What is the main difference between thermoplastics and thermosetting plastics?

• Thermoplastics can be remoulded multiple times, while thermosetting plastics cannot.

• Thermosetting plastics can be remoulded multiple times, while thermoplastics cannot.

• Thermoplastics are always biodegradable, while thermosetting plastics are not.

• Thermosetting plastics are always biodegradable, while thermoplastics are not.

Which of the following is a common environmental impact of plastics?

• Plastics decompose quickly, enriching the soil.

• Plastics contribute to ocean pollution and harm marine life.

• Plastics are a renewable resource and reduce carbon footprint.

• Plastics improve air quality by absorbing pollutants.

Which type of plastic is known for its high impact resistance and is often used in safety helmets?

• Polyethylene Terephthalate (PET)

• Polyvinyl Chloride (PVC)

• Polycarbonate (PC)

• Polystyrene (PS)

What property of plastics makes them suitable for use as electrical insulators?

• High thermal conductivity

• High electrical conductivity

• Low electrical conductivity

• High density

Which of the following plastics is commonly used for making bottles and is known for being lightweight and strong?

• Polyethylene Terephthalate (PET)

• Polypropylene (PP)

• Polystyrene (PS)

• Polyvinyl Chloride (PVC)

What is a significant disadvantage of using biodegradable plastics?

• They are more durable than traditional plastics.

• They decompose too quickly for practical use.

• They can still produce microplastics if not properly managed.

• They are always more expensive than traditional plastics.

Which plastic is known for its flexibility and is often used in plumbing pipes?

• Polyethylene (PE)

• Polyvinyl Chloride (PVC)

• Polystyrene (PS)

• Polycarbonate (PC)

Which of the following is a thermosetting plastic commonly used in electrical fittings?

• Polyethylene (PE)

• Bakelite

• Polypropylene (PP)

• Polystyrene (PS)

What is the effect of UV radiation on most plastics?

• It strengthens the plastic.

• It causes the plastic to become more flexible.

• It can cause the plastic to degrade and become brittle.

• It has no effect on plastics.

Which type of plastic is commonly used in the production of food containers due to its resistance to moisture and chemicals?

• Polyethylene (PE)

• Polypropylene (PP)

• Polystyrene (PS)

• Polyvinyl Chloride (PVC)