Tag: environmental impact: plastics

Questions Related to environmental impact: plastics

Nylon is obtained by:

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  1. treating wood pulp

  2. solidifying water

  3. mixing coal, air and water

  4. mixing chemicals

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Correct Option: C
Explanation:

Nylon was first commercially synthesized fibre. The production of nylon was started almost simultaneously in New York and London, thus it got its name (NY for New York and Lon for London) as nylon. Nylon is synthesized from coal, water and air. Fibre of nylon is very strong and it also resembles silk.

Bakelite is an example of ___.

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  1. elastomer

  2. fibre

  3. thermoplastic

  4. thermosetting polymer

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Correct Option: D
Explanation:

A thermosetting plastic, also known as a thermoset, is a polymer material that irreversibly cures. The cure may be induced by heat, generally above $200^o C$ $(392\ F)$, through a chemical reaction or a suitable irradiation.
$Bakelite$ is one example of this type.

State True or False :

Most of the plastics are biodegradable.

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  1. True

  2. False

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Correct Option: B
Explanation:

Most of the plastics are non-biodegradable.


Hence the given statement is false.

Polystyrene and PVC are thermoplastics.

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  1. True

  2. False

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Correct Option: A
Explanation:

Polymer of styrene and vinyl chloride (polystyrene and PVC)  can be repeatedly melted and re-molded into new products and are 100% recyclable. 


Therefore they are examples of thermoplastic. Other examples of thermoplastics include polythene (PE), polypropylene (PP), nylons, etc.

Therefore, option A is correct.

Which of the following will be suitable for coating dress materials of fire - men ?

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  1. Nylon

  2. Polyster

  3. Melamine

  4. Acrylic

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Correct Option: C
Explanation:

Melamine have properties to interfere with the combustion in many different ways. Moreover, it can withstand high temperature, it is corrosion resistant and easy to handle.

Consider the following statements-


I. weakest intermolecular forces are present in elastomers.

II. Fibers possess a crystalline nature.


III. Ionic bonds are present in thermoplastic polymers.

Select the correct option from the following:
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  1. I and II

  2. II and III

  3. I and III

  4. I,II and III

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Correct Option: A
Explanation:
Elastomers are rubber like solid polymers in which polymer chains are hold together by weakest intermolecular forces.
Eg : Natural rubber
Fibers are thread-like polymers & can be woven into fabrics. They possess high tensile strength & are crystalline in nature.
Eg ; Nylon $6,6$.

Hence, the correct option is A.

Thermosetting plastics cannot be softened by heating because:

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  1. they are cross linked polymers with hydrogen bonds b/w each other.

  2. they are linear chains of polymers

  3. they are large cross-linked molecules with strong covalent bonds b/w the atoms along each chains

  4. they are large cross-linked molecules with strong electrovalent bonds between the atom along each chain.

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Correct Option: A
Explanation:

Thermosetting polymers are formed from monomers of viscous state which changes irreversibly on heating into an infusible insoluble polymer. They have high crosslinks due to which they are rigid.

Which of the following properties of plastic make it most convenient to use?

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  1. It is non-reactive

  2. Light, strong and durable

  3. Easily remouldable

  4. All of the above

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Correct Option: D
Explanation:

Plastics are non-reactive at room temperature and others are highly reactive.

Because of lower density than metals, plastic is light, strong and durable so can be molded in different shapes and sizes easily.
So all the options are correct, all are properties of plastic.

Option D is correct answer.

Which one among the following is a thermosetting plastic?

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  1. PVC

  2. PVA

  3. Bakelite

  4. Perspex

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Correct Option: C
Explanation:
Bakelite is another name of phenol formaldehyde which is a thermosetting plastic so bakelite is a thermosetting plastic.

Plastic which has cross-linked (3D) structure and is generally made by the condensation polymerization method is called thermosetting plastic. It can't be reused once it is processed.

Which of the following is not correct regarding terylene ?

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  1. Condensation polymer

  2. Synthetic fibre

  3. Step-growth polymer

  4. Known as dacron

  5. Thermosetting plastic

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Correct Option: E
Explanation:

Terylene is a synthetic polymer formed by the condensation polymerization reaction of terephthalic acid and ethylene glycol with the release of a methanol molecule. 


It forms by a step-growth polymerization mechanism in which a bi-functional or multifunctional monomer react to form the first dimer, then trimer, longer oligomer and eventually long-chain polymers. 

It is also called as Dacron and is a thermoplastic, which can be remelted time and again without producing any change.