Quiz 10

Question 1

Which of the following statements is true about polymers?

Answer 1

All the above statements are correct
All the shear-thinning fluids are thixotropic
All the thixotropic fluids are shear-thickening All the thixotropic fluids are shear thinning.

Question 2

Which of the following statements is true about polymers?

Answer 2

Highly cross-linked polymers show sharp melting points
Amorphous polymers show a rise in relaxation modulus above the glass transition temperature
Crystalline polymers show a sharp transition in molecular relaxation modulus at the glass transition temperature
Amorphous polymers show a sharp decline in molecular relaxation modulus above the glass transition temperature .

Question 3

Which of the following statements are true about polymers?

Answer 3

Vehicle tires for winter conditions should have a low glass-transition temperature.
Vehicle tires for winter conditions should have a higher glass-transition temperature
Vehicle tires are not affected by the glass transition temperature
Vehicles tires with very high elastic moduli suit best for winter conditions

Question 4

Which of the following is an example of addition polymerization

Answer 4

Polyethylene

Question 5

What is the main reason for injection moulding being an attractive method for the production of complex shapes or components with fine details?

Answer 5

When melted, thermoplastics are a viscous liquid that can flow into fine cavities under pressure.