Questions about Electroplating
Electroplating – Multiple Choice Questions
Questions
1. What is electroplating?
A) The process of removing metal from a surface using electricity
B) The process of coating a metal object with a thin layer of another metal using electrical current
C) The process of melting metals together
D) The process of converting metals into salts
E) The process of distilling metals
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2. In electroplating, the object to be plated acts as which electrode?
A) Anode
B) Cathode
C) Salt bridge
D) Reference electrode
E) Neutral electrode
3. What happens at the cathode during electroplating?
A) Metal ions are oxidized to metal atoms
B) Metal ions are reduced and deposited on the cathode
C) Gas is produced
D) The electrode dissolves
E) The electrode releases electrons
4. What is the function of the anode in electroplating?
A) To gain electrons
B) To dissolve and release metal ions into the solution
C) To produce gases
D) To act as a neutral support
E) To prevent current flow
5. Which of the following metals is commonly used for electroplating to prevent rust?
A) Iron
B) Zinc
C) Aluminum
D) Copper
E) Lead
6. Why is a salt solution used in the electroplating bath?
A) To provide ions for the plating process
B) To increase the temperature
C) To produce gases
D) To neutralize the electrodes
E) To prevent current flow
7. What is the role of electricity in electroplating?
A) To heat the metal
B) To drive the redox reactions that deposit metal on the cathode
C) To evaporate the solution
D) To melt the electrodes
E) To remove impurities
8. Which of the following metals is often electroplated onto jewelry for a shiny appearance?
A) Nickel
B) Iron
C) Zinc
D) Silver
E) Tin
9. If copper is being electroplated onto a metal object, what is the source of copper ions?
A) Copper anode dissolving in the electrolyte
B) Copper cathode gaining electrons
C) Water molecules
D) Hydrogen ions
E) Oxygen molecules
10. What is a common problem in electroplating that affects coating uniformity?
A) Uneven current distribution
B) Excessive temperature
C) No electrolyte present
D) Too much water
E) Electrode melting
11. In electroplating, what would happen if the current is too high?
A) Faster and better coating
B) Poor adhesion and rough deposits
C) No effect
D) The electrolyte evaporates
E) The metal dissolves completely
12. Which parameter is NOT critical in electroplating?
A) Concentration of metal ions in solution
B) Temperature of the bath
C) pH of the electrolyte
D) Color of the electrodes
E) Current density
13. What happens if the anode in an electroplating bath is inert (does not dissolve)?
A) The plating metal ions in solution will eventually be used up
B) The cathode will dissolve instead
C) The solution becomes acidic
D) No metal deposits on cathode
E) Electroplating will proceed faster
14. Which of the following is NOT an advantage of electroplating?
A) Corrosion resistance
B) Improved appearance
C) Increased hardness
D) Increased weight with no surface change
E) Electrical conductivity improvement
15. What metal is commonly used to electroplate car bumpers for corrosion protection?
A) Lead
B) Zinc
C) Nickel
D) Gold
E) Silver
16. What is the effect of agitation or stirring in the electroplating bath?
A) Slows down plating
B) Improves uniformity of plating by enhancing ion movement
C) Causes electrode degradation
D) Raises the boiling point of the solution
E) Produces more gases
17. What is the standard unit for measuring current density in electroplating?
A) Amperes (A)
B) Amperes per square meter (A/m²)
C) Volts (V)
D) Ohms (Ω)
E) Coulombs (C)
18. What happens at the cathode in electroplating if the metal ion concentration drops too low?
A) The plating rate increases
B) The metal deposits become rough and poor quality
C) The electrolyte boils
D) The anode dissolves rapidly
E) No reaction occurs
19. In electroplating, the quality of the coating depends mainly on:
A) The voltage only
B) The type of metal used only
C) Current density, temperature, electrolyte concentration, and pH
D) The size of the bath only
E) The time of the day
20. Which of the following metals is often electroplated to improve electrical conductivity?
A) Gold
B) Zinc
C) Lead
D) Iron
E) Aluminum
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Answers and Explanations
1. B – Electroplating is coating a metal object with a thin layer of another metal using electricity.
2. B – The object to be plated is the cathode where metal ions are reduced and deposited.
3. B – Metal ions in solution gain electrons at the cathode and form a metal coating.
4. B – The anode dissolves, releasing metal ions into the solution.
5. B – Zinc is commonly used to galvanize iron or steel to prevent rust.
6. A – The salt solution provides metal ions and allows current to flow.
7. B – Electricity drives redox reactions to deposit metal on the cathode.
8. D – Silver is often electroplated for shiny jewelry finishes.
9. A – Copper ions come from the copper anode dissolving into the electrolyte.
10. A – Uneven current causes non-uniform plating thickness.
11. B – Too high current causes rough, poorly adherent deposits.
12. D – The color of electrodes does not affect electroplating.
13. A – With inert anode, metal ions aren’t replenished and get depleted.
14. D – Electroplating does increase weight but mainly changes surface properties.
15. C – Nickel is widely used for corrosion-resistant plating on car parts.
16. B – Agitation improves uniform ion distribution and plating quality.
17. B – Current density is measured in amperes per square meter (A/m²).
18. B – Low metal ion concentration causes poor quality and rough deposits.
19. C – Coating quality depends on current density, temperature, ion concentration, and pH.
20. A – Gold is used to improve electrical conductivity and corrosion resistance.
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