Free Printable Self-Assessment Quiz

1.

A p-n junction is a metallic junction.

a)

True

b)

False

c)

Incomplete Information

d)

None

2.

Select the correct statement(s) for depletion approximation in a p-n junction.

a)

Electric field outside the depletion width is zero.

b)

Electric field outside the depletion width is finite in value.

c)

Zero electric field exists inside the depletion width.

d)

All of the above.

3.

The built-in potential in a p-n junction is equal to

a)

Sum of absolute values of Fermi potentials of p-type and n-type regions.

b)

Sum of depletion widths in the p-type and n-type regions.

c)

0.7 V

d)

0.33 V

4.

Select the correct relationship between electron energy (E), and potential ( $\phi$ ).

a)

$E=-q\phi$

b)

$E=q+\phi$

c)

$E=q\phi$

d)

$E=q^2\phi$

5.

The energy required to release an electron from the Fermi level to vacuum level is known as

a)

electron affinity

b)

bandgap

c)

work-function

d)

potential

6.

Which one of the following is a property of vacuum level along the length of a device/ material?

a)

It always has a constant value.

b)

It is continuous in nature.

c)

It possesses multiple values at every position.

d)

Its value is equal to the energy bandgap.

7.

Select the correct form of 1-D Poisson equation.

a)

$\frac{\partial^2\Phi}{\partial x^2}=q\rho$

b)

$\frac{\partial^2\Phi}{\partial x^2}=-\left(\frac{q\Phi}{\epsilon}\right)$

c)

$\frac{\partial\xi}{\partial x}=-q^2\rho$

d)

$\frac{\partial\xi}{\partial x}=\frac{\rho}{\epsilon}$

8.

The maximum built-in electric field in a p-n junction in equilibrium lies

a)

at the edge of p-type depletion region

b)

at the edge of the n-type depletion width

c)

at the junction.

d)

at the contact where bias is applied.

9.

The nature of the plot of potential in a p-n junction in equilibrium is

a)

linear

b)

cubic

c)

polynomial

d)

quadratic

10.

Which of the following boundary conditions are applied during the derivation of electric field in a p-n junction in equilibrium?

a)

electric field at the junction is maximum.

b)

charge neutrality condition.

c)

electric field at the edges of the depletion region is zero.

d)

charge density at the edges is zero.

11.

Outside the depletion width in a p-n junction in equilibrium, what is the status of potential curve?

a)

linearly increasing

b)

constant

c)

cubic

d)

logarithmic

12.

Which of the following is true in a p-n junction in equilibrium? Here, A is the cross-sectional area of the p-n junction, and other symbols have usual meanings.

a)

$qN_AAx_p=qN_DAx_n$

b)

$Ax_p=Ax_n$

c)

$q\Phi_p=q\Phi_n$

d)

None of the above

Self-Assessment Quiz - 1

Total questions: 12

Worksheet time: 36mins

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