12th Class Physics Quiz Ranking Challenge

1. The magnetic compass is not useful for navigation near the magnetic poles, since

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

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

4. Debye is the unit of

5. Coulomb’s law is true for

6. Photoelectric effect can be explained by

7. The electric field inside a spherical shell of uniform surface charge density is

8. Sensitivity of potentiometer can be increased by

9. Photons are deflected by

10. Which of the following is not due to total internal reflection?

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

12. Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging

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

14. A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

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

16. The photoelectric current does not depend upon the
(i) frequency of incident light
(ii) work function of the metal
(iii) stopping potential
(iv) intensity of incident light

17. The core of transformer is laminated to reduce

18. A point charge is kept at the centre of metallic insulated spherical shell. Then

19. Wave obtained on superimposition of audible frequency e.m. wave is known as

20. Of the following about capacitive reactance which is correct?