Grade 8 Science Quiz: Synthetic Fibres and Plastics

What are three common uses of synthetic fibres?

• Clothing, upholstery, and ropes

• Medicine, automotive parts, and household appliances

• Food packaging, electronics, and construction materials

• Toys, kitchenware, and gardening tools

Name three types of plastics and their uses.

• 1. Polystyrene - used in food packaging and insulation.

• 2. Polyurethane - used in furniture, mattresses, and insulation.

• 3. Polyester - used in clothing, upholstery, and bedding.

• 1. Polyethylene - used in packaging, bottles, and containers. 2. Polypropylene - used in textiles, packaging, and automotive parts. 3. Polyvinyl chloride (PVC) - used in construction, healthcare, and automotive applications.

What are the properties of thermosetting plastics?

• Flexible, soften on heating, can be reshaped once set

• Transparent, melt on heating, can be reshaped once set

• Rigid, do not soften on heating, cannot be reshaped once set

• Soft, do not change on heating, can be reshaped once set

How does the use of single-use plastics impact the environment?

• Single-use plastics decompose quickly and do not harm wildlife

• Single-use plastics contribute to pollution, harm wildlife, and take hundreds of years to decompose, impacting the environment negatively.

• Single-use plastics help in reducing pollution

• Single-use plastics have no impact on the environment

Explain three uses of nylon as a synthetic fibre.

• Wood, metal, and leather

• Clothes, ropes, and carpets

• Plastic, cotton, and silk

• Tires, paper, and glass

List three different types of plastics based on their polymer structure.

• Thermosetting plastics, Thermoplastics, Elastomers

• Metallic plastics, Glassy plastics, Rubberized plastics

• Transparent plastics, Opaque plastics, Colored plastics

• Biodegradable plastics, Recycled plastics, Synthetic plastics

What are the properties of PVC (Polyvinyl Chloride) plastic?

• Low resistance to chemicals, high flexibility, and high cost

• Durability, resistance to chemicals, and low cost

• Fragile, easily degradable, and expensive

• High conductivity, low strength, and high cost

Discuss the environmental impact of plastic pollution on marine life.

• Marine life benefits from plastic pollution

• Plastic pollution has no impact on marine life

• Plastic pollution helps improve the habitat for marine life

• Plastic pollution can harm marine life through ingestion, entanglement, and habitat destruction.

Describe three uses of polyester as a synthetic fibre.

• Food packaging, insulation, and medical implants

• Clothing, upholstery, and industrial fabrics

• Car tires, paper towels, and glassware

• Construction materials, electronics, and kitchen utensils

Explain the differences between thermoplastics and thermosetting plastics.

• Thermoplastics are not affected by heat, while thermosetting plastics can be melted and reformed.

• Thermoplastics can only be used once, while thermosetting plastics can be reused multiple times.

• Thermoplastics are more durable than thermosetting plastics.

• Thermoplastics can be melted and reformed multiple times, while thermosetting plastics cannot be remelted once they are formed.