Chemistry

Polymers and Plastics

1,228 Questions

Polymers and plastics questions explore the properties, synthesis, and applications of various synthetic and natural polymers. Key topics include biodegradable plastics, vulcanization, and polymer nanocomposites. These concepts are frequently tested in science and engineering competitive exams.

Biodegradable plasticsPolymer nanocompositesVulcanization of rubberPolymer molecular weightAsphalt binders

Polymers and Plastics Questions

Multiple choice

Which of the following sets contains thermosetting polymers only?

  1. PVC, Bakelite, Polystyrene

  2. Vulcanized rubber, Bakelite, PVC

  3. Vulcanized rubber, Bakelite, Urea-formaldehyde resin

  4. Bakelite, Urea-formaldehyde resin, Polystyrene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vulcanized rubber, Bakelite, Urea-formaldehyde resin: All are thermosetting polymers.

Multiple choice

Directions: The following question has four choices out of which ONLY ONE is correct.

Which of the following polymers has/have found use in clothing materials?

  1. Polytetrafluoroethylene

  2. Polyvinyl chloride

  3. Polyacrylonitrile

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Copolymers containing polyacrylonitrile are often used as fibers to make knitted clothing like socks and sweaters, as well as outdoor products like tents and similar items.

Multiple choice

………….…………….. are naturally occurring polymers.

  1. <span lang="EN-GB" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times" new="">Starch, cellulose and pectin

  2. <span lang="EN-GB" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times" new="">Starch, cellulose and nylon

  3. <span lang="EN-GB" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times" new="">Cellulose, protein and polyester

  4. <span lang="EN-GB" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times" new="">Starch, proteins and teflon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Starch, cellulose and pectin: All the three are natural polymers.

Multiple choice

Which of the given non metals has an important activity in the vulcanization process of rubber?

  1. Sulphur

  2. Silicon

  3. Nitrogen

  4. Oxygen

  5. Zinc
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sulphur plays an important role in the rubber industry during the process of hardening of rubber called vulcanization. Vulcanization of rubber is a process of improvement its elasticity and strength by heating it in the presence of sulphur, which results in three dimensional cross linking of the chain rubber molecules bonded to each other by sulphur atoms.

Multiple choice

Which of the following polymers are prepared from the second most abundant substance in the Earth's crust?

  1. Silica

  2. Silicon

  3. Silicones

  4. Silicon dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Silicon is the second most abundant element in Earth's crust after oxygen and the eighth most abundant in the universe. Silicones are polymers that include silicon together with carbon, hydrogen, oxygen and sometimes other elements. Some common forms include silicone oil, silicone grease, silicone rubber, silicone resin and silicone caulk. Silicones have excellent resistance to oxygen, ozone and ultraviolet light. This property has led to widespread use of silicones in the construction industry and the automotive industry.

Multiple choice

Which of the following is incorrect about the biopolymer PLA (Poly Lactic Acid)

  1. It is made from agricultural products and is readily biodegradable

  2. It belongs to the family of aromatic polymers

  3. It shows good strength properties and film transparency

  4. PLA can be synthesized from lactic acid using direct polycondensation reaction.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because PLA belongs to family of aliphatic polymers commonly made from ل-hydroxy acids, which includes polyglycolic acid and polymandelic acid.

Multiple choice

Which of the following is not True regarding Microwave assisted step growth polymerization?

  1. Linear aromatic polyamides exhibit excellent thermal stability

  2. These materials are used in high performance applications

  3. The produced polymers exhibit excellent thermal stability

  4. These materials are soluble in organic solvents
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because the materials produced from microwave assisted step growth polymerization possess rigid structure which makes them hardly soluble in organic solvents.