UGC NET 2019 Paper 2 Electronic Science Prev Year Paper (21-Jun-2019) (Shift 1)

Question 1

In an open circuited p-n junction, the contact difference of potential is

Accepted Answer

$\frac{kT}{q} ln&af;\frac{(N_A N_D)}{(n_1^2 )}$

Answer

$\frac{kT}{q}$

Answer

$\frac{kT}{q} ln&af;\frac{(N_D)}{(n_1^2 )}$

Answer

$\frac{kT}{q}ln&af;\frac{N_A}{(N_D,n_1^2 )}$

Question 2

The equation for f(E) is the Fermi-Dirac probability function and is

Accepted Answer

$f\left( E \right) = \frac{1}{{1 + \exp \left( {\frac{{E - {E_F}}}{{{K_B}T}}} \right)}}$

Answer

$f\left( E \right) = \frac{1}{{1 + \exp \left( {\frac{{{E_F-E}}}{{{K_B}~~T}}} \right)}}$

Answer

$f\left( E \right) = \frac{1}{{1 - \exp \left( {\frac{{E - {E_F}}}{{{K_B}~~T}}} \right)}}$

Answer

$f\left( E \right) = \frac{1}{{1 - \exp \left( {\frac{{{E_F-E}}}{{{K_B}~~T}}} \right)}}$

Question 3

If the forward bias is applied to the diode, holes are injected from p side to n side, the concentration P nof holes in the n side above its thermal equilibrium value P n(0) is given by

Accepted Answer

P n0 + P n(0) exp (-x / L p)

Answer

P n0 &ndash; P n(0) exp (-x / L p)

Answer

P n0 + P n(0) exp (+x / L p)

Answer

P n0 &ndash; P n(0) exp (+x / L p)

Question 4

The Ebers-Moll equation for the emitter current is

Accepted Answer

$a_{11} [exp&af;(\frac{V_E}{V_T} )-1]+a_{12} [exp(\frac{&af;V_C}{V_T})-1]$

Answer

$a_{11} [exp&af;(\frac{V_C}{V_T} )-1]+a_{12} [exp(\frac{&af;V_E}{V_T})-1]$

Answer

$a_{11} [exp&af;(\frac{V_E}{V_T} )+1]+a_{12} [exp(\frac{&af;V_C}{V_T})+1]$

Answer

$a_{11} [exp&af;(\frac{V_C}{V_T} )+1]+a_{12} [exp(\frac{&af;V_E}{V_T})+1]$

Question 5

The device which is used for detecting light intensity is

Accepted Answer

Photodiode

Answer

LED

Answer

LCD

Answer

P-I-N diode

UGC NET 2019 Paper 2 Electronic Science Prev Year Paper (21-Jun-2019) (Shift 1)

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