Semiconductor Electronics: Materials, Devices and Simple Circuits Test 10

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 10

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Weekly Quiz Competition

Question 1
1 / -0

In an intrinsic semiconductor, the number of electrons in the conduction band is ________ the number of holes in the valence band.

A
equal to

B
less than

C
greater than

D
none of these

Solution

In an intrinsic semiconductor, the number density of electrons is equal to the number density of holes i.e $$ne=nh$$.
Since there is no doping, no extra hole or electron is produced.
Question 2
1 / -0

The energy gap in glass at room temperature is

A
Greater than that in a semiconductor.

B
Less than that in a good conductor.

C
Greater than that in a good conductor.

D
Both (1) and (3) are true.

Solution

Glass is an insulator. The energy gap in a glass is greater than that of semiconductor and a good conductor.
Question 3
1 / -0

Materials which allow only larger currents to flow through them are

A
Insulators

B
Semi-conductors

C
Conductors

D
Alloys

Solution

Semiconductors in their natural state are poor conductors because a current requires the flow of electrons, and semiconductors have their valence band filled, preventing the entry flow of new electrons. Thus semi-conductors allows a large current to pass through them.
Question 4
1 / -0

In an intrinsic semiconductor, if $$N_e$$ is the number of electrons in the conduction band and $$N_p$$ is the number of holes in the valence band then.

A
$$N_e > N_p$$

B
$$N_e = N_p$$

C
$$N_e < N_p$$

D
None of the above

Solution

In an intrinsic semiconductor, the number of electrons in the conduction band is equal to the number of holes in the valence band, so $$N_{e}=N_{p}$$.
Question 5
1 / -0

A pure semiconductor at absolute zero has

A
Absence of electrons in the conduction band.

B
All the electrons occupying the valence band.

C
Large $$E_g$$ value.

D
All of the above.

Solution

At absolute zero temperature, in a pure semiconductor, all electrons occupy the valence band and no electrons are present in the conduction band. The forbidden gap energy $$E_g$$ is large.
Question 6
1 / -0

The symbolic representation of four logic gates are given below :
The logic symbols for OR, NOT and NAND gates are respectively :

A
(i), (iii), (iv)

B
(iii), (iv), (ii)

C
(iv), (i), (iii)

D
(iv), (ii), (i)

Solution
Question 7
1 / -0

In n-type of semiconductor, majority carries are

A
Positron

B
Electron

C
Holes

D
Impure particles

Solution

In n-type semiconductor, large number of free electrons is present. Hence, free electrons are the majority charge carriers in the n-type semiconductor. The free electrons (majority charge carriers) carry most of the electric charge or electric current in the n-type semiconductor.
Question 8
1 / -0

Number of electrons in the valence shell of a semiconductor is

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution

The valency of semiconductor (Ge or Si) is four, hence it has $$4$$ valence electrons in the outermost orbit of the Ge or Si-atom
Question 9
1 / -0

In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

A
$$1 MeV$$

B
$$0.1 MeV$$

C
$$1 eV$$

D
$$5 eV$$

Solution

Forbidden energy gap, also known as band gap refers to the energy difference $$(eV)$$ between the top of valence band and the bottom of the conduction band in materials. Current flowing through the materials is due to the electron transfer from the valence band to the conduction band.
Insulators do not conduct electricity because a large amount of energy is needed for the electrons to cross the forbidden energy gap. Moreover the forbidden energy gap is the widest $$(> 5 eV)$$ in case of insulators.
Example: Forbidden energy gap in diamond is nearly $$5.5 eV$$.
Question 10
1 / -0

The gate for which output is high, if at least one input is low is

A
NAND

B
NOR

C
AND

D
OR

Solution

The truth table of NAND gate is shown as above, which implies that if at least one of the input is low then the output is high.

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Re-Attempt Weekly Quiz Competition

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 10

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 10

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Rank

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SHARING IS CARING

Question 1

equal to

less than

greater than

none of these

Solution

Question 2

Greater than that in a semiconductor.

Less than that in a good conductor.

Greater than that in a good conductor.

Both (1) and (3) are true.

Solution

Question 3

Insulators

Semi-conductors

Conductors

Alloys

Solution

Question 4

$$N_e > N_p$$

$$N_e = N_p$$

$$N_e < N_p$$

None of the above

Solution

Question 5

Absence of electrons in the conduction band.

All the electrons occupying the valence band.

Large $$E_g$$ value.

All of the above.

Solution

Question 6

(i), (iii), (iv)

(iii), (iv), (ii)

(iv), (i), (iii)

(iv), (ii), (i)

Solution

Question 7

Positron

Electron

Holes

Impure particles

Solution

Question 8

$$1$$

$$2$$

$$3$$

$$4$$

Solution

Question 9

$$1 MeV$$

$$0.1 MeV$$

$$1 eV$$

$$5 eV$$

Solution

Question 10

NAND

NOR

AND

OR

Solution

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