Electric Current and Its Effects

Grade 7 Science — Electric Current and Its Effects: 25 practice questions with instant scoring and explanations.

1. What does the symbol ⚪ with an X inside represent in an electric circuit?
2. Electric current is the flow of which particles?
3. In which direction does conventional current flow?
4. What is the heating effect of electric current commonly used for?
5. A fuse is designed to break when:
6. MCB stands for:
7. An electromagnet is formed when:
8. In an electric bell, the electromagnet attracts:
9. What is the SI unit of electric current?
10. If too much current flows through a circuit, a fuse:
11. When an electromagnet is switched off:
12. The element inside a fuse that melts is typically made of:
13. An electric circuit must have a continuous path for current to flow. This path is called:
14. Which of these is an insulator in electrical circuits?
15. The heating effect of current is caused by:
16. An electric bulb glows due to:
17. What is the function of a switch in an electric circuit?
18. Electromagnets are used in door locks because:
19. When current-carrying wires are placed near a compass, the compass needle:
20. A circuit with a break in the wire is called:
21. To increase the strength of an electromagnet, we can:
22. In an electric bell, sound is produced when:
23. Which material is commonly used as the core of an electromagnet?
24. A fuse with a rating of 5A can safely handle:
25. The property of a material that opposes the flow of electric current is called: