Title: 1.4 Solder and Flux Quiz
Course: Electronics Assembly & Soldering (Sandbox) > Section: Module 1: About Soldering

Q: What is solder?
- An alloy that evaporates slowly.
- An alloy that becomes liquid when heated, and then solidifies when it cools.
- An alloy that is extremely malleable.
- Always a mixture of tin and lead.
A: An alloy that becomes liquid when heated, and then solidifies when it cools.

Q: The "eutectic point" is...
- the point at which a substance wets or melts
- the point at which a substance starts to resonate with the air around it
- a substance's boiling point
- a substance's evaporation point
A: the point at which a substance wets or melts

Q: Wetting is...
- the amount of "runniness" that solder can achieve
- the amount of "shininess" that solder has
- the amount of solder you have to wipe off your circuit board
- when solder, while in a liquid state, is spread across the surface of two metals to form a bond.
A: when solder, while in a liquid state, is spread across the surface of two metals to form a bond.

Q: Solder paste is...
- solder mixed with paste
- solder mixed with flux and other agents
- solder mixed with corn starch
- solder mixed with air
A: solder mixed with flux and other agents

Q: Oxidation in metal is...
- residue or tarnish formed by tightly bonded oxygen molecules
- residue or tarnish formed by oxygenated dirt particles
- a layer of greasy dirt caused by oxygen molecules
- tarnish that can be rubbed off
A: residue or tarnish formed by tightly bonded oxygen molecules

Q: Flux is used to...
- clean the area to be soldered
- enhance conduction of heat from the soldering iron tip to the joint
- ensure that the solder flows evenly
- all of the above
A: all of the above

Q: Flux strength is measured in terms of activity. The more active the flux, _____.
- the more effectively it adheres to the surface of the metal
- the less effectively it cleans
- the more effectively it cleans
- the less effectively it adheres to the surface of the metal
A: the more effectively it cleans

Q: Fluxes fall into two broad categories:
- rosin-soluble and water-based
- rosin-based and water-based
- rosin-based and water soluble
- water soluble and water insoluble
A: rosin-based and water soluble

Q: RMA fluxes are more active than R fluxes, and leave some _____.
- tarnish
- sheen
- black stuff
- residue
A: residue

Q: Water-soluble fluxes are not derived from water, but from...
- organic molecular compounds
- synthetic resins and organic acids
- highly purified rosins and resins
- a synthetic form of hydrochloric acid
A: synthetic resins and organic acids

Q: As flux heats and melts, activators in it break down and create _____.
- ammonia or hydrochloric acid
- acrylic gel
- acetylsalicylic acid
- fumey stuff
A: ammonia or hydrochloric acid

Q: The residue of no-clean fluxes are neither corrosive nor _____.
- inductive
- resistive
- conductive
- capacitive
A: conductive

Q: In SAC 305 lead-free solder, the 305 refers to...
- 3% aluminum (Au) and 0.5% copper (Cu)
- 3% silver (Au) and 0.5% selenium (Cu)
- 3% aluminum (Au) and 0.5% selenium (Cu)
- 3% silver (Au) and 0.5% copper (Cu)
A: 3% silver (Au) and 0.5% copper (Cu)