A Zener diode is used to obtain a constant voltage. If the applied voltage \(V\) changes, then:
(\( V\) is more than Zener voltage)
               

1.	\(i_{1}\) and \(i_{2}\) change.
2.	\(i_{2}\) and \( V_{0}\) change and \(i_{3}\) remain constant.
3.	\(i_{2}\) and \(V_{0}\) don't change while \(i_{3}\) changes.
4.	\(i_{3}\) and \( V_{0}\) don't change while \(i_{2}\) changes.

Which one of the following represents an analog circuit diagram for OR gate?

1.		2.
3.		4.

Which of the following-junction is used unbiased?

1. Photo diode

2. LED

3. Zener diode

4. Solar cell

 
1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)

The \((I\text-V)\) characteristics of a \(\mathrm{p\text-n}\) junction diode is as shown. If \(R_1\) and \(R_2\) be the dynamic resistance of the \(\mathrm{p\text-n}\) junction when (i) a forward bias of \(1\) volt is applied and (ii) a forward bias of \(2\) volts is applied respectively, then \(\frac{R_1}{R_2}=?\)

1. \(160\)
2. \(16\)
3. \(1.6\)
4. \(0.16\)

Current \(I_1\) through the Zener diode shown in the circuit is:
      
1. Zero
2. \(0.6\) mA
3. \(0.2\) mA
4. \(0.8\) mA

The LED:

Logic gates \(X\) and \(Y\) have the truth tables shown below:

When the output of \(X\) is connected to the input of \(Y\), the resulting combination is equivalent to a single:
1. NOT gate
2. OR gate
3. NAND gate
4. AND gate