If the temperature of an extrinsic semiconductor is increased so that the intrin

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Question
If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
Options
A. the majority carrier density is doubled
B. the minority carrier density is doubled
C. the minority carrier density becomes 4 times the original value
D. both the majority and minority carrier densities double

Correct Answer

both the majority and minority carrier densities double

Explanation

As the intrinsic carrier concentration is doubled, the concentration of both electrons and holes is doubled.

Materials and Components problems

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1. Which capacitor-store higher amount of energy?
Options
A. Air capacitor
B. Paper capacitor
C. Mica capacitor
D. Plastic film capacitor

2. Assertion (A): Ferroelectric materials have spontaneous polarization.
Reason (R): Above curie temperature, ? = for ferro-electric materials.
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

3. Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90�.
Reason (R): When subjected to ac fields, the dielectric constant can be expressed as ?^'_r - j?^"_r.
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

4. The number of valence electrons in donor impurity are
Options
A. 5
B. 4
C. 3
D. 1

5. When an electric field E is applied to solid and liquid insulating materials, the internal field E_i acting at the location of atom is such that
Options
A. E_i = E
B. E_i > E
C. E_i < E
D. E_i may be equal to or less than E

6. Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.
Reason (R): For diamagnetic as well as paramagnetic materials, ?_r is nearly equal to 1.
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

7. Which element exhibits the property of inertia?
Options
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance

8. In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons.
Options
A. True
B. False

10. Assertion (A): If E is available energy state eV and E_F is Fermi level, then probability of energy state E being occupied = 0.5.
Reason (R): .
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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