Tag: environmental impact: plastics

Questions Related to environmental impact: plastics

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.

We come to a conclusion, that plastics are bad conductors of electricity from the following.

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  1. Refrigerators and freezers have a plastic foam core

  2. Electrical wires have a plastic covering

  3. Cooking pans have plastic handles

  4. We use to prepare parachutes

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Correct Option: A,B,C
Explanation:

Most of the commonly used household electronics like freezers, washing machine, etc are made of plastic since it is the bad conductor of electricity.

Which of the following is/are reasons of using plastics?
1.They are transparent.
2. They are cheap.
3. They can be moulded into diffrent shapes.

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  1. (1) only

  2. (2) only

  3. (1) and (3) only

  4. (2) and (3) only

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Correct Option: D
Explanation:
All three are correct. But the reason for their vast use is the less expenditure and re-usability. 
With the increased knowledge of plastics and the improved capabilities of machining equipment, the industry is now capable of producing plastic components to the same exacting standards as metallic components.
Plastics are cheaper than metals.  They are transparent and elastic material that could be molded when heated. Plastics are easy to reuse as they can be molded into different shapes can be designed for resist impact and dents, making it durable, strong, and stable.


Fibre obtained by chemical treatment of wood pulp is called:

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  1. natural Silk

  2. rayon

  3. nylon

  4. polyster

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Correct Option: B
Explanation:
Natural Silk: The protein fibre of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons.
Rayon: Rayon is a manufactured regenerated cellulose fibre. It is made from purified cellulose, primarily from wood pulp, which is chemically converted into a soluble compound.
Nylon: Nylon is a strong, light synthetic fibre. Nylon thread is made from the polymerization of an amine and an acid chloride. 
Polyester: Polyester is a synthetic polymer made of purified terephthalic acid or its dimethyl ester dimethyl terephthalate and mono ethylene glycol. 

Hence, the correct option is $B$

Which is NOT the general characteristics of plastics?

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  1. Good electrical insulators

  2. Acceptable acoustic insulation

  3. Resistant to corrosion and many chemical factors

  4. Have a high production cost

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Correct Option: D
Explanation:
The properties and characteristics of most plastics (though not always fulfilled in certain special plastics) are these:
Easy to work and shape,
Have a low production cost,
Possess low density,
Tend to be waterproof,
Good electrical insulators,
Acceptable acoustic insulation,
Good thermal insulation, but most can not withstand very high temperatures,
Resistant to corrosion and many chemical factors;