What is a thermoplastic?
A
A plastic that sets permanently on heating
B
A plastic that softens on heating and can be remolded
D
A plastic that cannot be molded
Analysis & Theory
Thermoplastics soften when heated and can be reshaped multiple times without undergoing chemical change.
What is a thermosetting plastic?
A
A plastic that softens on heating
B
A plastic that sets permanently on heating and cannot be remolded
D
A biodegradable plastic
Analysis & Theory
Thermosetting plastics undergo a chemical change when heated and *cannot be remolded*.
Which of the following is an example of a thermoplastic?
Analysis & Theory
Polyethylene is a *thermoplastic* commonly used in bottles, bags, and containers.
Which of the following is an example of a thermosetting plastic?
Analysis & Theory
Bakelite is a *thermosetting plastic*, used in electrical components due to its heat resistance.
Thermoplastics are preferred for which property?
A
Can be remolded multiple times
B
Heat-resistant and permanent
Analysis & Theory
Thermoplastics can be *heated and reshaped multiple times*, making them versatile and recyclable.
Thermosetting plastics are preferred for which property?
A
High heat resistance and permanent shape
C
Lightweight and flexible
D
Low strength applications
Analysis & Theory
Thermosetting plastics have *high heat resistance* and retain their shape permanently, ideal for electrical and mechanical uses.
Which plastic type is suitable for making electrical switches and circuit boards?
Analysis & Theory
Thermosetting plastics like Bakelite are *heat-resistant and insulating*, ideal for electrical applications.
Which plastic type is widely used for packaging and containers?
Analysis & Theory
Thermoplastics like polyethylene and polypropylene are *lightweight, flexible, and easily molded*, making them ideal for packaging.
Which of the following is a disadvantage of thermoplastics compared to thermosetting plastics?
A
Can soften at high temperatures
Analysis & Theory
Thermoplastics *soften at high temperatures*, limiting their use in heat-resistant applications.
Which of the following is a disadvantage of thermosetting plastics compared to thermoplastics?
A
Cannot be remolded or recycled
Analysis & Theory
Thermosetting plastics cannot be remolded after setting, making *recycling difficult*.