What is the name of the logic gate represented by the following symbol?
              

1. NOR
2. OR
3. NAND
4. AND

The combination of gates shown in the diagram is equivalent to:
              

1. OR
2. AND
3. NAND
4. NOT

For the logic circuit given below, the output \(Y\) for \(A=0,B=0\) and \(A=1,B=1\) are:

          
1. \(0\) and \(1\)
2. \(0\) and \(0\)
3. \(1\) and \(0\)
4. \(1\) and \(1\)

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

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