In the following circuit, the output \(Y\) for all possible inputs \(A\) and \(B\) is expressed by the truth table: 
    

1.	A	B	Y	2.	A	B	Y
	0	0	0		0	0	1
	0	1	0		0	1	1
	1	0	0		1	0	1
	1	1	1		1	1	0
3.	0	0	1	4.	0	0	0
	0	1	0		0	1	1
	1	0	0		1	0	1
	1	1	1		1	1	1

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an: 

1. p-type semiconductor

2. insulator

3. metal

4. n-type semiconductor

A transistor is operated in a common emitter configuration at constant collector voltage V_c = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:

1. 67

2. 75

3. 100

4. 50

Which of the following is an example of forward biasing?
 

1.		2.
3.		4.

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C are as shown below:
   
The logic circuit gate is:

1. AND gate

2. NAND gate

3. NOR gate

4. OR gate

The correct Boolean operation represented by the circuit diagram given above is:
 
1. \(\mathrm{NOR}\)
2. \(\mathrm{AND}\)
3. \(\mathrm{OR}\)
4. \(\mathrm{NAND}\)

The circuit is equivalent to: 
     

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

To get an output Y = 1 from the circuit shown below, the input must be:

1. A=0 B=1 C=0

2. A=0 B=0 C=1

3. A=1 B=0 C=1

4. A=1 B=0 C=0

A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is:

1. 500

2. 1000

3. 1250

4. 50