Electromagnetism – Online MCQs – Physics 10th

1. Electric motors work on the principle of:

2. When a current passes through a conductor, it produces:

3. When electric charges are at rest, they exert:

4. If we increase the number of loops, the turning effect of a coil would be:

5. A D.C motor converts:

6. At the generating station, the AC voltage is:

7. A magnetic compass shows deflection if it is kept near a:

8. Transformers are used to:

9. We apply Lenz’s law to find out the direction of:

10. In a transformer, the primary coil is connected to:

11. To increase or decrease AC voltages, we use:

12. The number of coils in a transformer is:

13. The direction of induced current in a circuit is always such that it opposes the cause that produces it. This law was presented by:

14. 1 Tesla = _________________

15. The direction of induced e.m.f. in a circuit is in accordance with the conservation of:

16. The electric power delivered to the secondary circuit is equal to the power supplied to the primary circuit is a/an:

17. The production of induced current in one coil due to the current in the neighbouring coil is called:

18. Which statement is true about the magnetic poles?

19. It is responsible for forcing positively charged atomic nuclei to attract negatively charged electrons.

20. The induced emf of a coil is directly proportional to: