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 manmade materials synthetic rubber rubber polymer

Which of the following has cross-linked polymer?

  1. Vulcanised rubber

  2. Nylon

  3. Phenol-formaldehyde resins
  4. Both $A$ and $C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vulcanised rubber contains sulphur bridges between polymer chains, and phenol-formaldehyde resins (like Bakelite) are thermosetting polymers with a highly cross-linked structure. Both are examples of cross-linked polymers.

Multiple choice chemistry manmade materials synthetic rubber rubber polymer

Which material is used for vulcanisation of rubber?

  1. Iron

  2. Sulphur

  3. Chlorine

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

The material used for the vulcanisation of rubber is sulphur.


The reasons why the rubber is vulcanised are as follows:

i) It is soft and sticky and becomes more so at high temperature and brittle at low temperature. That is why, it is used at low-temperature range ($280-330$) K, where its elasticity is maintained.
ii) It is attacked by oxygen and other oxidising agents.
iii) It has a high water absorption capacity, low tensile strength and low resistance to abrasion.
iv) It is reactive to organic solvents.
Therefore, natural rubber is vulcanised by heating it with about ($3-5\%$) sulphur at ($373-415$) K.

Multiple choice chemistry manmade materials synthetic rubber rubber polymer

Which of the following type of forces are present in vulcanized rubber?

  1. Weakest intermolecular forces

  2. Hydrogen bonding

  3. Three dimensional network of bonds

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

Vulcanised rubber is highly elastic, so weakest intermolecular forces present in it.

Multiple choice chemistry manmade materials synthetic rubber rubber polymer

Which of the following is resistant to petrol, lubricating oils and organic solvents?

  1. Nitrile rubber

  2. Buna - N

  3. GRN

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrile rubber, Buna-N, and GRN are all names for the same copolymer of butadiene and acrylonitrile. This material is known for its excellent resistance to oil, fuel, and other chemicals.

Multiple choice chemistry manmade materials synthetic rubber rubber polymer

Which of the following is not a synthetic rubber?

  1. Neoprene

  2. Buna-N rubber

  3. Buna-S rubber

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

Neoprene, Buna-N, and Buna-S are all types of synthetic rubbers. Polyethylene is a plastic (thermoplastic polymer), not a synthetic rubber.

Multiple choice chemistry man made materials plastic waste thermocol ways to reduce non degradable garbage

The plastics which soften upon being heated but regains all its original properties on cooling are known as:

  1. thermoplastics

  2. thermosetting plastics

  3. thermoelastic

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

The plastics which soften upon being heated but remain an original properties on cooking are known thermoplastics.

Example: Polythelene, PVC, Acrylic, Nylon and Teflon

Multiple choice chemistry man made materials plastic waste thermocol ways to reduce non degradable garbage

______ are the substances are capable of molding and casting into various shapes and sizes.

  1. Thermosettig plastic

  2. Thermoplastic

  3. Polyamide

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

Thermoplastics are materials which become soft on heating and gets hardened when cooled. This process of heating and cooling can be performed several times on thermoplastic without significant change in its characteristics. Due to these properties, thermoplastics can be molded and cast into various shapes and sizes

Multiple choice chemistry man made materials plastic waste thermocol ways to reduce non degradable garbage

Which of the following is used in automobile battery casings?

  1. HDPE

  2. PP

  3. PVC

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

 The purpose of a battery casing is for enclosing and hermetically sealing a battery body which converts chemical energy into electrical energy in order to generate current to power an electronic device. 

Battery casing is manufactured in layers. The casing layers are developed from various raw materials and can include one or two, for example, polyethylene terephthalate layers, a polymer layer, and a polypropylene layer. 


Among the given option the correct answer is B.

Multiple choice chemistry man made materials plastic waste thermocol ways to reduce non degradable garbage

Which out of the following is used for making disposable cups?

  1. LDPE

  2. PS

  3. PP

  4. PVC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A paper cup is a disposable cup made out of paper and often lined or coated with plastic or wax to prevent liquid from leaking out or soaking through the paper. Disposable cups are made up of Polystyrene (PS).

The main advantages of polystyrene cups are-

They use fewer raw materials and their manufacturing process consumes less energy and produces less waste than that of paper cups.
 Polystyrene cups are also lighter than paper ones, which leads to lower transport costs.
Option B is correct.
Multiple choice zoology garbage in, garbage out plastic waste thermocol ways to reduce non degradable garbage recycling of paper

Polyblend is ___________________.

  1. A mixture of two different types of plastics

  2. A fine powder of recycled modified plastic

  3. A blend of plastic and bitumen

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

Ahmed khan, a plastic sack manufacturer of Bangalore in 1998, developed polyblend, a fine powder of recycled modified plastic in collaboration with R. V. Collage of Engineering and Bangalore city Corporation. He proved that the mixture of polyblend and bitumen was better for road carpeting as it had better water repellent property. It increased road life by a factor of three.