MCQ questions for class 8 Science Chapter 14 Chemical Effects of Electric Current
Question 1: What is the term for the flow of electric current through a conductor?
Voltage
Resistance
Current
Power
Question 2: Which of the following substances is commonly used as an electrolyte in a cell?
Saltwater
Distilled water
Sugar solution
Oil
Question 3: What is the term for the process in which electric current passes through a liquid and causes a chemical reaction?
Electrolysis
Magnetization
Conduction
Induction
Question 4: In electrolysis, which electrode is connected to the positive terminal of the battery?
Cathode
Anode
Both electrodes
None of the above
Question 5: What is the term for the metal deposited on an object during electrolysis?
Cathode
Anode
Electroplating
Electrode
Question 6: Which metal is commonly used for electroplating iron objects?
Copper
Gold
Silver
Zinc
Question 7: What is the term for the process of depositing a layer of any desired metal on another material by means of electricity?
Electrolysis
Magnetization
Electroplating
Galvanization
Question 8: What is the term for the metal that is coated on another metal during electroplating?
Cathode
Anode
Electroplating
Deposited metal
Question 9: What happens to the electrodes during electrolysis?
They dissolve
They remain unchanged
They become magnetic
They become hot
Question 10: Which of the following is not a chemical effect of electric current?
Electroplating
Electrolysis
Magnetization
None of the above
Question 11: What is the term for the process in which a metal object is coated with a thin layer of zinc to prevent corrosion?
Electrolysis
Magnetization
Electroplating
Galvanization
Question 12: Which metal is commonly used for galvanization?
Copper
Gold
Silver
Zinc
Question 13: What is the term for the negative electrode during electrolysis?
Cathode
Anode
Both electrodes
None of the above
Question 14: What is the term for the positive electrode during electrolysis?
Cathode
Anode
Both electrodes
None of the above
Question 15: Which of the following is not a common use of electroplating?
Decorative coatings
Preventing corrosion
Making magnets
Providing a reflective surface
Question 16: What is the term for the conducting solution in an electrolytic cell?
Electrode
Electrolyte
Conductor
Insulator
Question 17: Which of the following is not a common use of electrolysis?
Extracting metals from ores
Refining metals
Electroplating
Making magnets
Question 18: What is the term for the process of removing impurities from a metal using electricity?
Electroplating
Electrolysis
Magnetization
Electrowinning
Question 19: What is the term for the process in which a substance is decomposed by passing an electric current through it?
Electroplating
Electrolysis
Magnetization
Galvanization
Question 20: What is the term for the material that allows electric current to pass through it easily?
Insulator
Conductor
Semiconductor
Superconductor
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