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 plastic and environment pollution due to plastics environmental impact: plastics

Which of the following materials is responsible for the cause of animal death?

  1. Paper

  2. Plastic

  3. Chemicals

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Since plastics take several years to decompose, they are not environment friendly and cause pollution. When animals eat them, plastics remain stuck in their organs and cause severe damage, sometimes leading to death.
Multiple choice chemistry change around us physical changes changes and their classification physical changes

A filler is a substance added to make a material less expensive, or for:

  1. Changing its acidity

  2. Changing its physical properties

  3. Reducing its chemical activity

  4. Increasing its anti-rusting power
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A filter is a substance added to make a material less expensive or for changing its physical properties.

Filter are added to alter and improve the physical and mechanical properties of plastics it does not affect the structure arrangement of substance.

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

Which of the following is not a characteristic of thermosetting polymers?

  1. Linear or slightly branched long chain polymers.

  2. Heavily branched and cross-linked polymers.

  3. Become infusible on moulding.

  4. Cannot be remoulded or reused on heating.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Some characters of thermosetting polymers:

  • these polymers are cross-linked or heavily branched molecules,
  • on heating it undergoes extensive cross-linking in moulds and again become infusible,
  • these cannot be reused
    Some common examples are bakelite, melamine and urea formaldehyde resin

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

Which among the following is a cross-linked polymer?

  1. Polyesters

  2. Glycogens

  3. Melamine-formaldehyde

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

Melamine-formaldehyde polymer is cross-linked polymer or thermosetting polymer which on heating undergo extensive cross linking in moulds and again become infusible. These cannot be reused. Some common examples are bakelite, urea-formaldelyde resins, etc.

The correct option is [C].

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

Which of the following polymers does not involve cross-linkages?

  1. Vulcanised rubber

  2. Bakelite

  3. Melamine

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

Bakelite, melamine( thermosetting) and vulcanised rubber( elastomer) have cross-linkages in the structures whereas Teflon is linear addition or chain growth polymers that have not cross-linkages.

the correct option is [D].

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

Teflon is a special plastic on which oil and water do not stick.

  1. True

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

Teflon is a synthetic polymer (polytetrafluoroethylene) that can be used to cover the surface of certain object and imparts nonstick properties to it. Teflon is used for Non Stick material because the monomer units are hydrophobic in nature (tetrafluoroethylene) and thus oil and water do not stick to it.
option A is correct.

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

Which of the following substance is bio-degradable?

  1. cloth

  2. thermosetting plastic

  3. thermoplastic

  4. PVC pipes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Biodegradable wastes are such waste materials which are and can be degraded by natural factors like microbes (e.g. bacteria, fungi and few more), abiotic elements like temperature, UV, oxygen, etc. Example: kitchen wastes and other natural wastes. Cloth is a natural polymer made from cellulose, cotton, silk, wool etc and is biodegradable while plastics (thermoplastic, thermosetting plastics, PVC) are synthetic polymers and are non-biodegradable
option A is correct
Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Which of the following statement is true about PVC (polyvinyl chloride) and polythene?

  1. They are thermoplastics

  2. They are thermosetting plastics

  3. They are examples of natural substances

  4. They are natural fibres
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermoplastics on heating get deformed (its shape and size can be altered) and thus can also be bent. On the other hand, thermosetting plastics cannot be bent once moulded. Some examples of Thermoplastics are – Polythene and PVC. Some examples of Thermosetting plastics are – Bakelite and Melamine.


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

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out
Telephone instruments, plastic toys, ball point pens, plastic bowls are examples of:

  1. Thermoplastics

  2. Thermosetting plastic

  3. Polyester

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

 Telephone instruments, plastic toys, ball point pens, plastic bowls  are thermoplastics and so can be recycled.
Cooker handles, carry bags, plastic covering on electric wire, plastic chains etc are thermosetting plastics and so cannot be recycled.