CBJ Core Knowledge and Fundamentals 4

Question 1

When measuring ring sizes in the United States, what tool is considered the most accurate for sizing a customer's finger?

Accepted Answer

A set of ring gauges (finger sizers)

Answer

A set of calibrated ring gauges (finger sizers) placed on the customer's finger provides the most accurate ring size because it accounts for knuckle size and comfort.

Question 2

What is the primary safety hazard associated with using cadmium-containing solders in jewelry?

Accepted Answer

Cadmium fumes are highly toxic and carcinogenic

Answer

Cadmium vaporizes at relatively low temperatures, and inhaling cadmium fumes causes severe respiratory damage and is classified as a human carcinogen.

Question 3

A jeweler notices that solder is balling up and not flowing into a joint. What is the most likely cause?

Accepted Answer

The joint surfaces are dirty or the flux has burned away

Answer

Solder requires clean metal surfaces and active flux to flow; dirty surfaces or burned flux prevent capillary action and cause solder to ball rather than flow.

Question 4

What does 'spring back' mean in the context of forming metal?

Accepted Answer

Metal returns partially toward its original shape after bending force is released

Answer

Spring back is the elastic recovery of metal that causes a bent piece to partially return toward its original shape when bending pressure is removed.

Question 5

Which gemstone has a refractive index of approximately 2.42, giving it exceptional brilliance?

Accepted Answer

Diamond

Answer

Diamond has a refractive index of approximately 2.42, the highest of common gemstones, which creates its characteristic brilliance and dispersion of light.

(CBJ) Certified Bench Jeweler Practice Test

(CBJ) Certified Bench Jeweler Practice Test

CBJ Core Knowledge and Fundamentals 4