Semiconductors Previous Year Questions — JEE Main Physics

32 past-year Semiconductors questions from JEE Main (Physics) — page 6.

Q35 (2026)

The correct truth table for the given input data of the following logic gate is : {{IMG1}}
  1. <div style="overflow-x: auto; margin: 0.5rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;" colspan="4">Inputs</th><th style="border: 1px solid #888; padding: 4px;">Output</th></tr><tr><th style="border: 1px solid #888; padding: 4px;">A</th><th style="border: 1px solid #888; padding: 4px;">B</th><th style="border: 1px solid #888; padding: 4px;">C</th><th style="border: 1px solid #888; padding: 4px;">D</th><th style="border: 1px solid #888; padding: 4px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr></tbody></table></div>
  2. <div style="overflow-x: auto; margin: 0.5rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;" colspan="4">Inputs</th><th style="border: 1px solid #888; padding: 4px;">Output</th></tr><tr><th style="border: 1px solid #888; padding: 4px;">A</th><th style="border: 1px solid #888; padding: 4px;">B</th><th style="border: 1px solid #888; padding: 4px;">C</th><th style="border: 1px solid #888; padding: 4px;">D</th><th style="border: 1px solid #888; padding: 4px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr></tbody></table></div>
  3. <div style="overflow-x: auto; margin: 0.5rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;" colspan="4">Inputs</th><th style="border: 1px solid #888; padding: 4px;">Output</th></tr><tr><th style="border: 1px solid #888; padding: 4px;">A</th><th style="border: 1px solid #888; padding: 4px;">B</th><th style="border: 1px solid #888; padding: 4px;">C</th><th style="border: 1px solid #888; padding: 4px;">D</th><th style="border: 1px solid #888; padding: 4px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr></tbody></table></div>
  4. <div style="overflow-x: auto; margin: 0.5rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;" colspan="4">Inputs</th><th style="border: 1px solid #888; padding: 4px;">Output</th></tr><tr><th style="border: 1px solid #888; padding: 4px;">A</th><th style="border: 1px solid #888; padding: 4px;">B</th><th style="border: 1px solid #888; padding: 4px;">C</th><th style="border: 1px solid #888; padding: 4px;">D</th><th style="border: 1px solid #888; padding: 4px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr></tbody></table></div>
### Related Formula $$Y = \overline{(\overline{A \cdot B}) \cdot (C + D)}$$ Applying De Morgan's Law: $$Y = (A \cdot B) + (\overline{C + D})$$ ### Core Logic Analyzing the expression step by step: 1. Upper branch: $A$ and $B$ pass through NAND gate $\rightarrow \overline{A \cdot B}$. 2. Lower branch: $C$ and $D$ pass through OR gate $\rightarrow (C + D)$. 3. Combined in AND gate followed by NOT gate (NAND equivalent output stage): $$Y = \overline{(\overline{A \cdot B}) \cdot (C + D)} = (A \cdot B) + (\overline{C + D})$$ Testing conditions for Option (2): - For $A=1, B=1, C=0, D=1 \implies (1 \cdot 1) + (\overline{0 + 1}) = 1 + 0 = 1$. - For $A=0, B=0, C=1, D=1 \implies (0 \cdot 0) + (\overline{1 + 1}) = 0 + 0 = 0$. - For $A=1, B=0, C=1, D=0 \implies (1 \cdot 0) + (\overline{1 + 0}) = 0 + 0 = 0$. - For $A=1, B=1, C=1, D=1 \implies (1 \cdot 1) + (\overline{1 + 1}) = 1 + 0 = 1$. {{SOL_IMG1}} ### Step 1: Final Conclusion Option (2) presents the correct truth table matching the evaluated output values. ### Pattern Recognition Boolean reduction: $\overline{\bar{X} \cdot Y} = X + \bar{Y}$ where $X = A \cdot B$ and $Y = C+D$. Hence $Y = (A \cdot B) + (\overline{C+D})$. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics

Q37 (2026)

