____ is the synthetic fiber used to make parachutes.

Assertion: Nylon fibers cannot be used for making ropes for climbers.
Reason: Nylon fibers are very strong fibers.

Select the correct R principle for the statement. “To use something again that you would normally throw away.”

The correct option is b)Reuse.
Reuse is the act or practice of using an item, whether for its original purpose or to perform some other function. This should be distinguished from recycling, which dismantles used items to produce raw materials for manufacturing new products.

Ester is used in repeating units in the making of polyester. Choose true or false.

The statement is true.

• Polyester is a man-made or synthetic fiber made up of repeating units of chemicals called esters.
• Esters are sweet-smelling compounds composed primarily of carbon, hydrogen, and oxygen.
• The most commonly used polyester formula is: As an ester, it is made from the acid benzene-1,4-dicarboxylic acid (terephthalic acid) and the alcohol ethane-1,2-diol.
• It is better known by the mundane name of polyethylene terephthalate (PET).

Select the other name for artificial silk.

The correct option is b)Rayon.
Rayon is a semi-synthetic fiber made from natural sources of regenerated cellulose such as wood and related agricultural products. It has the same molecular structure as cellulose. Also called viscose. Viscose fibers and films come in many types and qualities.

Choose the fiber which is termed artificial wool.

The correct option is b)Acrylic.

• Polyester is a synthetic fiber obtained from coal or petroleum.
• Polyester is durable but breathable and not designed to absorb liquids.
• Acrylic fibers are made using acrylonitrile or vinyl cyanide polymers.
• Acrylic is often considered an imitation of wool because it retains heat.

Select the year in which nylon was made.

The correct option is a)1931.
Nylon, a synthetic plastic material composed of polyamides of high molecular weight, usually but not always manufactured as fibers. In the 1930s he founded the E.I. du Pont de Nemours & Company.
Nylons are a family of materials called polyamides, made by reacting carbon-based chemicals found in coal and petroleum in a heated, high-pressure environment. This chemical reaction, known as condensation polymerization, forms large polymers in the form of nylon films.

Uses of rayon include

The correct option is d)All of the above.
Uses of Rayon: Rayon is a semi-synthetic fiber made from regenerated cellulose. Along with natural cellulose fibers such as cotton, kapok, linen, hemp, jute and ramie, rayon is used in a wide range of home furnishings, fine functional fashion fabrics.
1. Used to produce fibers in the textile industry.
2. Rayon is used for the tire cord.
3. Also used to make carpets and surgical bandages.

Synthetic fibers do not absorb much

The correct option is c)Water.
Synthetic fibers absorb less water than natural fibers because there are no voids between each fiber. Because water does not penetrate the individual fibers of this fabric, it dries quickly. Hydrophilic fibers readily absorb water without causing discomfort to the wearer, whereas hydrophobic fibers are where the fibers do not absorb water.

Choose one of the following, which is not a part of 4R’s formula.

The correct option is d)Reinvent.

• Reduce consumption at source.
• Reuse items as often as possible to extend the life of the item.
• maximum recycling.
• RECOVER is composting garbage that can be decomposed at home.
• There are 4 Rs necessary to protect and sustain the environment.
• The 4 R's are Reduce, Reuse, Recycle and Recover. Reduce the amount of waste generated. If the material can be used, please modify and reuse the material.
• This reduces the amount of waste generated.
• Recycle waste and use recycled forms of waste. Reduce waste by maximizing waste recovery after recycling.

The type of polymers are

The correct option is c)3.

• There are three types of polymers: synthetic, semi-synthetic, and natural.
• Synthetic polymers are derived from petroleum .
• Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy.
• Natural polymers exist in nature and can be extracted.
• Semi-synthetic polymers are usually derived from the naturally occurring polymer cellulose. Semi-synthetic polymers are also called thermoplastic polymers.

In which season is wearing rayon clothes comfortable?

The correct option is d)Summer.

• Viscose is very similar to cotton and linen. It does not trap body heat and absorbs water easily, keeping you cool and comfortable in tropical conditions.
• Therefore, it is a particularly suitable fabric for summer.
• Rayon has very fine fibers, so it is more breathable than other fabrics and is light enough to not stick to the body even in hot weather.
• Due to its comfortable and cool feel, viscose is a particularly suitable fabric for sportswear and summer dresses.

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.