COC Materials Science & Technology 2

Question 1

The Shore A hardness scale is used to measure the hardness of which category of materials relevant to O&P?

Accepted Answer

Soft elastomers and gel liners

Answer

Shore A measures the hardness of soft rubbers, silicones, and gel materials, making it the standard for evaluating prosthetic liners and cushioning pads.

Question 2

Lamination resin systems in O&P typically consist of which two components mixed before application?

Accepted Answer

Base resin and catalyst (hardener)

Answer

Lamination resins are two-part systems where the base resin crosslinks when mixed with a catalyst or hardener to form a rigid composite structure.

Question 3

Silicone liner suspension for transtibial prostheses primarily functions through which mechanism?

Accepted Answer

Locking pin or shuttle lock engaging a distal receptacle

Answer

The most common silicone liner suspension uses a distal locking pin that clicks into a receiver in the socket, providing secure suspension.

Question 4

Which fiber orientation in a carbon fiber layup provides the greatest resistance to bending in a single direction?

Accepted Answer

Unidirectional (0°) fibers aligned with the bending axis

Answer

Unidirectional fibers aligned with the primary load axis provide maximum stiffness and strength in that direction by fully utilizing fiber tensile modulus.

Question 5

Creep in thermoplastic orthotic materials refers to:

Accepted Answer

Slow permanent deformation under sustained load over time

Answer

Creep is the time-dependent, progressive deformation of a material under constant stress, which can cause orthotics to lose their molded shape over months of use.

COC - Certified Orthotic and Prosthetic Practitioner Practice Test

COC - Certified Orthotic and Prosthetic Practitioner Practice Test

COC Materials Science & Technology 2