12th Class Physics Quiz Ranking Challenge

1. The core of transformer is laminated to reduce

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

3. When light is refracted into a medium,

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

5. 12 signals each band limited to 5 kHz are to be transmitted by frequency-division multiplexer. If AM-SSB modulation guard band of 1 kHz is used then the bandwidth of multiplexed signal is

6. Sensitivity of potentiometer can be increased by

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

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

9. Television signals are

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

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

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

13. Debye is the unit of

14. A transformer is based on the principle of

15. Hysterisis is the phenomenon of lagging of

16. The cause of the potential barrier in a p-n junction diode is

17. In PCM if the transmission path is very long

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

19. Photons are deflected by

20. 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