12th Class Physics Quiz Ranking Competition

1. In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

2. The magnetic moment of a bar magnet is thus ...A... to the magnetic moment of an equivalent solenoid that produces the same magnetic field. Here, A refers to

3. Phase difference between voltage and current in a capacitor in an ac circuit is

4. Debye is the unit of

5. An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

6. To minimise the power loss in the transmission cables connecting the power stations to homes and factories, the transmission cables carry current

7. Television signals are

8. A capacitor acts as an infinite resistance for

9. When light is refracted into a medium,

10. At magnetic poles, the angle of dip is

11. The mobility of free electrons is greater than that of free holes because

12. Hysterisis is the phenomenon of lagging of

13. When light is refracted, which of the following does not change?

14. Which of the following is drawback of amplitude modulation?

15. Which of the following is correct for the beam which enters the medium?

16. The drift current in a p-n junction is from the

17. Figure shows electric field lines in which an electric dipole P is placed as shown. Which of the following statements is correct?

18. A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It will

19. The lines of force due to earth’s horizontal magnetic field are

20. In an n-type semiconductor, donor valence band is