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Q. No.| 1. | decreases for conductors but increases for semiconductors. |
| 2. | increases for both conductors and semiconductors. |
| 3. | decreases for both conductors and semiconductors. |
| 4. | increases for conductors but decreases for semiconductors. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a semiconductor,
| (a) | there are no free electrons at \(0~\text{K}.\) |
| (b) | there are no free electrons at any temperature. |
| (c) | the number of free electrons increases with temperature. |
| (d) | the number of free electrons is less than that in a conductor. |
1. (a), (b)
2. (b), (c)
3. (a), (c), (d)
4. (a), (b), (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | \(414\) nm | 2. | \(300\) nm |
| 3. | \(830\) nm | 4. | \(207\) nm |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | The resistivity of a semiconductor increases with an increase in temperature. |
| 2. | Substances with an energy gap of the order of \(10\) eV are insulators. |
| 3. | In conductors, the valence and conduction bands may overlap. |
| 4. | The conductivity of a semiconductor increases with an increase in temperature. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCarbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by , and respectively. Which one of the following relationships is true in their case?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology\(\mathrm{C}\), \(\mathrm{Si}\), and \(\mathrm{Ge}\) have the same lattice structure. Why is the \(\mathrm{C}\) insulator?
| 1. | because ionization energy for \(\mathrm{C}\) is the least in comparison to \(\mathrm{Si}\) and \(\mathrm{Ge}\). |
| 2. | because ionization energy for \(\mathrm{C}\) is highest in comparison to \(\mathrm{Si}\) and \(\mathrm{Ge}\). |
| 3. | the number of free electrons for conduction in \(\mathrm{Ge}\) and \(\mathrm{Si}\) is significant but negligibly small for \(\mathrm{C}\). |
| 4. | both (2) and (3). |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHole is:
| 1. | an anti-particle of electron. |
| 2. | a vacancy created when an electron leaves a covalent bond. |
| 3. | absence of free electrons. |
| 4. | an artificially created particle. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLet \(n_{p}\) and \(n_{e}\) be the number of holes and conduction electrons in an intrinsic semiconductor. Then:
1. \(n_{p}> n_{e}\)
2. \(n_{p}= n_{e}\)
3. \(n_{p}< n_{e}\)
4. \(n_{p}\neq n_{e}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA \(\mathrm{p}\text-\)type semiconductor is:
| 1. | positively charged |
| 2. | negatively charged |
| 3. | uncharged |
| 4. | uncharged at \(0~\text{K}\) but charged at higher temperatures |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is correct for \(\mathrm{n}\)-type semiconductors?
| 1. | electron is the majority carriers and trivalent atoms are dopants. |
| 2. | electrons are majority carriers and pentavalent atoms are dopants. |
| 3. | holes are majority carriers and pentavalent atoms are dopants. |
| 4. | holes are majority carriers and trivalent atoms are dopants. |
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