To get output \(Y = 1\) in the given circuit which of the following input will be correct?

 

	\(A\)	\(B\)	\(C\)
1.	1	0	1
2.	1	1	0
3.	0	1	0
4.	1	0	0

A Zener diode, having a breakdown voltage equal to 15 V, is used in a voltage regulator circuit as shown in the figure. The current through the diode is:

1. 5 mA
2. 10 mA
3. 15 mA
4. 20 mA

In the following figure, the diodes which are forward biased are:
 

(a)
(b)
(c)
(d)

1. (a), (b) and (d)
2. (c) only
3. (a) and (c)
4. (b) and (d)

Pure Si at \(500~\text{K}\) has an equal number of electron \((n_e)\) and hole\((n_h)\) concentrations of \(1.5\times10^{16}~\text{m}^{-3}\). Doping by indium increases \(n_h\) to \(4.5\times10^{22}~\text{m}^{-3}\).  The doped semiconductor is of:

The following figure shows a logic gate circuit with two inputs A and B, and the output Y. The voltage waveforms of A, B and Y are as given.
 

The logic gate is:

1. OR gate

2. AND gate

3. NAND gate

4. NOR gate

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

Which of the following is an example of forward biasing?
 

1.		2.
3.		4.

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