COC Materials Science & Technology

Question 1

Which property describes a material's ability to return to its original shape after deformation without permanent change?

Accepted Answer

Elasticity

Answer

Plasticity

Answer

Viscoelasticity

Answer

Ductility

Question 2

Carbon fiber composite materials used in O&P are reinforced with carbon fibers primarily to improve which mechanical property?

Accepted Answer

Stiffness-to-weight ratio

Answer

Impact resistance

Answer

Thermal conductivity

Answer

Chemical resistance

Question 3

Thermoplastic materials used for custom orthotics are typically formed at temperatures between:

Accepted Answer

150–180°F (65–82°C)

Answer

300–350°F (149–177°C)

Answer

400–450°F (204–232°C)

Answer

500–550°F (260–288°C)

Question 4

What is the primary advantage of using titanium over steel in prosthetic structural components?

Accepted Answer

Higher strength-to-weight ratio

Answer

Lower cost

Answer

Greater flexibility

Answer

Better corrosion resistance only

Question 5

Viscoelastic materials exhibit which combination of properties?

Accepted Answer

Both viscous (time-dependent) and elastic (recoverable) behavior

Answer

Only elastic deformation under all loads

Answer

Permanent deformation under any stress

Answer

Constant stiffness regardless of loading rate

Question 6

Which type of polypropylene is most commonly used for thermoplastic AFO fabrication?

Accepted Answer

Copolymer polypropylene

Answer

Homopolymer polypropylene

Answer

High-density polyethylene

Answer

Acrylic resin