As the temperature of semiconductor is increased the average number of free char

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Question
As the temperature of semiconductor is increased
Options
A. the average number of free charge carriers decreases
B. the average number of free charge carriers increases
C. the average number of free charge carriers remains the same
D. the average number of free charge carriers may increase or decrease

Correct Answer

the average number of free charge carriers increases

Explanation

As temperature increases, conductivity of semi- conductors increases.

Materials and Components problems

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1. Some ceramic materials become superconducting
Options
A. below liquid helium temperature
B. between liquid helium and liquid nitrogen temperature
C. above liquid nitrogen but below room temperature
D. at room temperature

4. A piece of copper and another piece of Germanium are cooled from 30�C to 80 K. The resistance of
Options
A. copper decreases and germanium increases
B. both decreases
C. both increases
D. copper increases and germanium decreases

6. For an insulating material, dielectric strength and dielectric losses should be
Options
A. high and high
B. low and high
C. high and low
D. low and low

8. Assertion (A): Ferrites are very useful at very high frequencies.
Reason (R): Ferrites have high permeability and high resistivity.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

9. If v is velocity of electron, ?₀ is absolute permittivity, m is mass of electron, e is charge on electron and r is the radius of orbit of electron in hydrogen atom, the stability of orbit requires the following equation to be satisfied
Options
A.
B.
C.
D.

10. Assertion (A): For a dielectric, P = ?₀(?_r - 1) E.
Reason (R): Dipole moment per unit volume is called polarization of dielectric.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

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