Question

Match List - I with List - II.

List - I	List - II
A. Tunnel diode B. PIN diode C. Zener diode D. Photodiode	I. Reading of film Sound Track II. High frequency oscillator circuits III. Very high frequency switching circuits IV. Reference voltage

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

Hint:

Important device applications:
• Tunnel diode \(\rightarrow\) HF oscillators
• PIN diode \(\rightarrow\) RF switching
• Zener diode \(\rightarrow\) Voltage reference
• Photodiode \(\rightarrow\) Light detection

Answer 1

The Correct Option is D

Concept: Different semiconductor devices are designed for specific applications depending on:
• switching speed,
• breakdown property,
• optical response,
• negative resistance property.

Step 1: Matching Tunnel diode. Tunnel diode possesses: \[ \text{Negative resistance characteristic} \] Hence it is widely used in: \[ \text{High frequency oscillator circuits} \] Therefore: \[ A \rightarrow II \]

Step 2: Matching PIN diode. PIN diode is widely used in: \[ \text{Very high frequency switching circuits} \] because of:
• low capacitance,
• fast switching response. Thus: \[ B \rightarrow III \]

Step 3: Matching Zener diode. Zener diode maintains nearly constant voltage. Hence it is used as: \[ \text{Reference voltage source} \] Thus: \[ C \rightarrow IV \]

Step 4: Matching Photodiode. Photodiodes are used for detecting light signals such as: \[ \text{film sound track reading} \] Hence: \[ D \rightarrow I \]

Step 5: Writing final matching sequence. Thus: \[ A-II,\;B-III,\;C-IV,\;D-I \] Hence the correct answer is: \[ \boxed{(4)} \]