Characteristics of Plastics

Q. Which of the following polymers has a structure as shown?

1. High-density polythene
2. Low-density polythene
3. Polyvinyl chloride
4. Bakelite

Q.

Explain why, plastic containers are preferred for storing food.

Q.

Assertion: Bakelite is used for making electric switches and plugs.

Reason: Bakelite is a poor conductor of heat and electricity.

1. Both assertion and reason are correct and the reason is the correct explanation of assertion.

2. Both assertion and reason are correct, but the reason is not the correct explanation of assertion.

3. The assertion is correct but the reason is incorrect

4. The assertion is incorrect but the reason is correct

Q.

Write one disadvantage of plastic.

Q.

Write a few applications of conductors and insulators.

Q.

Plastic articles are available in all possible shapes and sizes. Can you tell why?

Q.

Assertion: Bakelite is copolymer
Reason: Bakelite is a thermosetting material

1. Both assertion and reason are correct, reason is correct explanation of assertion
2. Both assertion and reason are correct, reason is not the correct explanation of assertion
3. 
   

   Assertion is correct but reason is incorrect.

4. Assertion is incorrect but reason is correct.

Q.

Question 10
Give examples to show that plastics are non-corrosive in nature.

Q.

Which plastic is used in making parts of refrigerators, gears of machines and toys?

1. Polyethylene

2. Polystyrene

3. Bakelite

4. Polyester

Q.

The kind of plastic is used for making electrical switches, ashtrays, handles of electricity, iron, etc?

Q.

Explain the difference between thermoplastic and thermosetting plastics.

Q. Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.

Q. Which of the following correctly connect items in column - I with column - II
Column – I Column – II
A. Nylon P. Thermoplastic
B. PVC Q. Thermosetting plastic
C. Bakelite R. Fibre

1. $A\to Q,B\to R,C\to P$
2. $A\to Q,B\to P,C\to R$
3. $A\to R,B\to P,C\to Q$
4. $A\to R,B\to Q,C\to P$

Q.

Assertion:- Plastic tanks are more preferred as compared to steel tanks for water storage.

Reason:- Plastic is more economical, lightweight and corrosion resistant.

1. Assertion:- True

   Reason:- False

   Reason is not the correct explanation of assertion

2. Assertion:- True

   Reason:- True

   Reason is the correct explanation of assertion.

3. Assertion:- False

   Reason:- True

4. Assertion:- False

   Reason:- False

Q. Bakelite is used as handles in frying pans because

1. Good conductor of heat
2. It is an alloy
3. Bad conductor of heat
4. (a) and (c) above.

Q.

Who invented the plastic? There has been so much trouble nowadays because of that inventor.*who is he*

Q. Question 8
Which of the following represents the correct match for items in Column A with those in Column B.
$\begin{array}{cc}\text{Column A}& \text{Column B}\\ \text{I. Nylon}& \text{(i) Thermoplastic}\\ \text{II. PVC}& \text{(ii) Thermosetting plastic}\\ \text{III. Bakelite}& \text{(iii) Fibre}\end{array}$

(a) I-(ii), II-(iii), III-(i)
(b) I-(iii), II-(i), III-(ii)
(c) I-(ii), II-(i), III-(iii)
(d) I-(iii), II-(ii), III-(i)

Q.

Is wood elastic?

Q. Which thermoplastic can resist a relatively higher amount of heat without melting or getting deformed?​

1. Teflon
2. Polystyrene
3. Melamine
4. Polythene

Q.

Plastics give out harmful chemicals when burnt.

1. True

2. False

Q. Fitting reaction

Q. Which of the following represents the correct match for items in Column A with those in Column B ​

Column A	Column B
I.	Nylon	I.	Thermoplastic
II.	PVC	II.	Thermosetting​plastic
III.	Bakelite	III.	Fibre

1. I-(ii), II-(iii), III-(i)​
2. I-(iii), II-(i), III-(ii)​
3. I-(ii), II-(i), III-(iii)​
4. I-(iii), II-(ii), III-(i) ​

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. Which of the following statements about plastics are true?
(i) Thermosetting and have linear arrangement of monomers.
(ii) Plastics with cross linked monomers are bioderadable.
(iii) Most of the thermoplastics can be recycled.
(iv) Plastics do not react with water and air.

1. (i), (iii) and (iv)
2. (iii) and (iv)
   
3. (i) and (iv)
4. (i) and (ii)

Q. 'I am a very familiar form of polyester and used for making bottles, utensils, films, wires.' Identify.

1. None of the above
2. PET
3. Plastic
4. Rayon

Q.

Polythene and PVC are examples of

1. Thermosetting plastic

2. Biodegradable substance

3. Rayon

4. Thermoplastics

Q. Unscramble the jumbled words given below, related to synthetic materials.​
(a) anory ​
(b) lopmery ​
(c) relyteen ​
(d) laspict​
(e) yespolter ​
(f) felton​

Q.

The kind of plastic, which can be softened and molded only once?

Q. Which of the following statements about plastics are true?
(i) Thermosetting and have linear arrangement of monomers.
(ii) Plastics with cross linked monomers are bioderadable.
(iii) Most of the thermoplastics can be recycled.
(iv) Plastics do not react with water and air.

1. (i), (iii) and (iv)
2. (iii) and (iv)
   
3. (i) and (ii)
4. (i) and (iv)

Q. The uniform worn by firefighters has a coating of ________, inorder to make it fire retardant.

1. rayon
2. nylon
3. melamine
4. silk