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

Natural rubber and polychloroprene belongs to the ------------------------------.

  1. natural adhesives

  2. hot adhesives

  3. contact adhesives

  4. pressure sensitive adhesives
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Contact adhesives are used in strong bonds with high shear-resistance like laminates, such as bonding formica to a wooden counter, and in footwear, as in attaching outsoles to uppers. Natural rubber and polychloroprene (Neoprene) are commonly used contact adhesives.

Multiple choice

The first, commercially used, successful synthetic polymer was

  1. bakelite

  2. neoprene

  3. nylon

  4. polyvinyl chloride
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nylon is a thermoplastic silky material, first used commercially in a nylon-bristled toothbrush. It is made of repeating units linked by amide bonds and is frequently referred to as polyamide (PA). Nylon was the first commercially successful synthetic polymer.

Multiple choice

The polymer used in making missiles, solid propellant, rocket motors etc. is

  1. polystyrene

  2. polyethylene

  3. polypropylene

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

Polyacrylonitrile (PAN) is a resinous, fibrous, or rubbery organic polymer. Almost all polyacrylonitrile resins are copolymers made from mixtures of monomers with acrylonitrile as the main component. It is chemically modified to make the carbon fibers found in plenty of both high-tech and common daily applications such as civil and military aircraft primary and secondary structures, missiles, solid propellant, rocket motors, pressure vessels, fishing rods, tennis rackets, badminton rackets and high-tech bicycles.

Multiple choice

Which of the following is used in the production of synthetic resins and rubber adhesives?

  1. Cyclohexene

  2. 1,3,5,7-Cyclooctatetraene

  3. Cyclopentadiene

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

Cyclopentane is used in the manufacture of synthetic resins and rubber adhesives and also as a blowing agent in the manufacture of polyurethane insulating foam, as found in many domestic appliances such as refrigerators and freezers, replacing environmentally damaging alternatives such as CFC-11 and HCFC-141b.

Multiple choice

Vulcanized rubber

  1. natural rubber is heated with sulphur

  2. can be used in the range of 10-60℃

  3. natural rubber is heated with silicon

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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Multiple choice

Which of the following statements is incorrect about plastics?

  1. They are used in cars and aircrafts as they are lighter than metals.

  2. They do not react with water and air when exposed to moisture.

  3. They are used to make electrical equipments as they conduct electricity.

  4. They are used to store chemicals as they are non-reactive.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plastics are poor conductors of electricity and heat, so they are used to make handles of screw drivers and coverings of electrical equipments.

Multiple choice

Which of the following statements is correct?

  1. Natural rubber has trans configuration at each double bond.

  2. Gutta-percha has cis configuration of each double bond.

  3. Bakelite is a thermosetting polymer of phenol and formaldehyde.

  4. Vulcanisation is a process of making rubber soft and elastic.

  5. Bakelite is a thermosetting polymer.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Bakelite is a thermosetting polymer of phenol and formaldehyde.

Multiple choice

Match the following types of plastic with their applications.

1. PVC (i) Carry bags
2. Melamine (ii) Toys
3. Bakelite (iii) Electrical switches
4. Polythene (iv) Floor tiles

  1. 1 - (ii), 2 - (iv), 3 - (iii), 4 - (i)

  2. 1 - (iii), 2 - (ii), 3 - (iv), 4 - (i)

  3. 1 - (iv), 2 - (iii), 3 - (ii), 4 - (i)

  4. 1 - (iv), 2 - (ii), 3 - (iii), 4 - (i)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
1. PVC (i) Toys
2. Melamine (ii) Floor Tiles
3. Bakelite (iii) Electrical switches
4. Polythene (iv) Carry bags
Multiple choice methane study of methane carbon- an important element hydrocarbons chemistry

Bakelite is a:

  1. Urea formaldehyde resin

  2. Phenol formaldehyde resin

  3. Both A and B

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bakelite, a trademark of phenol-formaldehyde resin, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. 

A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin).

Multiple choice chemistry substances in daily use rayon and nylon synthetic fibres synthetic fibres or threads polyester and acrylic

Ropes made of nylon and polyester are commonly used in cranes and elevators because :

  1. Nylon is inflammable

  2. It is a good conductor of heat and electricity

  3. It is very strong, fairly elastic and light weight

  4. It is heat resistant
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ropes made of nylon and polyester are commonly used in cranes and elevators because It is very strong, fairly elastic and light weight.

Multiple choice chemistry substances in daily use rayon and nylon synthetic fibres synthetic fibres or threads polyester and acrylic

Which of the following statements is incorrect?

  1. Nylon clothings can with stand high temperature and are, therefore, good to wear in summers.

  2. Thermosetting plastics do not become soft on heating.

  3. Addition polymers are formed without the elimination of byproduct molecules.

  4. Natural rubber is obtained as latex from rubber trees.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nylon is a synthetic fiber that is not breathable and can melt or become uncomfortable in high heat, making it unsuitable for summer clothing. The other statements are scientifically accurate.