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

Nylon is a ___.

  1. polymer of ethylene

  2. polyalcohol

  3. polyamide

  4. poly - aldehyde
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nylon is a polyamide, meaning it contains repeating amide (-CONH-) linkages in its polymer chain. It's formed by condensation polymerization between diamines and dicarboxylic acids. Option A is wrong because nylon is not derived from ethylene, option B describes polyalcohols (like PVA), and option D is incorrect terminology.

Multiple choice

Polythene is polymer of ____.

  1. ethene

  2. methane

  3. ethane

  4. acetylene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polythene (polyethylene) is formed by addition polymerization of ethene molecules. The process breaks the carbon-carbon double bond in ethene and forms long chains of single-bonded carbon atoms with hydrogen atoms. Options B (methane), C (ethane), and D (acetylene/ethyne) do not polymerize to form polythene.

Multiple choice

Koroseal is also known as

  1. vinyl chloride

  2. acrylonitrile

  3. vinylidine chloride

  4. tetrafluoroethylene

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because polyvinylchloride polymer compounds is called the koroseal.

Multiple choice

To reduce consumption of synthetic resins, the ingredient added is a(an)

  1. accelerator

  2. elastomer

  3. modifier

  4. filler
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To reduce the consumption of synthetic resins, the ingredient added is a filler. Because of their low cost, fillers are important in reducsing the overall cost of polymers. Fillers may also improve the strength, hardness, toughness, abrasive resistance, dimensional stability, etc.

Multiple choice

A polymeric substance used to make parachute is

  1. Rayon

  2. Viscose

  3. Cotton

  4. Terylene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Viscose (a type of rayon) was historically used for parachutes due to its strength, elasticity, and resistance to moisture. While modern parachutes use nylon, viscose-rayon fabrics were standard in early parachuting. Terylene is polyester, cotton is natural fiber, and rayon is the broader category.

Multiple choice

The ratio of Mw and Mn for most of the synthetic polymer is

  1. more than 1

  2. less than 1

  3. equal to 1

  4. dependent upon the type of monomer

  5. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For synthetic polymers, Mw (the weight average) is always larger than Mn (the number average), so it is always greater than 1.

Multiple choice

Buna-S rubber is made up of

  1. isoprene and butadiene

  2. styrene and butadiene

  3. vinyl chloride and sulphur

  4. butadiene

  5. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Buna-S rubber is made up of styrene and butadiene.

Multiple choice

Which of the following statements is/are false?

  1. Natural rubber is a 1, 4-polymer of isoprene.

  2. Buna-S is a copolymer of butadiene and styrene.

  3. Natural rubber has the trans-configuration at every double bond.

  4. In vulcanisation, the formation of sulphur bridges between different chains make rubber harder and stronger.

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

Natural rubber has the cis-configuration at every double bond.

Multiple choice

Nylon is not a ____________.

  1. homopolymer

  2. polyamide

  3. copolymer

  4. condensation polymer

  5. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A homopolymer is a polymer, which is formed from only one type of monomer and is made up of 2 different monomers; a diamine and a dicarboxylic acid.