Semiconductors & Communication · JEE Main previous year questions

2026 9 questions

1. Q452026 · 5 Apr 2026 · Shift 2

   In a semiconductor p-n diode, the doping concentrations on p-side and n-side are $10^{15}atoms/c{\mathrm{m}}^3$ and $10^{18}atoms/c{\mathrm{m}}^3$, respectively. Which one of the following statements is true ?

   1. A.Widths of depletion region on either side of the interface are equal
   2. B.The depletion region width is more on p-side compared to that in n-side
   3. C.The depletion region width is more on n-side compared to that in p-side
   4. D.No depletion region forms because of unequal doping concentrations on p and n-sides
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   Answer: B

2. Q452026 · 4 Apr 2026 · Shift 2

   Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: A diode under reverse-biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically. Reason R: Below the critical voltage limit, only majority charge carriers flow which increases drastically above critical voltage. choose the correct answer from the options given below

   1. A.Both A and R are true and R is the correct explanation of A
   2. B.Both A and R are true but R is NOT the correct explanation of A
   3. C.A is true but R is false
   4. D.A is false but R is true
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   Answer: C

3. Q462026 · 4 Apr 2026 · Shift 2· Numerical answer

   A diode has Zener voltage of $10\mathrm{V}$ and maximum power dissipation of $0.5\mathrm{W}$, then the minimum resistance to be used in series with this diode for safety when it is connected to a $25\mathrm{V}$ power supply is ____ $\Omega$.

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   Answer: 300

4. Q372026 · 2 Apr 2026 · Shift 1
   
   1. A.Resistor in series with diode pointing towards Y
   2. B.Diode pointing towards X in series with Zener diode pointing towards Y
   3. C.Resistor in series with diode pointing towards X
   4. D.Diode pointing towards X in series with Zener diode pointing towards X
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   Answer: B

5. Q282026 · 28 Jan 2026 · Shift 1
   
   1. A.17.6
   2. B.18.8
   3. C.20.15
   4. D.11.7
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   Answer: B

6. Q342026 · 28 Jan 2026 · Shift 2
   
   1. A.AND Gate
   2. B.OR Gate
   3. C.NOR Gate
   4. D.NAND Gate
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   Answer: A

7. Q292026 · 23 Jan 2026 · Shift 1
   
   1. A.100
   2. B.10
   3. C.1000
   4. D.4000
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   Answer: C

8. Q422026 · 23 Jan 2026 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A

9. Q382026 · 22 Jan 2026 · Shift 1
   
   1. A.1000
   2. B.0011
   3. C.0100
   4. D.1101
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   Answer: D