Semiconductors & Communication · JEE Main previous year questions

2025 6 questions

1. Q322025 · 8 Apr 2025 · Shift 2
   
   1. A.$0\mathrm{V}$
   2. B.$+5\mathrm{V}$
   3. C.$-5\mathrm{V}$
   4. D.$10\mathrm{V}$
   Show answer

   Answer: A

2. Q412025 · 4 Apr 2025 · Shift 1

   The Boolean expression $Y=A\bar{B}C+\bar{A}\bar{C}$ can be realised with which of the following gate configurations. A. One 3-input AND gate, 3 NOT gates and one 2-input OR gate, one 2-input AND gate B. One 3 -input AND gate, 1 NOT gate, One 2 -input NOR gate and one 2 -input OR gate C. 3 -input OR gate, 3 NOT gates and one 2 -input AND gate Choose the correct answer from the options given below:

   1. A.B, C Only
   2. B.A, B, C Only
   3. C.A, B Only
   4. D.A, C Only
   Show answer

   Answer: C

3. Q442025 · 4 Apr 2025 · Shift 2

   Consider a n-type semiconductor in which ${\mathrm{n}}_{\mathrm{e}}$ and ${\mathrm{n}}_{\mathrm{h}}$ are number of electrons and holes, respectively. (A) Holes are minority carriers (B) The dopant is a pentavalent atom (C) ${\mathrm{n}}_{\mathrm{e}}{\mathrm{n}}_{\mathrm{h}}\ne {\mathrm{n}}_i^2$ (where ${\mathrm{n}}_i$ is number of electrons or holes in semiconductor when it is intrinsic form) (D) ${\mathrm{n}}_{\mathrm{e}}{\mathrm{n}}_{\mathrm{h}}⩾{\mathrm{n}}_i^2$ (E) The holes are not generated due to the donors Choose the correct answer from the options given below :

   1. A.(A), (B), (E) only
   2. B.(A), (C), (E) only
   3. C.(A), (B), (C) only
   4. D.(A), (C), (D) only
   Show answer

   Answer: A

4. Q482025 · 2 Apr 2025 · Shift 1· Numerical answer

   A vessel with square cross-section and height of $6\text{ m}$ is vertically partitioned. A small window of $100{\text{ cm}}^2$ with hinged door is fitted at a depth of $3\text{ m}$ in the partition wall. One part of the vessel is filled completely with water and the other side is filled with the liquid having density $1.5\times 10^3{\text{ kg/m}}^3$. What force one needs to apply on the hinged door so that it does not get opened ? (Acceleration due to gravity $=10{\text{ m/s}}^2$ )

   Show answer

   Answer: 150

5. Q372025 · 24 Jan 2025 · Shift 1

   Consider the following statements : A. The junction area of solar cell is made very narrow compared to a photo diode. B. Solar cells are not connected with any external bias. C. LED is made of lightly doped p-n junction. D. Increase of forward current results in continuous increase of LED light intensity. E. LEDs have to be connected in forward bias for emission of light. Choose the correct answer from the options given below :

   1. A.A, C, E Only
   2. B.B, E Only
   3. C.A, C Only
   4. D.B, D, E Only
   Show answer

   Answer: B

6. Q352025 · 22 Jan 2025 · Shift 1
   
   1. A.(C) and (E) only
   2. B.(A) and (D) only
   3. C.(B), (D) and (E) only
   4. D.(B), (C) and (E) only
   Show answer

   Answer: D