Science - Synthetic Fibres and Plastics: Grade 8

What are synthetic fibres?

• Naturally obtained fibres from Plants and Animals.

• Man-made fibres that are obtained from petrochemicals and synthesized in a laboratory by humans.

• They are obtained from both natural elements and synthesized in laboratory.

• All of the above

Which was the first true synthetic fibre?

• Polyester

• Silk

• Nylon

• Spandex

Rayon is also known as ___________________? ( Select 2 options)

• Natural fibre

• Semi synthetic fibre

• Thermoset Plastic

• Artificial Silk

Which fibre can be a substitute for wool?

(a)  

Advantages of Synthetic fibres: (Select 2 option)

• Stronger and more durable than natural fibres

• They are cheaper than natural fibres

• They are comfortable to wear

• They are expensive than natural fibres

What is the type of arrangement of polymers in Thermosetting Plastic?

• Linear arrangement of polymers

• Random arrangement of polymers

• Cross-linked arrangement of polymers

Which of the following are not the properties of Plastics?

• Thermal conductivity

• Electrical conductivity

• Flammability

• Sonority

What is the abbreviation/Shortform of Polyvinyl chloride? (All the letters in capital)

(a)  

Examples of Thermosetting Plastic?

• Teflon

• Terylene

• Melamine

• Bakelite

Which is the Strongest Synthetic fibre?

• Cotton

• Rayon

• Spandex

• Nylon