When a pentavalent impurity is added, the semiconductor becomes p type n type in

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Question
When a pentavalent impurity is added, the semiconductor becomes
Options
A. p type
B. n type
C. intrinsic
D. neutral

Correct Answer

n type

Materials and Components problems

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1. Assertion (A): Orbital magnetic moment of an electron in an atom is of the order of 1 Bohr magneton.
Reason (R): 1 Bohr magneton = 9.27 x 10^-24 A/m².
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

2. Assertion (A): An electron having charge - e and mass m and lying in an electric field E is subjected to an acceleration - (e/m) E.
Reason (R): If there are n electrons/m³ moving with velocity v_x and each electron has a charge - e, the current density J = - n ev_x.
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. If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K without any altering the dielectric material, the new capacitor will have capacitance and selectivity as
Options
A. C,
B. , Q
C. ,
D. C, K

7. Assertion (A): For most metals, Fermi energy E_F is less than 10 eV.
Reason (R): Fermi level of a metal is given by E_F = 3.64 x 10^-19 (n)^2/3 where n is number of free electrons/m³ of metal.
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. As regards ?₀ and ?_r (absolute and relative permittivity)
Options
A. both ?₀ and ?_r can be interpreted in terms of atomic properties of medium
B. only ?_r can be interpreted in terms of atomic properties of medium
C. only ?₀ can be interpreted in terms of atomic properties
D. ?_r has no physical significance

10. An electron is moving in a circular orbit of radius R at angular velocity ?₀ in a field free space. If a magnetic field B is created, the velocity of electron ? will be given by the equation
Options
A.
B.
C.
D.

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