In the given circuit, the power developed in \(2~\text{k}\Omega\) resistor is:

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

An $n-p-n$ transistor having A.C. current gain of 50 is to be used to make an amplifier of voltage gain 6. What will be the power gain in the amplifier?

1. 300

2. 600

3. 750

4. 400

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

In an NPN transistor, 10⁸ electrons enter the emitter in ${10}^{-8}$s. If 1% electrons are lost in the base, the fraction of current that enters the collector and the current amplification factor are, respectively:

1. 0.7 and 50

2. 0.9 and 90

3. 0.8 and 49

4. 0.99 and 99

When a transistor is used in a common emitter mode as an amplifier:

The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.

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

The output in the circuit shown in the figure taken across a capacitor is:

1.		2.
3.		4.