Synthetic Fibres and Plastics Quiz - CBSE Class 8 Science

Free practice quiz: Synthetic Fibres and Plastics (CBSE Class 8 Science). 12 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a synthetic fibre?

   1. Polyester
   2. Nylon
   3. Cotton
   4. Acrylic
   Show answer

   Answer: C. Cotton

   Cotton is a natural fibre, while polyester, nylon, and acrylic are synthetic fibres.

2. Which synthetic fibre is known for its strength and elasticity?

   1. Polyester
   2. Rayon
   3. Nylon
   4. Acrylic
   Show answer

   Answer: C. Nylon

   Nylon is known for its strength and elasticity, making it suitable for various applications.

3. Explain the difference between thermoplastic and thermosetting plastics.

   1. Thermoplastics can be remoulded, thermosetting plastics cannot
   2. Thermosetting plastics can be remoulded, thermoplastics cannot
   3. Both can be remoulded
   4. Neither can be remoulded
   Show answer

   Answer: A. Thermoplastics can be remoulded, thermosetting plastics cannot

   Thermoplastics soften on heating and can be remoulded, while thermosetting plastics undergo irreversible chemical changes on heating.

4. Discuss the advantages and disadvantages of using polyester in clothing.

   1. Advantages: Durability, wrinkle resistance; Disadvantages: Poor breathability, can retain sweat
   2. Advantages: Breathability, comfort; Disadvantages: Easily wrinkled, less durable
   3. Advantages: Low cost; Disadvantages: easily damaged
   4. Advantages: Softness; Disadvantages: easily torn
   Show answer

   Answer: A. Advantages: Durability, wrinkle resistance; Disadvantages: Poor breathability, can retain sweat

   Polyester is durable and wrinkle-resistant but can trap heat and moisture.

5. Analyze the impact of microplastics from synthetic fibres on marine ecosystems.

   1. No significant impact
   2. Positive impact
   3. Negative impact due to ingestion and entanglement
   4. Neutral impact
   Show answer

   Answer: C. Negative impact due to ingestion and entanglement

   Microplastics from synthetic fibres harm marine life through ingestion and entanglement.

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