Tag: plastic waste

Questions Related to plastic waste

Which of the following is used to make disposable cups?

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  1. Low density polyethylene

  2. Polypropylene

  3. Polystyrene

  4. PVC

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Correct Option: C
Explanation:

Disposable cups are made up of thermocol. It is a synthetic petroleum product which is made by restructuring of the chemical bonding of the polystyrene, to develop a stretch polystyrene. In this process, thermoplastic granules are expanded through the application of steam and air. The expanded granules become large and light in weight.

Thermosetting plastics can be remoulded on gentle heating.

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  1. True

  2. False

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Correct Option: B
Explanation:

Thermosetting plastics: Which on heating becomes infusible these cannot be reused.Ex- Bakelite,urea formaldehyde resin.

Thermoplastic plastics: These become soft on heating and hard on cooling.
Ex.polythere,polystyrene.
Thermoplastic plastics can be remoulded.

Synthetic fibers are obtained from which of the following?

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  1. Plants

  2. Sheeps

  3. Chemicals

  4. Jute

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Correct Option: C
Explanation:

Synthetic fibres are created by extruding fibre forming materials through spinnerets into air and water, forming a thread. These artificially manufactured fibres were made from polymers obtained from petro chemicals. These fibres are called synthetic or artificial fibres. The two most common ones are nylon and polyester. Nylon is made from two chemicals, adipic acid (AA) and hexamethylene diamine (HMD).

Therefore, the correct answer is option C.

State true or false.


Most of the plastics are resistant to strong acids and alkalies.

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  1. True

  2. False

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Correct Option: A
Explanation:

Plastics are not chemically reactive and they are non-corrosive. So, most of the plastics are resistant to strong acids and alkalies. Hence the given statement is True.

Which of the following is considered the first thermoplastic?

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  1. PVC

  2. Polystyrene

  3. Melamine

  4. Celluloid

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Correct Option: D
Explanation:

Celluloid, which is considered the first thermoplastic, made its appearance in the mid- 1800 s and reigned in the industry for approximately 100 years. During its peak production, it was used as a substitute for ivory. Today, it is used to make guitar picks.

Which of the following is a thermosetting process?

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  1. Vulcanization of rubber

  2. Polythene extrusion

  3. Injection molding of PVC

  4. None of above

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Correct Option: A
Explanation:

Vulcanization is a chemical process for converting natural rubber or related polymers into more durable materials via the addition of sulphur or other equivalent curatives or accelerators. Cross-linking introduced by vulcanization prevents the polymer chains from moving independently. As a result, when stress is applied the vulcanized rubber deforms, but upon release of the stress it reverts to its original shape.

State true or false.


Nylon is a thermosetting plastic.

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  1. True

  2. False

Show answer
Correct Option: B
Explanation:
Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling.
Examples: Nylon, PVC, polystyrene, etc.
On the opposite of that Thermosetting doesn't regain its shape after heating.
Nylon is a thermoplastic polymer. Hence the given statement is false.

Which of the following example is not a thermoset plastic?

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  1. Epoxy resin

  2. Melamine

  3. Urea formaldehyde

  4. Polyamide

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Correct Option: D

Which among the following is a poor conductor of heat and electricity?

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  1. Melamine

  2. Bakelite

  3. Both A and B

  4. None of above

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Correct Option: C
Explanation:

Bakelite is a thermosetting plastic which is one of the first plastic made from synthetic components. Bakelite was used for its electrical non-conductivity and heat-resistant properties in electrical insulators, radio, and telephone casings.

Similarly, Melamine resin is a thermosetting plastic used in high pressure decorative laminates, laminate floorings and dry erase boards.

_______ provides good heat and sound insulation.

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  1. Propylene

  2. Styrofoam

  3. Polythene

  4. Acrylic

Show answer
Correct Option: B
Explanation:

Polystyrene foam also known as Styrofoam is brittle in tension, lightweight, with good heat and sound insulation. It is available in blocks and used for product-modelling.