Natural and Synthetic Fibers: Properties and Uses

Questions and Answers About Materials

1. What Kinds of Natural Fiber Fabrics Are There?

• a) Plant and animal fibers, including those of seaweeds.
• b) Plant and animal fibers.
• c) Plant, animal, and mineral fibers.
• d) Animal and seaweed fibers.

2. What Fibers Are Manufactured Without the Use of Any Natural Product?

• a) All use natural products.
• b) Synthetic.
• c) Artificial.
• d) Both b and c.

3. What Characteristic Should a Fabric Have If It Will Be in Contact With Skin for Many Hours?

• a) Tensile strength.
• b) Hygroscopy.
• c) Resistance to chemicals.
• d) Soft to the touch.

4. The Origin of Plastic Can Be:

• a) Natural and artificial.
• b) Natural, artificial, and synthetic.
• c) Elementary, artificial, and natural.
• d) Natural and recycled.

5. The Degree of Polymerization Is:

• a) The density of the polymer.
• b) The resistance to atmospheric agents of the polymer.
• c) The number of monomers contained in the polymer.
• d) The mass of the polymer.

6. Natural Wood Can Be:

• a) Hard or soft.
• b) Agglomerated or slatted.
• c) Brown or white.
• d) Particles or fibers.

7. The Polymeric Substance That Reinforces the Cellulose Molecules That Form Wood Is Called:

• a) TableX.
• b) Elastomer.
• c) Lignin.
• d) Deoxyribonucleotide.

8. Wood Is:

• a) A material obtained from plants.
• b) A material with a complex and non-homogeneous structure.
• c) A material that is used to make bonfires.
• d) A material with a simple structure and bundled with a high moisture content.

9. What Are the Processes of Forming Polymers?

• a) Techniques used in plastic industries or by handlers to destroy plastic.
• b) Techniques used by industries or handlers to form new polymers from others.
• c) Techniques used in plastic industries or by handlers to shape them.
• d) Techniques used by industries or handlers to change the properties of a recycled polymer.

10. What Is Calendering?

• a) Circulating granulated plastic through heated rollers to achieve the desired thickness and texture.
• b) Heating the plastic until it melts and then shaping it.
• c) Screwing the plastic to shape it.
• d) Circulating the granulated plastic through tubes to mold it.

11. What Are the Most Important Processes for Shaping Polymers?

• a) Extrusion, extrusion blow molding, injection molding, foam molding, and calendering.
• b) Blow molding and extrusion molding, vacuum molding, foam molding, injection molding, and linear molding.
• c) Molding for polycondensation, vacuum molding, calendering, foam molding, and extrusion.
• d) Extrusion, extrusion blow molding, injection molding, foam molding, vacuum molding, compression molding, and calendering.

12. How Else Can Sandwich Structures Be Called?

• a) "Salad" type structure.
• b) Type 2 structure.
• c) "Sandwich" type structure.
• d) "Polymeric" structure.

13. What Properties Will We Seek When Using a Sandwich or Plywood Structure?

• a) That it is insulating and resistant.
• b) That it has good thermal conductivity.
• c) That it is rigid and resistant.
• d) That it is light, rigid, and resilient.

14. Thermoplastic Polymers:

• a) Are plastics from Thermopylae.
• b) Once polymerized, applying heat breaks the bonds.
• c) Must maintain a constant high temperature.
• d) Can be repeatedly molded by applying heat.

15. Based on Their Applications, Polymers Can Be Classified Into:

• a) Adhesives, paints, plastics, and rubber.
• b) Adhesives, fibers, paints, plastics, and elastomers.
• c) Fibers, plastics, elastomers, and indirect uses.
• d) Plastics and alcohol.