MCQ Science Curiosity Chapter 4 Class 8 CBSE Board

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Electricity: Magnetic and Heating Effects

1. If the north pole of a compass is attracted to end A of an electromagnet, what is end A?

Question 1 of 20

2. What happens to the magnetic field strength when more cells are used in an electromagnet circuit?

Question 2 of 20

3. How does increasing the number of turns in a coil affect an electromagnet?

Question 3 of 20

4. What happens to the poles of an electromagnet when the current direction is reversed?

Question 4 of 20

5. Why does the Earth behave like a giant magnet?

Question 5 of 20

6. What is a practical application of lifting electromagnets?

Question 6 of 20

7. Why does a nichrome wire become warm when current flows through it?

Question 7 of 20

8. What type of wire is used in Activity 4.5 to observe the heating effect?

Question 8 of 20

9. Why should the nichrome wire not be touched for an extended period in Activity 4.5?

Question 9 of 20

10. What happens to the heat generated in a nichrome wire when using two cells instead of one?

Question 10 of 20

11. What factor does NOT affect the heat generated in a wire?

Question 11 of 20

12. Which household appliance works on the heating effect of electric current?

Question 12 of 20

13. Why can overheating in household circuits be problematic?

Question 13 of 20

14. What is an industrial application of the heating effect of electric current?

Question 14 of 20

15. What is the liquid in a Voltaic cell called?

Question 15 of 20

16. What are the metal plates in a Voltaic cell called?

Question 16 of 20

17. Why does a Voltaic cell stop working over time?

Question 17 of 20

18. Who is credited with inventing the first battery?

Question 18 of 20

19. What materials are used as electrodes in the lemon cell activity?

Question 19 of 20

20. What serves as the electrolyte in the lemon cell?

Question 20 of 20


 

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