Question

Match List-I with List-II.

List-I	List-II
A. BJT B. MOSFET C. Tunnel diode D. Zener diode	I. Voltage controlled negative resistance II. High current gain III. Voltage regulation IV. High input impedance

• A. A-I, B-IV, C-II, D-III
• B. A-II, B-IV, C-I, D-III
• C. A-II, B-III, C-I, D-IV
• D. A-IV, B-II, C-I, D-III

Hint:

Important semiconductor device characteristics: \[ \text{BJT} \rightarrow \text{High Current Gain} \] \[ \text{MOSFET} \rightarrow \text{High Input Impedance} \] \[ \text{Tunnel Diode} \rightarrow \text{Negative Resistance} \] \[ \text{Zener Diode} \rightarrow \text{Voltage Regulation} \]

Answer 1

The Correct Option is B

Concept: Different semiconductor devices are characterized by their unique electrical properties and applications.
• BJT provides high current gain.
• MOSFET offers extremely high input impedance.
• Tunnel diode exhibits negative resistance.
• Zener diode is widely used for voltage regulation. These characteristics are fundamental and frequently asked in electronics examinations.

Step 1: Match BJT. BJT stands for Bipolar Junction Transistor. A BJT operates as a current-controlled current amplifier. Its current gain is: \[ \beta=\frac{I_C}{I_B} \] BJTs are known for: \[ \text{High current gain} \] Thus: \[ A \rightarrow II \]

Step 2: Match MOSFET. MOSFET has an insulated gate structure. Because the gate is insulated by \(SiO_2\):
• Gate current is almost zero.
• Input resistance becomes extremely high. Therefore: \[ \text{MOSFET} \rightarrow \text{High input impedance} \] Hence: \[ B \rightarrow IV \]

Step 3: Match Tunnel Diode. Tunnel diode exhibits a special region where: \[ \frac{dI}{dV}<0 \] This is called: \[ \text{Negative resistance region} \] Thus: \[ \text{Tunnel diode} \rightarrow \text{Voltage controlled negative resistance} \] Hence: \[ C \rightarrow I \]

Step 4: Match Zener Diode. Zener diodes are operated in reverse breakdown region. Their main application is: \[ \text{Voltage regulation} \] Thus: \[ D \rightarrow III \]

Step 5: Write the final matching sequence. Therefore: \[ A-II,\ B-IV,\ C-I,\ D-III \] Hence, the correct option is: \[ \boxed{(B)\ A-II,\ B-IV,\ C-I,\ D-III} \]