Chemistry

Polymers and Plastics

1,227 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 chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Three-dimensional molecules with cross-links are formed in the case of a:

  1. thermosetting plastic

  2. thermoplastic

  3. both (a) and (b)

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

Thermosetting plastic consists of chain of the  molecules which are cross-linked, with each other when heated. When thermosetting plastics cross-link, the molecules create a permanant, network  which is a $3-D$ structure and can be considered one giant molecule. Once cured, thermosetting plastic cn not be remelted, in the same way that cured concrete cannot be reset. 

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which of the following are not thermosetting polymers ?

  1. Bakelite

  2. polystyrene

  3. PVC

  4. Melmac
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Thermosetting polymers have different properties to thermosoftening polymers. Once moulded, they do not soften when heated and they cannot be reshaped. Vulcanised rubber is a thermoset used to make tyres. Its polymer chains are joined together by cross-links, so they cannot slide past each other easily.


Examples are given below:
  • Polyester fibreglass systems: sheet molding compounds and bulk molding compounds
  • Polyurithane insulating foams, mattresses, coatings, adhesives, car parts, print rollers, shoe soles, flooring, synthetic fibers, etc. Polyurethane polymers are formed by combining two bi- or higher functional monomers/oligomers.
  • Vulcanized rubber
  • Bakelite, a phenol formaldehyde resin used in electrical insulators and plasticware
  • Duroplast, light but strong material, similar to bakelite used for making car parts


Polyvinyl chloride(PVC) and polystyrene are thermoplastic polymer.
Hence, options B and C are correct.

Multiple choice evs our skeletal system and the skin bones and movements joints in the human body joints bones

Polymerization reactions that produce many macromolecules are called _______ reactions.

  1. Hydrolytic

  2. Condensation

  3. Carboxylation

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

The condensation reaction is the type of polymerization reaction in which many monomers join together through bonds forming macromolecules of polymers by giving out byproducts majorly water. The example includes polypeptide chains of proteins or the formation of cellulose.

Hence, the correct answer is 'Condensation'.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Match the following:


(i) Biodegradable polymer (p) 3-Hydroxybutanoic acid
(ii) Bakelite (q) Phenol
(iii) Neoprene (r) 2-chlorobuta-1, 3-diene
(iv) Glyptal (s) phthalic acid

  1. $i - p, ii - q, iii - r, iv - s$
  2. $i - q, ii - p, iii - r, iv - s$
  3. $i - p, ii - q, iii - s, iv - r$
  4. $i - s, ii - r, iii - p, iv - q$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i) PHBV (3-Hydroxybutanoic acid + 4-Hydroxypentanoic acid) is a biodegradable polymer. 


(ii) Bakelite is synthesized from the monomer Phenol & Formaldehyde

(iii)  2-chlorobuta-1,3-diene is the monomer of Neoprene.

 
(iv) Glyptal is synthesized from the condensation polymerization of Phthalic acid & Ethylene glycol.

Hence, the correct option is $\text{A}$

Multiple choice chemistry chemistry in daily life antimicrobials and antifertility drugs therapeutic action of different classes of drugs drugs and their classification

Which of the following represents a biliquid propellant?

  1. Nitroglycerin + Nitrocellulose
  2. $N _2O _4 +$ acrylic rubber
  3. $N _2O _4 +$ Unsymmetrical dimethylhydrazine

  4. Polybutadiene + Ammonium perchlorate

  5. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Nitroglycerin is combined with nitrocellulose to form gunpowders.

$N _2O _4$ is added to acrylic rubber to increase its tensile strength.

Unsymmetrical dimethylhydrazine with $N _2O _4$ is used as a hypergolic liquid rocket propellant.

Ammonium perchlorate in combination with polybutadiene is used as a solid composite propellant. 

Hence, option C is correct.
Multiple choice chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

Choose the most elastic substance from the following option.

  1. Rubber

  2. Nylon

  3. Steel

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

Elasticity is the property of solid materials to return to their original shape and size after the forces deforming them have been removed.


Steel is more elastic than any other thing because steel comes back to its original shape faster than rubber when the deforming forces are removed.

Hence, option C is correct.

Multiple choice chemistry materials: metals and non-metals physical properties of non-metals uses of metals and non metals physical properties of metals and non-metals

Most balloons, tyres and footballs are made-of rubber. This is because rubber is:

  1. naturally available

  2. cheap

  3. an electrical insulator

  4. soft and flexible
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prior to rubber tires, metal and wood were the materials in use. However it was found that natural Rubber provides better cushioning, makes less noise. Further rubber deforms under weight /force which results in larger contact patch with the road than with metal/wood tires of same diameter/width. During cornering at high speeds, the deformation of sidewall and larger contact area improves the traction or grip on the road increasing safety.

Multiple choice

Rubber__from vulcanized silicones with a high molecular weight is difficult to distinguish ....

  1. is produced

  2. that produces

  3. producing

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

The sentence already has a main verb ("is difficult"). Therefore, the blank needs a participle to modify the noun "Rubber" in a reduced relative clause. The past participle "produced" correctly expresses a passive meaning ("rubber which is produced"), whereas "producing" would imply an active meaning.

Multiple choice

What are type 1 plastics called?

  1. HDPE

  2. PVC

  3. PETE

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

Type 1 plastic is Polyethylene Terephthalate, commonly abbreviated as PET or PETE. It is the most common plastic used for beverage bottles.

Multiple choice

Plastic

  1. Natural

  2. Synthetic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plastic is a synthetic polymer created through chemical synthesis from petroleum or other raw materials.

Multiple choice

Rubber Tires

  1. Synthetic

  2. Natural
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

While natural rubber exists, most modern tires are made from synthetic rubber produced through chemical synthesis.

Multiple choice

Is plastic synthetic?

  1. Yes

  2. No
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plastic is a synthetic material produced through chemical processes, typically from petrochemicals.