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
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
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 |
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.
2.
3.
4.
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)
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
Which one of the following statements is false?
1. | Pure Si doped with trivalent impurities gives a p-type semiconductor. |
2. | The majority of carriers in an n-type semiconductor are holes. |
3. | The minority carriers in a p-type semiconductor are electrons. |
4. | The resistance of intrinsic semiconductors decreases with an increase in temperature. |