The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at $V_{Z} = 5V$ and the desired current in load is 5 mA. The unregulated voltage source can supply up to 25V. Considering the Zener diode can withstand four times of the load current, the value of resistor $R_{S}$ (shown in circuit) should be ____ $\Omega$. {{IMG1}}
  1. $4000$
  2. $10$
  3. $100$
  4. $1000$
### Related Formula $$I_{\text{total}} = I_{Z} + I_{L}$$ $$V_{\text{in}} - V_{Z} = I_{\text{total}} R_{S}$$ ### Core Logic The question is dropped by the examination authority, meaning there was an anomaly in data or multiple correct interpretations, likely due to imprecise wording regarding the maximum source voltage and the exact safe current rating. In a nominal calculation, $I_{Z_{\text{max}}} = 4 \times 5 \text{ mA} = 20 \text{ mA}$. Total current $I = 25 \text{ mA}$. $R_{S} = (25 - 5) / (25 \times 10^{-3}) = 800\Omega$, which is not in the options. ### Step 1: Final Conclusion Question Dropped. ### Pattern Recognition Sees: "Question Dropped" → This often occurs when mathematical data maps to none of the provided MCQs. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics: Materials, Devices and Simple Circuits

Q38 (2026)

For the given logic gate circuit, which of the following is the correct truth table? {{IMG1}}
  1. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;">n</th><th style="border: 1px solid #888; padding: 4px;">m</th><th style="border: 1px solid #888; padding: 4px;">z</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr></tbody></table></div>
  2. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;">n</th><th style="border: 1px solid #888; padding: 4px;">m</th><th style="border: 1px solid #888; padding: 4px;">z</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr></tbody></table></div>
  3. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;">n</th><th style="border: 1px solid #888; padding: 4px;">m</th><th style="border: 1px solid #888; padding: 4px;">z</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr></tbody></table></div>
  4. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 4px;">n</th><th style="border: 1px solid #888; padding: 4px;">m</th><th style="border: 1px solid #888; padding: 4px;">z</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 4px;">1</td><td style="border: 1px solid #888; padding: 4px;">0</td><td style="border: 1px solid #888; padding: 4px;">0</td></tr></tbody></table></div>
### Related Formula Boolean Algebra rules: $A + AB = A$ $A \cdot A = A$ NAND Gate: $Z = \overline{X \cdot Y}$ ### Core Logic Gate 1 (Bottom): This is an OR gate with inputs $n$ and $m$. Output = $n + m$ Gate 2 (Top): This is a NAND gate. Its inputs are direct $n$ and the output of the OR gate ($n + m$). Output $z = \overline{n \cdot (n + m)}$ ### Step 1: Simplify the Boolean Expression First, expand the inner term: $$n \cdot (n + m) = (n \cdot n) + (n \cdot m)$$ Since $n \cdot n = n$, this becomes: $$n + n \cdot m = n(1 + m) = n \cdot 1 = n$$ So the overall output is: $$z = \overline{n \cdot (n + m)} = \overline{n}$$ ### Step 2: Construct the Truth Table Since $z = \overline{n}$, the output $z$ only depends on $n$ and is its exact inverse. When $n=0, m=0 \implies z=1$ When $n=0, m=1 \implies z=1$ When $n=1, m=1 \implies z=0$ When $n=1, m=0 \implies z=0$ ### Pattern Recognition Always simplify the Boolean expression using standard absorption laws (like $A(A+B) = A$) before manually evaluating every row. It saves significant time. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics

Q48 (2026)

A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W, is operated at 15 V. The approximate value of protective resistance in this circuit is ____ $\Omega$.
### Related Formula $P_Z = V_Z I_Z$ $$V_{\text{in}} = I_Z R_S + V_Z$$ ### Core Logic For the Zener diode, the maximum power dissipated is: $$P_D = 0.4 \text{ W}$$ Since $P_D = V_Z I_Z$: $$0.4 = 10 \times I_Z \implies I_Z = 0.04 \text{ A}$$ ### Step 1: Find Protective Series Resistance {{SOL_IMG1}} The voltage drop across the series protective resistance $R$ is: $$V_R = V_{\text{in}} - V_Z = 15 - 10 = 5 \text{ V}$$ Using Ohm's law, $R = \frac{V_R}{I_Z}$: $$R = \frac{5}{0.04} = \frac{500}{4} = 125 \, \Omega$$ ### Pattern Recognition To secure a Zener against burning out, calculate its max safe current via $P_{max} / V_z$. Feed this current into the required voltage drop ($V_{in} - V_z$) to get the exact protective resistance. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Physics: Semiconductor Electronics

