Chemical Effects of Electric Current MCQs
Chemical Effects of Electric Current – MCQs with Answers & Explanations
Class: 8 |
Subject: Science
Section: 14 – Chemical Effects of Electric Current
Topic: Chemical Effects of Electric Current
Board: CBSE Board Examination (Based on NCERT Syllabus)
Section: 14 – Chemical Effects of Electric Current
Topic: Chemical Effects of Electric Current
Board: CBSE Board Examination (Based on NCERT Syllabus)
1. The passage of electric current through a conducting liquid causes:
Answer: C — Chemical effect
Electric current can cause chemical reactions in liquids, leading to deposition of substances or gas formation.
Electric current can cause chemical reactions in liquids, leading to deposition of substances or gas formation.
2. Liquids that conduct electricity are called:
Answer: B — Electrolytes
Electrolytes allow electric current to pass due to presence of ions.
Electrolytes allow electric current to pass due to presence of ions.
3. Distilled water is:
Answer: B
Pure distilled water lacks ions, so it conducts poorly.
Pure distilled water lacks ions, so it conducts poorly.
4. Adding salt to water makes it:
Answer: B
Salt dissociates into ions, enabling conduction.
Salt dissociates into ions, enabling conduction.
5. Device used to test conductivity of liquids:
Answer: A
A tester circuit with bulb/LED shows current flow.
A tester circuit with bulb/LED shows current flow.
6. Bubbles at electrodes indicate:
Answer: B
Gas evolution confirms chemical effects.
Gas evolution confirms chemical effects.
7. Deposition of metal on an electrode is called:
Answer: B — Electroplating
Used to coat objects with thin metal layers.
Used to coat objects with thin metal layers.
8. Electroplating prevents:
Answer: B
Coating protects base metal from rusting.
Coating protects base metal from rusting.
9. Good conducting liquid example:
Answer: A
10. Electrodes are usually made of:
Answer: B
11. LED glows dim in liquids because:
Answer: B
12. Copper plating uses solution of:
Answer: A
13. Object to be plated is connected to:
Answer: B
14. Source of current in tester:
Answer: A
15. Heating effect in liquids is:
Answer: B
16. Electroplating improves:
Answer: D
17. Chromed taps are example of:
Answer: B
18. Chemical effect confirms:
Answer: A
19. Gas bubbles form at:
Answer: A
20. Liquid conduction depends on:
Answer: A
