Chemical Effects of Electric Current

Grade 8 Science — Chemical Effects of Electric Current: 25 practice questions with instant scoring and explanations.

1. Which of the following is a good conductor of electric current?
2. What happens when electric current flows through an insulator?
3. The process of coating a metal with another metal using electricity is called:
4. In electrolysis, the electrode connected to the positive terminal of the battery is:
5. Which setup can test if a solution conducts electricity?
6. When an LED lights up in a conductivity test, it indicates:
7. Electroplating is used to:
8. Which of these solutions conducts electricity?
9. The decomposition of a compound using electricity is:
10. In electroplating copper on iron, iron acts as:
11. Electrolysis of water produces:
12. Which material is used as electrodes in the LED conductivity test?
13. What is the role of a salt bridge in electrolysis?
14. Metallic objects get corroded due to:
15. Which application of electroplating is most common?
16. When electric current passes through copper sulphate solution with copper electrodes:
17. Insulators have electrons that are:
18. The apparatus used for electrolysis typically includes:
19. Which of these is a non-metallic conductor?
20. In electroplating, the object to be plated is connected to the:
21. When conducting a conductivity test, a brighter LED indicates:
22. Electroplating of tin on steel is done to:
23. The process where copper is purified using electricity is:
24. Which ion in a solution carries the electric current towards the cathode?
25. For the LED test to work, the solution must: