Q. No.In a good conductor, the energy gap between the conduction band and the valence band is:
1. Infinite
2. Wide
3. Narrow
4. Zero
1. Infinite
2. Wide
3. Narrow
4. Zero
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| 1. | \(10^{17} / \text{m}^3 \) | 2. | \(10^{15} / \text{m}^3 \) |
| 3. | \(10^4 / \text{m}^3 \) | 4. | \(10^2 / \text{m}^3\) |
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In a semiconducting material, the mobilities of electrons and holes are \(\mu_e\) and \(\mu_{h}\) respectively. Which of the following is true?
1. \(\mu_{e} > \mu _{h}\)
2. \(\mu_{e} < \mu _{h}\)
3. \(\mu_{e} = \mu _{h}\)
4. \(\mu_{e} <0; ~\mu _{h}>0\)
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1. \(1.5~\Omega\)
2. \(5~\Omega\)
3. \(6.67~\Omega\)
4. \(200~\Omega\)
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The figure shows two NAND gates followed by a NOR gate. Which of the following logic gate does the figure represent?
1. OR
2. AND
3. NAND
4. None of these
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The diagram of a logic circuit is given below. The output \(F\) of the circuit is represented by:
1. \(W(X+Y)\)
2. \(W\cdot (X\cdot Y)\)
3. \(W+ (X\cdot Y)\)
4. \(W+(X+Y)\)
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How much is the forbidden gap (approximately) in the energy bands of germanium at room temperature?
1. \(1.1~\text{eV}\)
2. \(0.1~\text{eV}\)
3. \(0.67~\text{eV}\)
4. \(6.7~\text{eV}\)
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| 1. | In the circuit (1) and (2) |
| 2. | In the circuit (2) and (3) |
| 3. | In the circuit (1) and (3) |
| 4. | Only in the circuit (1) |
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