Classification of Solids
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365171 If the resistivity of copper is \(1.7 \times {10^{ - 6}}\Omega \,cm\), then the mobility of electrons in copper, if each atom of copper contributes one free electron for conduction, is [The atomic weight of copper is 63.54 and its density is 8.96 \(g\)/\(cc\)]:

1 \(23.36\,c{m^2}/Vs\)
2 \(503.03\,c{m^2}/Vs\)
3 \(43.25\,c{m^2}/Vs\)
4 \(88.0\,c{m^2}/Vs\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365172 In sample of pure silicon \({10^{13}}atom{\rm{/}}c{m^3}\) is mixed of phosphorus. If all donar atoms are active then what will be resistivity at \(20^\circ C\) if mobility of electron is \(1200\;\,c{m^2}{\rm{/}}volts\,{\rm{ - }}\,s\)

1 \(0.5209\,ohm\,cm\)
2 \(5.209\,ohm\,cm\)
3 \(52.09\,ohm\,cm\)
4 \(520.9\,ohm\,cm\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365173 Assertion :
Electron has higher mobility than hole in a semiconductor.
Reason :
Mass of electron is less than the mass of hole.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365174 Choose the only false statement from the following.

1 Substances with energy gap of the order of \(10\,eV\) are insulators.
2 The conductivity of a semiconductor increases with increase in temperature.
3 In conductors, the valence and conduction bands may overlap.
4 The resistivity of a semiconductor increases with increase in temperature.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365175 If the ratio of concentration of electrons to that of holes in a semiconductor is (4/7) and the ratio of currents is (5/7), then the ratio of their drift velocities is:

1 \(3 / 5\)
2 \(4 / 5\)
3 \(5 / 4\)
4 \(4 / 3\)
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365171 If the resistivity of copper is \(1.7 \times {10^{ - 6}}\Omega \,cm\), then the mobility of electrons in copper, if each atom of copper contributes one free electron for conduction, is [The atomic weight of copper is 63.54 and its density is 8.96 \(g\)/\(cc\)]:

1 \(23.36\,c{m^2}/Vs\)
2 \(503.03\,c{m^2}/Vs\)
3 \(43.25\,c{m^2}/Vs\)
4 \(88.0\,c{m^2}/Vs\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365172 In sample of pure silicon \({10^{13}}atom{\rm{/}}c{m^3}\) is mixed of phosphorus. If all donar atoms are active then what will be resistivity at \(20^\circ C\) if mobility of electron is \(1200\;\,c{m^2}{\rm{/}}volts\,{\rm{ - }}\,s\)

1 \(0.5209\,ohm\,cm\)
2 \(5.209\,ohm\,cm\)
3 \(52.09\,ohm\,cm\)
4 \(520.9\,ohm\,cm\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365173 Assertion :
Electron has higher mobility than hole in a semiconductor.
Reason :
Mass of electron is less than the mass of hole.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365174 Choose the only false statement from the following.

1 Substances with energy gap of the order of \(10\,eV\) are insulators.
2 The conductivity of a semiconductor increases with increase in temperature.
3 In conductors, the valence and conduction bands may overlap.
4 The resistivity of a semiconductor increases with increase in temperature.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365175 If the ratio of concentration of electrons to that of holes in a semiconductor is (4/7) and the ratio of currents is (5/7), then the ratio of their drift velocities is:

1 \(3 / 5\)
2 \(4 / 5\)
3 \(5 / 4\)
4 \(4 / 3\)
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365171 If the resistivity of copper is \(1.7 \times {10^{ - 6}}\Omega \,cm\), then the mobility of electrons in copper, if each atom of copper contributes one free electron for conduction, is [The atomic weight of copper is 63.54 and its density is 8.96 \(g\)/\(cc\)]:

1 \(23.36\,c{m^2}/Vs\)
2 \(503.03\,c{m^2}/Vs\)
3 \(43.25\,c{m^2}/Vs\)
4 \(88.0\,c{m^2}/Vs\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365172 In sample of pure silicon \({10^{13}}atom{\rm{/}}c{m^3}\) is mixed of phosphorus. If all donar atoms are active then what will be resistivity at \(20^\circ C\) if mobility of electron is \(1200\;\,c{m^2}{\rm{/}}volts\,{\rm{ - }}\,s\)

1 \(0.5209\,ohm\,cm\)
2 \(5.209\,ohm\,cm\)
3 \(52.09\,ohm\,cm\)
4 \(520.9\,ohm\,cm\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365173 Assertion :
Electron has higher mobility than hole in a semiconductor.
Reason :
Mass of electron is less than the mass of hole.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365174 Choose the only false statement from the following.

