Tag: environmental impact: plastics

Questions Related to environmental impact: plastics

Which of the following is NOT true?

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  1. Thermosetting plastic are bad conductors of heat and electricity.

  2. Thermoplastics are good conductor of heat and electricity.

  3. Plastic do not get corroded easily.

  4. Plastic is also a polymer.

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Correct Option: B
Explanation:

Thermoplastic polymer can change their properties when heated and cooled. All plastics are bad conductors of heat and electricity.


Option B is correct.

Which of the following is a property of plastic?

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  1. Flame resistant

  2. Non-corrosive

  3. Mouldable

  4. All of the above

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Correct Option: D
Explanation:

The properties of the plastics are as follow:

  • They can be easily molded.
  • They are non-corrosive.
  • They are flame resistant.
  • They are a bad conductor of electricity.
Thus all the properties that are given in the options are properties of plastic.

Coating of melamine plastic is used as :

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  1. good conductor of heat

  2. strong and durable

  3. fire proofplastic

  4. plastic cook ware

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Correct Option: C

Plastics which when moulded once, cannot be softened by heating are called :

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  1. thermosetting plastics

  2. thermoplastics

  3. thermostat plastics

  4. mould plastics

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Correct Option: A

Which material is used for making:
(i) Saucepan handles
(ii) Electric plugs/switches/plugboards

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  1. Bakelite

  2. PVC

  3. Polythene

  4. Polyester

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Correct Option: A
Explanation:

(i) Saucspan handles are made of bakelite as it is a bad conductor of heat.
(ii) Bakelite is also a bad conductor of electricity so the electric plugs, switches, etc. are made of it.

What characteristic property of plastic makes it useful in making containers for storing food items?

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  1. They do not react with food stored in them

  2. They are poor conductors of electricity

  3. They are light weight and strong

  4. They are non-degradable.

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Correct Option: A,C
Explanation:

Since plastics do not react with water and air, they are noncorrosive in nature and are thus used for storage.

An example of thermosetting plastic, which is also a poor conductor of electricity, is:

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  1. polythene

  2. bakelite

  3. polyester

  4. PVC

Show answer
Correct Option: B
Explanation:

Bakelite is an example of thermosetting plastic which is also a poor conductor of electricity. Due to its insulating character, it is used for switches and other electrical insulators.
Option B is correct.


State True or False.

Plastics are resistant to corrosion.

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  1. True

  2. False

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Correct Option: A
Explanation:

The given statement is true. Plastics are resistant to corrosion and chemicals.

Statement: The articles made of thermoplastics can be recycled whereas the articles made of thermosetting plastics cannot be recycled.


State whether the given statement is true or false.

chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

  1. True

  2. False

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Correct Option: A
Explanation:
The intermolecular forces in thermoplastics are weaker while the intermolecular forces in thermosetting plastics are stronger. The thermosetting plastics cannot be moulded on heating. Thus the articles made of thermoplastics can be recycled whereas the articles made of thermosetting plastics cannot be recycled.

Hence, the given statement is $\text{true}$

A person has to make electric switches and plugs. Which material is recommended ?

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  1. Teflon

  2. Bakelite

  3. Rayon

  4. PVC

Show answer
Correct Option: B
Explanation:
Bakelite has high heat resistant property which makes it a poor conductor of heat and electricity.it is used for making electrical switches because it high heat resistance property protects us from electric shocks.
also it is used to make handles of cooking utensils because of this property it does not conduct heat and so the handles are prevented from becoming too hot and this makes it easy to handle the handles of cooking utensils.

Hence, the correct option is $\text{B}$