Chemical Effects of Electric Current Quiz - CBSE Class 8 Science

Free practice quiz: Chemical Effects of Electric Current (CBSE Class 8 Science). 15 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a chemical effect of electric current?

   1. Electroplating
   2. Electrolysis
   3. Heating of a wire
   4. Corrosion of metals
   Show answer

   Answer: C. Heating of a wire

   Heating of a wire is a heating effect, not a chemical effect. Electroplating, electrolysis, and corrosion of metals are all chemical changes caused by electric current.

2. What is the electrolyte in a simple electrolytic cell?

   1. A solid conductor
   2. An insulator
   3. A solution that conducts electricity
   4. A vacuum
   Show answer

   Answer: C. A solution that conducts electricity

   An electrolyte is a substance that conducts electricity when dissolved in water or molten.

3. How does the concentration of the electrolyte affect the rate of electroplating?

   1. Higher concentration leads to faster plating
   2. Lower concentration leads to faster plating
   3. Concentration has no effect
   4. It depends on the type of electrolyte
   Show answer

   Answer: A. Higher concentration leads to faster plating

   A higher concentration of ions in the electrolyte means more ions are available for reduction at the cathode, leading to a faster plating rate.

4. What are the necessary components for an electrolytic cell to function?

   1. Electrolyte, electrodes, power source
   2. Electrolyte, electrodes
   3. Electrodes, power source
   4. Electrolyte, power source
   Show answer

   Answer: A. Electrolyte, electrodes, power source

   All three are essential: an electrolyte to conduct electricity, electrodes for the reaction and power source to drive the current

5. How does changing the current strength affect the rate of electrolysis?

   1. Higher current, faster electrolysis
   2. Higher current, slower electrolysis
   3. No effect
   4. Depends on the electrolyte
   Show answer

   Answer: A. Higher current, faster electrolysis

   A stronger current means more charge flows through the cell, leading to a faster rate of electrochemical reactions.

Browse all Chemical Effects of Electric Current quizzes