Semiconductor Devices: NEET Physics Previous Year Questions

467 previous year questions from Semiconductor Devices. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $In a CE amplifier, the input ac signal to be amplified is applied across$
2. $Match List-I with List-II (matching question)$
3. $The input resistance of a silicon transistor is 100Ω . Base current is changed by 40 μA which results in a change in collector current by 2 mA \dots$
4. $Mobility of electrons in a semiconductor is defined as the ratio drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons i\dots$
5. $The conductivity of semiconductor increases with increase in temperature because$
6. $The input characteristics of a transistor in CE mode is the graph obtained by plotting$
7. $The barrier potential of a p‐n junction depends on [2014] (i) Type of semiconductor material (ii) Amount of doping (iii) Temperature Which one of the following is correct\dots$
8. $A working transistor with its three legs marked P, Q and R is tested using a mustimeter. No conduction is found between P and Q. By connecting the common (negative) termi\dots$
9. $An LED is constructed from a p - n junction diode using GaAsP. The energy gap is 1.9 eV. The wavelength of the light emitted will be equal to [NEET 2019]$
10. $If A = 1 and B = 0, then in terms of Boolean algebra, A + B is equal to$
11. $For a p-type semiconductor, which of the following statements is true?$
12. $By increasing the temperature, the specific resistance of a conductor and semiconductor:$
13. $Which logic gate produces 'LOW' output when any of the inputs is 'HIGH'?$
14. $For a common emitter configuration, if ' α' and ' β' have their usual meanings, the incorrect relation between ' α' and ' β'$
15. $The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be [2008]$
16. $In a junction transistor, the collector current changes by 6.8 mA, if the emitter current is changed by 7 mA . For such transistor, the current amplifica\dots$
17. $A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of :$
18. $Pick out the statement which is not correct.$
19. $The intrinsic semiconductor becomes an insulator at$
20. $In an oscillator, for sustained oscillations, Barkhausen criterion is Aβ equal to (A = voltage gain without feedback, β = feedback factor)$
21. $An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9 eV . Then the wavelength of the emitted lig\dots$
22. $Consider a situation in which reverse biased current of a particular P-N junction increases when it is exposed to a light of wavelength \leq 621 nm . During this p\dots$
23. $If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be [2003]$
24. $In forward biasing of the p-n junction :$
25. $Barrier potential of a p‐n junction diode does not depend on [2003]$

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Semiconductor Devices: NEET Physics Previous Year Questions

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