Q39 (2026)

Identify the correct truth table of the given logical circuit. {{IMG1}}
  1. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 8px;">A</th><th style="border: 1px solid #888; padding: 8px;">B</th><th style="border: 1px solid #888; padding: 8px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr></tbody></table></div>
  2. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 8px;">A</th><th style="border: 1px solid #888; padding: 8px;">B</th><th style="border: 1px solid #888; padding: 8px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr></tbody></table></div>
  3. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 8px;">A</th><th style="border: 1px solid #888; padding: 8px;">B</th><th style="border: 1px solid #888; padding: 8px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr></tbody></table></div>
  4. <div style="overflow-x: auto; margin: 1rem 0;"><table style="width: 100%; border-collapse: collapse; text-align: center; font-size: 14px;"><thead><tr><th style="border: 1px solid #888; padding: 8px;">A</th><th style="border: 1px solid #888; padding: 8px;">B</th><th style="border: 1px solid #888; padding: 8px;">Y</th></tr></thead><tbody><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td><td style="border: 1px solid #888; padding: 8px;">1</td></tr><tr><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">1</td><td style="border: 1px solid #888; padding: 8px;">0</td></tr></tbody></table></div>
### Related Formula $$\text{De Morgan's Laws: } \overline{A \cdot B} = \overline{A} + \overline{B}$$ ### Core Logic {{SOL_IMG1}} Let's trace the logic line by line. Top branch: A passes through an AND gate with both inputs tied to A, so it remains $A$. Bottom branch: A and B pass through a NAND gate, yielding $\overline{A \cdot B}$. Then it passes through an AND gate with inputs tied together, so it remains $\overline{A \cdot B}$. ### Step 1: Boolean Expression Finally, the inputs $A$ and $\overline{A \cdot B}$ are fed into a final AND gate. $$Y = A \cdot \overline{A \cdot B}$$ Applying De Morgan's Law: $$Y = A \cdot (\overline{A} + \overline{B})$$ $$Y = A \cdot \overline{A} + A \cdot \overline{B}$$ ### Step 2: Simplify Since $A \cdot \overline{A} = 0$, we have: $$Y = 0 + A \overline{B} = A \overline{B}$$ Checking values: If $A=1, B=0$, then $Y = 1 \cdot 1 = 1$. For all other combinations, $Y = 0$. {{SOL_IMG2}} ### Pattern Recognition An AND gate acting on $A$ and $\text{NAND}(A, B)$ inherently acts as a "strictly A and NOT B" checker. The boolean algebra instantly simplifies $A(\overline{AB})$ to $A\overline{B}$. ### 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%)

Select Your Target Exam

Choose an exam track below to find formulas per chapter and patterns.

Syncing Exam Intelligence

Mapping formulas and patterns across all tracks…

PATH A — FULL LENGTH PRACTICE

Full Mock Test Hub

Simulate real NTA exam conditions with fully tracked mocks. Time yourself against past papers.

Now Live Open
PATH B — TARGETED PRACTICE

Topic-wise Practice Hub

Practice past-year questions one chapter at a time. Pick an exam → subject → chapter and get every PYQ for that topic — pulled together from all past papers — with the chapter's key formulas alongside.

Loading Questions... Browse Topics

Exam Analysis Tools

Chapter weightage trends and topic-wise practice — all mapped from past shift papers.

Year-wise PYQ

Chapter Weightage & Trends

See high-yield chapters, year-wise counts and the frequency-based chance each topic repeats next exam.

Weightage Board Open
Targeted PYQs

Topic-wise Practice Hub

Every past-year question for a chapter pulled from all papers, with its key formulas alongside.

One chapter at a time Open
Latest from the Blog
View all →

Loading articles...