Thermoplastics

Q. Nylon is a polymer made of chemical units called ___ .

Q.

What is plastic? Explain different types of plastics and their uses?

Q. Bulletproof glass is made up of:

1. Polycarbonate
2. PVC
3. Lexan
4. Polypropylene

Q. The plastics that can be remoulded on heating are called _______ and those which cannot be remoulded are called _______.

1. thermoplastics, thermosets
2. thermosets, thermoplastics
3. melamine, polystyrene
4. melamine, thermoplastics

Q.

(a) What are thermoplastics ? Give two examples of thermoplastics.

(b) What are thermosetting plastics? Give two examples of thermosetting plastics.

Q.

Question 15
Describe an activity to show that thermoplastic is a poor conductor of electricity.

Q.

Polythene and PVC are examples of

1. Thermosetting plastic

2. Rayon

3. Biodegradable substance

4. Thermoplastics

Q.

Why are thermoplastics not used for making frying pan handles ?

Q. Which one of the following is an example of thermoplastic?

1. Polyvinyl chloride
2. Melamine
3. Polyethene
4. Both (a) & (b)

Q.

Name the chemical used to make polyester?

Q.

Which of the following plastics do not have cross-links between their polymer chains?
A. Nylon
B. Melamine
C. Polyvinyl Chloride
D. Bakelite

1. A and B

2. A and C

3. C and D

4. B and C

Q.

Which of the following is not a thermoplastic polymer ?

(a) polyester (b) melamine (c) nylon (d) polyvinyl chloride

Q. Which of the following plastic is used to make the pipes used in water supply? Also, identify the type of plastic.

1. Plastic:- Polystyrene
   Type of plastic:- Thermoplastic
2. Plastic:- Polyvinyl chloride
   Type of plastic:-Thermoplastic
3. Plastic:- Melamine
   Type of plastic:-Thermosetting
4. Plastic:- Bakelite
   Type of plastic:- Thermosetting

Q. Properties of synthetic materials

Q.

Why is carbon black used in tyres?

Q.

Which of the following articles made of plastics 'can be recycled' and which 'cannot be recycled'?

1. Can be recycled: Plastic toys, Plastic covering on electrical wires, Plastic bottles

   Cannot be recycled: Telephone instruments, Cooker handles, Electric switches

2. Can be recycled: Plastic toys, Plastic bottles, Electric switches, Telephone instruments

   Cannot be recycled: Plastic covering on electrical wires, Cooker handles

3. Can be recycled: Telephone instruments, Cooker handles, Plastic bottles

   Cannot be recycled: Electric switches, Plastic toys, Plastic covering on electrical wires

4. Can be recycled: Plastic toys, Plastic covering on electrical wires, Plastic bottles, Cooker handles

   Cannot be recycled: Telephone instruments, Electric switches

Q.

Write the full form of PVC. Is it thermoplastic or thermosetting plastic ?

Q. Classify plastics on the basis of effect of heat on them.

Q. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?​

Q.

The monomer of polyester is ___ .

1. Dacron

2. Ethylene glycol

3. Ester

4. Ether

Q.

What Are Thermoplastic? Explain With Example

Q.

Assertion:- Bakelite is harder than polythene.

Reason:- Bakelite is harder because it is a cross-linked polymer.

1. Assertion:- True

   Reason:- True

2. Assertion:- True

   Reason:- False

3. Assertion:- False

   Reason:- False

4. Assertion:- False

   Reason:- True

Q. Name the type of plastic in which the monomers are arranged in a straight chain.

1. Melamine
2. Thermosetting plastic
3. Thermoplastics
4. Bakelite

Q. Polyethylene terephthalate belongs to which class of synthetic polymer?

1. Polyolefin
2. None of these
3. Polyester
4. Nylon

Q. Describe an activity to show that thermoplastic is a poor conductor of electricity.

Q. What is the significance of 6 and 10 in Nylon 6 10?

Q.

Give one use of teflon.

Q. Which among the following cannot be remoulded by heating?

1. Bakelite
2. Polythene
3. Melamine
4. Polyvinyl chloride

Q.

Differentiate between thermosetting plastics and thermoplastics using examples.

Q. Preethi was unable to penetrate a hot pin through a pipe made out of one of the following materials. The pipe is most probably made of ________.

1. bakelite
2. PVC
3. polythene
4. PET