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

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

For a \(\mathrm{p}\text{-}\)type semiconductor, which of the following statements is true?

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

A p-n photodiode is made of a material with a bandgap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly:

1. $10\times {10}^{14}$ $\mathrm{Hz}$

2. $5\times {10}^{14}$ $\mathrm{Hz}$

3. $1\times {10}^{14}$ $\mathrm{Hz}$

4. $20\times {10}^{14}$ $\mathrm{Hz}$

The symbolic representation of four logic gates is as shown:

(i)		(ii)
(ii)		(iv)

The logic symbols for OR, NOT, and NAND gates are respectively:
1. (iii), (iv), (ii)
2. (iv), (i), (iii)
3. (iv), (ii), (i)
4. (i), (iii), (iv)