cellulose.
One of the most abundant biomaterials on earth IS Cellulose. Usually synthesized by plants, but also produced by some bacteria. Like starch, cellulose is a homopolymer of glucose, but unlike starch, the glucose monomers are held together by β-1,4 linkages.

Select a synthetic fiber from the following.

The correct option is a)Rayon.
Synthetic fibers are man-made fibers, most of which are made from petroleum, called petrochemicals. Rayon is a regenerated cellulose fiber, commonly derived from wood pulp. Rayon is usually made from the eucalyptus tree, but any plant can be used (bamboo, soybean, cotton, etc.).

Select a natural polymer from the following.

The correct option is c)Silk.
Silk is a natural fiber produced by insects as material for nests and cocoons. There are several species of silk-producing insects, including silkworms (the most common type of silk), beetles, honeybees, bumblebees, hornets, and weaver ants.

_____ fiber is made of a natural polymer called cellulose.

The correct option is c)Cotton.
As cotton is made up of long chains of glucose molecules, it is naturally found in plants and is made up of pure cellulose, a naturally occurring polymer. Cellulose is actually a naturally occurring polymer. It is mainly obtained from plant wood and its derivatives such as grasses, aquatic plants. Cellulose helps plants stay firm and tough and is an important source of dietary fiber.

Select the correct characteristics of plastics.

The correct option is d)All of the above.
Plastics, like synthetic fibers, are polymers that, while flexible, can be molded into desired shapes and sizes and cured to create durable objects. The term "plastic" is derived from the Greek word "plastikos" meaning "to form" and is used to refer to a wide range of semi-synthetic polymers.
Properties of plastic:

• They are light and chemically stable.
• It can be easily molded into different shapes and sizes.
• Excellent heat insulation and low thermal conductivity.
• It has excellent impact resistance and does not rust.
• Excellent transparency and abrasion resistance.
• Poor dimensional stability and easy to deform.
• processing cost is low.

State true or false: Silk fiber is obtained from the cocoon of a silkworm.

The statement is true.
The cocoons are collected and stored in the sun or boiled or steamed. This helps separate the silk fibers. The process of separating the silk thread from the cocoon is called silk winding. The silk fibers are then spun into yarn. The resulting silk thread is woven into the desired garment.
Sericulture has two steps:

• Care of silkworms from the egg stage to the completion of the cocoon.
• Production of mulberry trees that provide leaves for earthworms to feed on.

Select a biodegradable material from the following.

The correct option is d)Paper.

• "Biodegradability" refers to the ability of a substance to break down (break down) biologically (with or without oxygen) by the action of microorganisms such as bacteria and fungi while being absorbed into the natural environment.
• No ecological damage occurs during the process.
• Paper is biodegradable because it is made from plants, and most plant materials are biodegradable.
• Paper is easily recycled and is considered more environmentally friendly than plastic as it can be recycled 6-7 times before its fibers are too short to be used in papermaking.

Select the correct option for the characteristics of the polymer.

The correct option is c)High elongation.
The combination of high tear strength and high elongation results in a material with high toughness. Elongation at break measures how much bending or deformation a material can withstand without breaking. The measured elongation at break values ​​indicate the ductility of the polymer.

Woollen clothes made up of wool are obtained from

The correct option is c)sheep.
Wool, an animal fiber that forms the protective covering or fleece of hairy mammals such as sheep, goats and camels. Prehistoric humans who wore sheepskin eventually learned to make threads and cloth from the fiber-covered material, which formed a protective outer layer due to selective breeding of sheep. Most of the long, coarse hair has been removed, leaving behind an insulating, fluffy undercoat made up of soft, fine fibers.
Wool is primarily obtained by shearing the fleece of live animals, but the fur of slaughtered sheep is sometimes treated to loosen the fibers, creating an inferior type called drawn wool.