1 Substances with energy gap of the order of \(10\,eV\) are insulators.
2 The conductivity of a semiconductor increases with increase in temperature.
3 In conductors, the valence and conduction bands may overlap.
4 The resistivity of a semiconductor increases with increase in temperature.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365175 If the ratio of concentration of electrons to that of holes in a semiconductor is (4/7) and the ratio of currents is (5/7), then the ratio of their drift velocities is:

1 \(3 / 5\)
2 \(4 / 5\)
3 \(5 / 4\)
4 \(4 / 3\)
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365171 If the resistivity of copper is \(1.7 \times {10^{ - 6}}\Omega \,cm\), then the mobility of electrons in copper, if each atom of copper contributes one free electron for conduction, is [The atomic weight of copper is 63.54 and its density is 8.96 \(g\)/\(cc\)]:

1 \(23.36\,c{m^2}/Vs\)
2 \(503.03\,c{m^2}/Vs\)
3 \(43.25\,c{m^2}/Vs\)
4 \(88.0\,c{m^2}/Vs\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365172 In sample of pure silicon \({10^{13}}atom{\rm{/}}c{m^3}\) is mixed of phosphorus. If all donar atoms are active then what will be resistivity at \(20^\circ C\) if mobility of electron is \(1200\;\,c{m^2}{\rm{/}}volts\,{\rm{ - }}\,s\)

1 \(0.5209\,ohm\,cm\)
2 \(5.209\,ohm\,cm\)
3 \(52.09\,ohm\,cm\)
4 \(520.9\,ohm\,cm\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365173 Assertion :
Electron has higher mobility than hole in a semiconductor.
Reason :
Mass of electron is less than the mass of hole.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365174 Choose the only false statement from the following.

1 Substances with energy gap of the order of \(10\,eV\) are insulators.
2 The conductivity of a semiconductor increases with increase in temperature.
3 In conductors, the valence and conduction bands may overlap.
4 The resistivity of a semiconductor increases with increase in temperature.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365175 If the ratio of concentration of electrons to that of holes in a semiconductor is (4/7) and the ratio of currents is (5/7), then the ratio of their drift velocities is:

1 \(3 / 5\)
2 \(4 / 5\)
3 \(5 / 4\)
4 \(4 / 3\)
NEET DIGITAL LIBRARY
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365171 If the resistivity of copper is \(1.7 \times {10^{ - 6}}\Omega \,cm\), then the mobility of electrons in copper, if each atom of copper contributes one free electron for conduction, is [The atomic weight of copper is 63.54 and its density is 8.96 \(g\)/\(cc\)]:

1 \(23.36\,c{m^2}/Vs\)
2 \(503.03\,c{m^2}/Vs\)
3 \(43.25\,c{m^2}/Vs\)
4 \(88.0\,c{m^2}/Vs\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365172 In sample of pure silicon \({10^{13}}atom{\rm{/}}c{m^3}\) is mixed of phosphorus. If all donar atoms are active then what will be resistivity at \(20^\circ C\) if mobility of electron is \(1200\;\,c{m^2}{\rm{/}}volts\,{\rm{ - }}\,s\)

1 \(0.5209\,ohm\,cm\)
2 \(5.209\,ohm\,cm\)
3 \(52.09\,ohm\,cm\)
4 \(520.9\,ohm\,cm\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365173 Assertion :
Electron has higher mobility than hole in a semiconductor.
Reason :
Mass of electron is less than the mass of hole.

1 Both assertion and reason are correct and reason is the correct explanation of assertion.
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.
3 Assertion is correct but reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365174 Choose the only false statement from the following.

1 Substances with energy gap of the order of \(10\,eV\) are insulators.
2 The conductivity of a semiconductor increases with increase in temperature.
3 In conductors, the valence and conduction bands may overlap.
4 The resistivity of a semiconductor increases with increase in temperature.
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365175 If the ratio of concentration of electrons to that of holes in a semiconductor is (4/7) and the ratio of currents is (5/7), then the ratio of their drift velocities is:

1 \(3 / 5\)
2 \(4 / 5\)
3 \(5 / 4\)
4 \(4 / 3\)