Chapter 14 Chemical Effects of Electric Current Class 8 MCQ

Chemical Effects of Electric Current Class 8 MCQ is an important part of NCERT Class 8 Science Chapter 14 MCQ practice. This chapter explains how electricity shows different chemical effects of electric current such as good conductors and poor conductors, electroplating, and other real-life applications. To help students revise quickly, we have prepared Class 8 Science Chapter 14 multiple choice questions and objective questions with answers. 

These Chemical Effects of Electric Current questions and answers are useful for school exams as they are designed according to the CBSE Class 8 Science Chapter 14 objective questions pattern. Students can also practice with our Chemical Effects of Electric Current Class 8 MCQ with answers PDF to prepare better. Solving these important Class 8 Science one-mark questions improves speed, accuracy, and confidence for exams.

Chemical Effects of Electric Current Class 8 MCQ

Get exam-ready with Chemical Effects of Electric Current Class 8 MCQ based on NCERT Science Chapter 14. This chapter explains how electricity produces chemical changes like electrolysis, electroplating, and the difference between good conductors and poor conductors. Practicing these Class 8 Science Chapter 14 multiple choice questions with answers will help you understand key concepts and improve speed and accuracy in exams.

Below we are sharing the most important MCQs from Chemical Effects of Electric Current Class 8 to make your revision simple and effective.

Class 8 Science Chapter 14 Multiple Choice Questions with Answers

Q1. Which device is used to test the conduction of electricity in a liquid?
(a) LED
(b) Bulb
(c) Tester
(d) Ammeter
Answer: (c) Tester

Q2. The passage of electric current through a liquid causes:
(a) Physical effects
(b) Chemical effects
(c) Magnetic effects
(d) Both (b) and (c)
Answer: (d) Both (b) and (c)

Q3. Which of the following is a good conductor of electricity?
(a) Pure water
(b) Distilled water
(c) Lemon juice
(d) Plastic
Answer: (c) Lemon juice

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Q4. Which of these is a poor conductor of electricity?
(a) Vinegar
(b) Tap water
(c) Distilled water
(d) Salt solution
Answer: (c) Distilled water

Q5. The chemical effect of electric current is mainly used in:
(a) Heating
(b) Electroplating
(c) Magnetism
(d) None of these
Answer: (b) Electroplating

Q6. Which gas is released when electric current passes through water?
(a) Carbon dioxide
(b) Oxygen and Hydrogen
(c) Nitrogen
(d) Ammonia
Answer: (b) Oxygen and Hydrogen

Q7. The process of depositing a layer of metal on another metal using electricity is called:
(a) Electrolysis
(b) Electroplating
(c) Magnetization
(d) Conduction
Answer: (b) Electroplating

Q8. Electroplating of iron objects is usually done with:
(a) Copper
(b) Gold
(c) Chromium
(d) Aluminium
Answer: (c) Chromium

Q9. Which of these is used for electroplating jewellery?
(a) Chromium
(b) Silver and Gold
(c) Aluminium
(d) Iron
Answer: (b) Silver and Gold

Q10. Which of the following liquids is the poorest conductor of electricity?
(a) Salt solution
(b) Vinegar
(c) Sugar solution
(d) Lemon juice
Answer: (c) Sugar solution

Q11. The glowing of a bulb in a tester indicates:
(a) The liquid is a poor conductor
(b) The liquid is a good conductor
(c) The circuit is incomplete
(d) The bulb is fused
Answer: (b) The liquid is a good conductor

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Q12. In electroplating, the metal object to be coated is connected to the:
(a) Positive terminal
(b) Negative terminal
(c) Either positive or negative
(d) None of these
Answer: (b) Negative terminal

Q13. Which of the following metals is commonly used in electroplating to protect steel from rusting?
(a) Copper
(b) Chromium
(c) Zinc
(d) Aluminium
Answer: (c) Zinc

Q14. The instrument used to measure small currents in a circuit is called:
(a) Voltmeter
(b) Ammeter
(c) Galvanometer
(d) Ohmmeter
Answer: (c) Galvanometer

Q15. Which effect of electric current is used in a geyser?
(a) Magnetic effect
(b) Heating effect
(c) Chemical effect
(d) None of these
Answer: (b) Heating effect

Q16. Which of the following is not an application of the chemical effect of electric current?
(a) Electroplating
(b) Electrolysis
(c) Heating water in an electric heater
(d) Extraction of metals
Answer: (c) Heating water in an electric heater

Q17. Electroplating is widely used in industry for:
(a) Decoration and protection
(b) Heating
(c) Magnetization
(d) None of these
Answer: (a) Decoration and protection

Q18. Which solution is commonly used in car batteries?
(a) Distilled water
(b) Sulphuric acid solution
(c) Lemon juice
(d) Sugar solution
Answer: (b) Sulphuric acid solution

Q19. Which of the following is a conductor of electricity?
(a) Petrol
(b) Kerosene
(c) Vinegar
(d) Plastic
Answer: (c) Vinegar

Q20. When electric current is passed through copper sulphate solution, copper gets deposited on which electrode?
(a) Positive
(b) Negative
(c) Both
(d) None
Answer: (b) Negative

Q21. Which of the following is not a chemical effect of electric current?
(a) Gas bubbles are formed
(b) Metal is deposited
(c) Solution colour changes
(d) Production of sound
Answer: (d) Production of sound

Q22. Which is the best conductor of electricity among the following?
(a) Pure water
(b) Lemon juice
(c) Salt solution
(d) Distilled water
Answer: (c) Salt solution

Q23. In electroplating, the electrolyte should contain:
(a) Salts of the metal to be deposited
(b) Sugar solution
(c) Distilled water
(d) Oil
Answer: (a) Salts of the metal to be deposited

Q24. Electroplating improves:
(a) Strength of the object
(b) Magnetic property of the object
(c) Appearance and resistance to corrosion
(d) Weight of the object
Answer: (c) Appearance and resistance to corrosion

Q25. Which of the following effects is seen when electric current is passed through water?
(a) Gas bubbles form
(b) Colour changes
(c) Metal is deposited
(d) None of these
Answer: (a) Gas bubbles form

Q26. Which of the following is a poor conductor of electricity?
(a) Tap water
(b) Sugar solution
(c) Vinegar
(d) Lemon juice
Answer: (b) Sugar solution

Q27. The process of electrolysis is used in:
(a) Electroplating
(b) Electrorefining of metals
(c) Extraction of metals
(d) All of these
Answer: (d) All of these

Q28. Which of the following is not electroplated for decoration?
(a) Gold
(b) Silver
(c) Iron
(d) Chromium
Answer: (c) Iron

Q29. The liquid that conducts electricity due to the presence of ions is called:
(a) Solvent
(b) Electrolyte
(c) Solution
(d) Compound
Answer: (b) Electrolyte

Q30. Which of these statements about electroplating is true?
(a) It protects the metal from corrosion
(b) It makes the surface shiny
(c) It improves durability
(d) All of the above
Answer: (d) All of the above