Tag: plastic

Questions Related to plastic

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

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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

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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.

Define plasticity :

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  1. Ability to regain its original shape.

  2. Ability to flow when subjected to stress.

  3. Ability to change shape permanently.

  4. Both b and c.

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Correct Option: D
Explanation:

Plasticity,  ability of certain solids to flow or to change shape permanently when subjected to stresses of intermediate magnitude between those producing temporary deformation, or elastic behaviour, and those causing failure of the material, or rupture.

 Plasticity enables a solid under the action of external forces to undergo permanent deformation without rupture.

Plastics are ____________ in water.

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  1. highly soluble

  2. slightly soluble

  3. insoluble

  4. sparingly soluble

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Correct Option: C
Explanation:

Plastics are insoluble in water and it cannot be dissolved in water.

This is because of the non-polar nature of the plastic.

When plastics are burnt toxic substances are released into air causing ___________ pollution.

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  1. water

  2. air

  3. soil

  4. None of these

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Correct Option: B
Explanation:

When plastics are burnt toxic substances are released into $air$ causing air pollution. The sentence is self-explanatory.