29. In semiconductors, at room temperature ___ ?

28. The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without filter is10 V. The d.c component of the output voltage is ?

27. In a p − n junction photocell, the value of the photo-electromotive force produced by monochromatic light is proportional to ?

26. If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be ?

25. Barrier potential of a p − n junction diode does not depend on ___ ?

24. Reverse bias applied to a junction diode ___ ?

23. A d.c. battery of V volt is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be ?

23. A d.c. battery of V volt is connected to a series combination of a resistor R and an ideal diode D as shown in the figure below. The potential difference across R will be ?

22. In a p − n junction ___ ?

21. The intrinsic semiconductor becomes an insulator at ___ ?

20. An alternating current can be converted into direct current by a ____ ?

19. In forward bias, the width of potential barrier in a p − n junction diode _____ ?

18. A depletion layer consists of ?

17. Which of the following when added acts as an impurity into silicon produced n-type semiconductor ?

16. In a junction diode, the holes are due to ?

15. A semi-conducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be ?

14. The cause of the potential barrier in a p − n diode is ?

13. To obtain a p-type germanium semiconductor, it must be doped with ?

12. When arsenic is added as an impurity to silicon, the resulting material is ?

11. Which of the following, when added as an impurity, into the silicon, produces n-type semiconductor ?

10. When a p − n junction diode is reverse biased the flow of current across the junction is mainly due to ?