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 biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

Polymerization is important for

  1. Producing new chemicals

  2. Reducing osmotic influence

  3. Storage

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

Polymerisation is the process by which the simpler units known as monomers attach with the help of chemical bond to form a long chain or branched structure. It helps to produce new chemicals like glycogen, cellulose, fatty acids etc. The complex molecules (e.g. glycogen) are large in size and are unable to cross the semipermeable membrane by the process of osmosis. So they are osmotically inactive. These large size molecules which are used mainly for storage is broken down into simple molecules for metabolic need.  So, the correct answer is option D.

Multiple choice biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

Joining of repeating units to form a macromolecule is called

  1. Polymerisation

  2. Aggregation

  3. Polymorphism

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

Polymerization is the process by which the simpler unit known as monomers attaches with the help of chemical bond to form a long chain or branched structure. It helps to produce new chemicals. It is a process of joining repeating units to form a macromolecule is known as polymerization. For example, proteins are building blocks of the body. The proteins are made up of amino acids. The amino acids are linked together by peptide bonds to form a protein. 

Polysaccharides are formed by the repeating unit of monosaccharides. 
So, the correct answer is option A. 

Multiple choice economics environment pollution strategies to control environmental pollution strategies to control pollution strategies to control environmental pollution and green chemistry

The full form of LDPE is low-density polyester, which is monomer of first grade _______ unit.

  1. ester

  2. alcohol

  3. ether

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

Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. Its manufacture employs the same method today.

Multiple choice physics electric current through conductors carbon resistance and colour codes for carbon resistance carbon resistors and their colour coding resistors

Carbon resistors are of two types :

  1. composition type resistor and film type resistor

  2. rheostat and film type resistor

  3. rheostat and variable resistor

  4. composition type resistor and rheostat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Carbon resistors are of two types  composition type resistor and film type resistor.

There are a number of different types of fixed resistor:

Carbon composition: These types were once very common, but are now seldom used. 

Carbon film: This resistor type is formed by "cracking" a hydrocarbon onto a ceramic former.
Multiple choice chemistry substances in daily use polyester and acrylic rayon and nylon synthetic fibres
Nylon has high elasticity and tensile strength.

  1. True

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

Nylon is a synthetic thermoplastic linear polyamide-based polymer. 


It is used for a variety of applications to include clothing, reinforcement in rubber material like car tires, for use as a rope or thread, and for a number of injection molded parts for vehicles and mechanical equipment. 


It is exceptionally strong, relatively resistant to abrasions and moisture absorptivity, long-lasting, resistant to chemicals, elastic and easy to wash. 

It is the plastic of choice for components in the engine compartment of vehicles because of its high tensile strength, temperature resilience, and chemical compatibility.

Therefore, option A is correct.

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

Name the plastic whose sheets are used for packing liquids.

  1. Polythene

  2. Polycot

  3. Polywool

  4. Polyester
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In order to pack the liquids, Polyethylene terepthalate is used.

It is an important substance that can store the liquid without leakage.

It is a polymer of ethylene terepthalate and is quite durable in carrying the stuff from one place to another.

Strength and durability are the two important factors that make it an important choice.

Hence, the correct option is $\text{A}$
Multiple choice chemistry ionic equilibrium introduction to ionic equilibria in solution ionic equilibrium in solution ionisation of weak acids and weak bases

The polymer containing strong intermolecular forces, i.e. hydrogen bonding, is

  1. $\text{Teflon}$
  2. $\text{Nylon-6,6}$
  3. $\text{Polystyrene}$
  4. $\text{Natural rubber}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nylon 6,6 has strong intermolecular forces like hydrogen bonding.The substantial strength of polyamides such as nylon 6,6 and Kevlar results from hydrogen bond.

Multiple choice classification of polymers introduction to polymers and its classification polymer polymers chemistry

The weakest interparticle forces are present in:

  1. Thermosetting polymers

  2. Thermoplastic polymers

  3. Fibers

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

 Elastomers: The polymer chains are held together by the weakest intermolecular forces. These weak binding forces permit the polymer to be stretched.


Fibres: Fibers have strong intermolecular forces like hydrogen bonding. These strong forces also lead to close packing of chains and thus impact crystalline nature.

Thermoplastic polymers: They possess intermolecular forces of attraction intermediate between elastomers and fibers.

Thermosetting polymers: They are cross-linked & heavily launched.

Hence, option D is correct.

Multiple choice classification of polymers introduction to polymers and its classification polymer polymers chemistry

The products of addition polymerisation reaction is:

  1. PVC

  2. nylon

  3. terylene

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

Addition polymerization involves the repeated addition of monomers containing double or triple bonds without the loss of small molecules. PVC (polyvinyl chloride) is formed from vinyl chloride monomers via addition polymerization.

Multiple choice classification of polymers introduction to polymers and its classification polymer polymers chemistry

A polymer which is used as a suture, i.e., for stiching of wounds after operations is 

  1. PHBV

  2. nylon-2-Nylon-6

  3. dextran

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

Dextran is a complex branched glucan used as a plasma volume expander and in some surgical applications, but biodegradable polymers like PHBV or polyglycolic acid are more common for sutures. However, in the context of standard chemistry curricula, Dextran is often cited for its biocompatibility.