Introduction
This set contains 50 multiple-choice questions (MCQs) covering the Chemical Effects of Electric Current chapter from the Class 8 Science curriculum (NCERT/JKBOSE/CBSE). The questions are designed to test conceptual understanding, application-based reasoning, and experimental analysis. Topics include conductivity of liquids, electrolytes, electrolysis, electroplating, LED behaviour, and the chemical effects of electric current. Each question is followed by the correct answer with no repetition across the set.
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📘 Science
SCIENCE | Chemical Effects Of electric Current-A
📝 Questions: 50
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Q1. The passage of an electric current through a conducting liquid causes:
Q2. Which of the following liquids is most likely to conduct electricity?
Q3. A material that allows electric current to pass through it is called:
Q4. The device that glows when even a weak electric current flows through it is:
Q5. In an LED, the longer lead (wire) is always connected to the:
Q6. Which of the following is a poor conductor of electricity?
Q7. The process of depositing a layer of one metal on another metal using electricity is called:
Q8. Which of the following is an example of an electroplated object?
Q9. The electrodes used in electroplating are:
Q10. Tap water conducts electricity because it contains:
Q11. In an electric circuit testing the conductivity of a liquid, if the bulb glows, the liquid is:
Q12. Which of the following is NOT a good conductor of electricity?
Q13. The full form of LED is:
Q14. Which electrode is connected to the negative terminal of the battery?
Q15. Electroplating helps in:
Q16. Which of the following liquids is a good conductor of electricity?
Q17. In an LED, the shorter lead is connected to the:
Q18. Which of the following objects is commonly electroplated with chromium?
Q19. The liquid that conducts electricity is called:
Q20. Which of the following does NOT conduct electricity?
Q21. The electrode connected to the positive terminal of the battery is called:
Q22. Electroplating is based on which effect of electric current?
Q23. Which of the following is an example of a poor conductor of electricity?
Q24. The colour of light emitted by a standard red LED is:
Q25. Which metal is commonly used to electroplate iron to prevent rusting?
Q26. A solution that does not allow electricity to pass through is called:
Q27. In an electroplating experiment, the object to be plated is made the:
Q28. Which of the following is an electroplated object commonly found in homes?
Q29. The gas bubbles seen at electrodes when current passes through water containing a little acid are of:
Q30. Which of the following liquids will make a bulb glow brightest?
Q31. An LED is preferred over a bulb in a conductivity tester because:
Q32. The process of decomposition of a liquid by passing electric current is called:
Q33. Which of the following is a good conductor of electricity?
Q34. In an LED, the light is produced because of:
Q35. Which of the following objects is often electroplated with gold?
Q36. To test whether a liquid conducts electricity, the circuit must be:
Q37. Which of the following is NOT an electroplated object?
Q38. The electrolyte used in electroplating copper on an iron object is:
Q39. Pure water is a poor conductor because:
Q40. The anode in electroplating is made of:
Q41. Which of the following statements is true about LEDs?
Q42. A metal that is a very good conductor of electricity is:
Q43. Electroplating is done to:
Q44. When electric current passes through a conducting liquid, the ions move towards:
Q45. Which of the following is a poor conductor of electricity?
Q46. In an electroplating setup, the electrolyte must be:
Q47. The chemical effect of electric current is used in:
Q48. Which of the following is an example of a good conducting liquid?
Q49. The object that is electroplated with tin is:
Q50. If the LED does not glow when dipped in a liquid, the liquid is likely:
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