Semiconductor Electronics Previous Year Questions — NEET Physics

3 past-year Semiconductor Electronics questions from NEET (Physics).

Q2823 (2024)

The current I in the circuit shown below is : (All diodes are ideal and identical) {{IMG1}}
  1. $\frac{5}{3}\mathrm{A}$
  2. $\frac{15}{2}\mathrm{A}$
  3. $\frac{1}{3}\mathrm{A}$
  4. $\frac{5}{9}\mathrm{A}$
### Related Formula $$I = \frac{V}{R_{\text{eq}}}$$ ### Core Logic For ideal diodes: forward biased resistance = 0, reverse biased resistance = $\infty$. Branches 1 and 3 are forward biased (diodes conduct). Branches 2 and 4 are reverse biased (diodes open). {{SOL_IMG1}} $$I = \frac{10}{2} + \frac{10}{4} = 5 + 2.5 = \frac{15}{2} \mathrm{A}$$ ### Pattern Recognition Identify forward vs reverse biased diodes to reduce the circuit to active parallel resistive branches. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics

Q24 (2024)

In the circuit shown below, the voltage appearing across the diode D will be of the form: {{IMG1}}
  1. Option (1)
  2. Option (2)
  3. Option (3)
  4. Option (4)
### Related Formula $v_D = v_i - v_R$ ### Core Logic During the positive half cycle, diode is reverse biased, acting as an open circuit. Full voltage drops across diode $D$. During the negative half cycle, diode is forward biased, acting as a short circuit (ideal). Voltage drop across diode is zero. {{SOL_IMG1}} {{SOL_IMG2}} {{SOL_IMG3}} This matches waveform in option (2). ### Pattern Recognition Reverse biased diode blocks current and drops full input voltage across itself. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics

Q44 (2024)

Two statements are given below: A. When the forward bias voltage across a p-n junction diode increases above a certain threshold voltage, the diode current increases significantly. B. This current is called reverse saturation current. Choose the correct answer from the options given below:
  1. Both Statements A and B are false
  2. Statement A is true, but Statement B is false
  3. Both Statements A and B are true
  4. Statement A is false, but Statement B is true
### Related Formula $$I = I_s \left(e^{eV/k_B T} - 1\right)$$ ### Core Logic Statement A is true: across the knee/threshold voltage, forward current increases exponentially. {{SOL_IMG1}} Statement B is false: reverse saturation current occurs in reverse bias condition, not forward bias. ### Pattern Recognition Forward bias current vs reverse saturation current definitions. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics
Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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