Semiconductor Electronics: Materials, Devices and Simple Circuits Test 16

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement(s) is/are true about holes?

A
They flow from positive terminal to negative terminal

B
They flow from negative terminal to positive terminal

C
They do not flow

D
None of these

Solution

electrons flow from negative to positive terminal of battery. whenever the electric current flows from positive terminal of battery to negative terminal of battery is called conventional current. the conventional current has same direction of flow of holes but opposite to direction of flow of from electron.
Question 2
1 / -0

Holes are created when:

A
electric discharge causes damage to semicondcutors

B
there are too many electrons

C
a co-valent bond is broken due to thermal energy, the removal of one electron leaves a vacancy

D
none of these

Solution

Holes are created when a co-valent bond is broken due to thermal energy. The removal of one electron leaves a vacancy known as a hole.
Question 3
1 / -0

The concepts of holes is introduced based on

A
the notion that it is a whole lot easier to keep track of the missing particles in an "almost-full" band

B
the keeping track of the actual electrons in that band

C
the charge of holes

D
none of the above

Solution

The concept of holes was introduced so as to occupy the empty spaces left by the missing electron. For example, in a valence band, when an electron jumps from valence to conduction band, an empty space is created in valence band which is occupied by a hole.
Question 4
1 / -0

In p-type semiconductors, holes are:

A
majority carriers

B
minority carriers

C
absent

D
none of the above

Solution

P-type semiconductors are those which have a p-type impurity. A p-type impurity is a material in which the atoms have only 3 Valence Electrons. When they are added to a pure semiconductor, each atom gets bonded with 3 of atoms of the semiconductor. Between the 4th atom of the semiconductor and the atom of the impurity, there is an empty space due to lack of an electron. This empty space is known as a hole. Because of a large existence of P-type material in a p-type semiconductor, it has more holes as compared to free electrons. Hence holes are majority carriers.
Question 5
1 / -0

Digital circuit can be made by repetitive use of this gate-

A
AND

B
OR

C
NOT

D
NAND

Solution

NAND and NOR gates are the basic building blocks of the digital circuit which means that all other gates can be synthesized using NAND (or NOR) gate only.
Question 6
1 / -0

In physics, chemistry, and electronic engineering, _______________ is the lack of an electron at a position where one could exist in an atom or atomic lattice.

A
an electron hole

B
electron

C
proton

D
neutron

Solution

A hole is an absence of an electron in a particular place in an atom. Although it is not a physical particle, a hole can be passed from atom to atom in a semiconductor material.
Question 7
1 / -0

A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.

A
HOMO

B
valence band

C
conduction band

D
LUMO

Solution

The band gap in case of semiconductors is of order $$3-4$$ eV. At absolute zero, the valence band is filled and conduction band is empty, so it behaves as an insulator. As the temperature is raised, electrons in the valence band gain sufficient energy to overcome the band gap and jump to the conduction band.
Question 8
1 / -0

The relationship between band gap energy and temperature can be described by ____________.

A
supersymmetric quantum mechanics.

B
hyperuniformity.

C
phonons theory.

D
Varshni's empirical expression.

Solution

The Varshni's empirical expression gives the relationship between band gap energy and temperature given by:
$$Eg(T)=Eg(0)-\dfrac{\alpha T^{2}}{T+\beta}$$
where, Eg(0), α, β are material constants.
Question 9
1 / -0

What will be the input of $$A$$ and $$B$$ for Boolean expression

A
$$0,0$$

B
$$0,1$$

C
$$1,0$$

D
$$1,1$$

Solution

$$\left( \overline { A+B } \right) \left( \overline { A.B } \right) =1$$
Answer can be formed by trial and error.
$$ (A)(0,0)\Rightarrow A=0,B=0\\ (\overline { 0+0 } )(\overline { 0.0 } )=(\overline { 0 } )(\overline { 0 } )\\ =1.1=1$$
Question 10
1 / -0

A semiconductor device is connected in a series circuit with a battery and resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be

A
a p-type semiconductor

B
an n-type semiconductor

C
a p-n junction

D
an intrinsic semiconductor

Solution

Answer:-
A $$P-n$$ junction diode.
Reason:- An ideal diode acts like an open switch when rivers biased and like a closed switch when forward biased.

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 16

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 16

Score

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Rank

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SHARING IS CARING

Question 1

They flow from positive terminal to negative terminal

They flow from negative terminal to positive terminal

They do not flow

None of these

Solution

Question 2

electric discharge causes damage to semicondcutors

there are too many electrons

a co-valent bond is broken due to thermal energy, the removal of one electron leaves a vacancy

none of these

Solution

Question 3

the notion that it is a whole lot easier to keep track of the missing particles in an "almost-full" band

the keeping track of the actual electrons in that band

the charge of holes

none of the above

Solution

Question 4

majority carriers

minority carriers

absent

none of the above

Solution

Question 5

AND

OR

NOT

NAND

Solution

Question 6

an electron hole

electron

proton

neutron

Solution

Question 7

HOMO

valence band

conduction band

LUMO

Solution

Question 8

supersymmetric quantum mechanics.

hyperuniformity.

phonons theory.

Varshni's empirical expression.

Solution

Question 9

$$0,0$$

$$0,1$$

$$1,0$$

$$1,1$$

Solution

Question 10

a p-type semiconductor

an n-type semiconductor

a p-n junction

an intrinsic semiconductor

Solution

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