Miscellaneous Problems on Semiconductor Electronics: Materials, Devices & Simple Circuits
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365268 A \(PN\) junction diode cannot be used

1 As rectifier
2 For converting light energy to electric energy
3 For getting light radiation
4 For increasing the amplitude of an \(ac\) signal
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365269 The band gap in germanium is \({E}_{{g}}=0.64 \,{eV}\). Assuming that the number of hole-electron pairs is proportional to \({e}^{\left(-{E}_{{g}} / 2 k {~T}\right)}\), find the fractional increase in the number of charge carriers in pure germanium as the temperature is increased from \(300 {~K}\) to \(384 {~K}\).
[Take \({k = 1.4 \times {{10}^{ - 23}},\ln (14.4) = \frac{8}{3}}\)]

1 13.4
2 17.2
3 10.6
4 15.4
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365270 The typical ionisation energy of a donor in silicon is

1 \(10.0\,eV\)
2 \(1.0\,eV\)
3 \(0.1\,eV\)
4 \(0.001\,eV\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365271 Assertion :
Diode lasers are used as optical sources in optical communication.
Reason :
Diode lasers consume less energy.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the 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

365272 Assertion :
A pure semiconductor has negative temperature coefficient of resistance.
Reason :
On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

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

365268 A \(PN\) junction diode cannot be used

1 As rectifier
2 For converting light energy to electric energy
3 For getting light radiation
4 For increasing the amplitude of an \(ac\) signal
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365269 The band gap in germanium is \({E}_{{g}}=0.64 \,{eV}\). Assuming that the number of hole-electron pairs is proportional to \({e}^{\left(-{E}_{{g}} / 2 k {~T}\right)}\), find the fractional increase in the number of charge carriers in pure germanium as the temperature is increased from \(300 {~K}\) to \(384 {~K}\).
[Take \({k = 1.4 \times {{10}^{ - 23}},\ln (14.4) = \frac{8}{3}}\)]

1 13.4
2 17.2
3 10.6
4 15.4
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365270 The typical ionisation energy of a donor in silicon is

1 \(10.0\,eV\)
2 \(1.0\,eV\)
3 \(0.1\,eV\)
4 \(0.001\,eV\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365271 Assertion :
Diode lasers are used as optical sources in optical communication.
Reason :
Diode lasers consume less energy.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the 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

365272 Assertion :
A pure semiconductor has negative temperature coefficient of resistance.
Reason :
On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

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

365268 A \(PN\) junction diode cannot be used

1 As rectifier
2 For converting light energy to electric energy
3 For getting light radiation
4 For increasing the amplitude of an \(ac\) signal
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365269 The band gap in germanium is \({E}_{{g}}=0.64 \,{eV}\). Assuming that the number of hole-electron pairs is proportional to \({e}^{\left(-{E}_{{g}} / 2 k {~T}\right)}\), find the fractional increase in the number of charge carriers in pure germanium as the temperature is increased from \(300 {~K}\) to \(384 {~K}\).
[Take \({k = 1.4 \times {{10}^{ - 23}},\ln (14.4) = \frac{8}{3}}\)]

1 13.4
2 17.2
3 10.6
4 15.4
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365270 The typical ionisation energy of a donor in silicon is

1 \(10.0\,eV\)
2 \(1.0\,eV\)
3 \(0.1\,eV\)
4 \(0.001\,eV\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365271 Assertion :
Diode lasers are used as optical sources in optical communication.
Reason :
Diode lasers consume less energy.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the 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

365272 Assertion :
A pure semiconductor has negative temperature coefficient of resistance.
Reason :
On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

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

365268 A \(PN\) junction diode cannot be used

1 As rectifier
2 For converting light energy to electric energy
3 For getting light radiation
4 For increasing the amplitude of an \(ac\) signal
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365269 The band gap in germanium is \({E}_{{g}}=0.64 \,{eV}\). Assuming that the number of hole-electron pairs is proportional to \({e}^{\left(-{E}_{{g}} / 2 k {~T}\right)}\), find the fractional increase in the number of charge carriers in pure germanium as the temperature is increased from \(300 {~K}\) to \(384 {~K}\).
[Take \({k = 1.4 \times {{10}^{ - 23}},\ln (14.4) = \frac{8}{3}}\)]

1 13.4
2 17.2
3 10.6
4 15.4
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365270 The typical ionisation energy of a donor in silicon is

1 \(10.0\,eV\)
2 \(1.0\,eV\)
3 \(0.1\,eV\)
4 \(0.001\,eV\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365271 Assertion :
Diode lasers are used as optical sources in optical communication.
Reason :
Diode lasers consume less energy.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the 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

365272 Assertion :
A pure semiconductor has negative temperature coefficient of resistance.
Reason :
On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

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

365268 A \(PN\) junction diode cannot be used

1 As rectifier
2 For converting light energy to electric energy
3 For getting light radiation
4 For increasing the amplitude of an \(ac\) signal
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365269 The band gap in germanium is \({E}_{{g}}=0.64 \,{eV}\). Assuming that the number of hole-electron pairs is proportional to \({e}^{\left(-{E}_{{g}} / 2 k {~T}\right)}\), find the fractional increase in the number of charge carriers in pure germanium as the temperature is increased from \(300 {~K}\) to \(384 {~K}\).
[Take \({k = 1.4 \times {{10}^{ - 23}},\ln (14.4) = \frac{8}{3}}\)]

1 13.4
2 17.2
3 10.6
4 15.4
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365270 The typical ionisation energy of a donor in silicon is

1 \(10.0\,eV\)
2 \(1.0\,eV\)
3 \(0.1\,eV\)
4 \(0.001\,eV\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365271 Assertion :
Diode lasers are used as optical sources in optical communication.
Reason :
Diode lasers consume less energy.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the 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

365272 Assertion :
A pure semiconductor has negative temperature coefficient of resistance.
Reason :
On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.