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Home
Semiconductor Devices Test - 85
Semiconductor Devices Test - 85
Result
Semiconductor Devices Test - 85
/
Score
-
Rank
Time Taken:
-
Question
1/10
4 / -1
When phosphorus and antimony are mixed ingermanium, then
Correct
Wrong
Skipped
A
P–type semiconductor is formed
Correct
Wrong
Skipped
B
N–type semiconductor is formed
Correct
Wrong
Skipped
C
Both (a) and (b)
Correct
Wrong
Skipped
D
None of the above
Question
2/10
4 / -1
To a germanium sample, traces of gallium are added as an impurity. The resultant sample would behave like
Correct
Wrong
Skipped
A
A conductor
Correct
Wrong
Skipped
B
A P–type semiconductor
Correct
Wrong
Skipped
C
An N–type semiconductor
Correct
Wrong
Skipped
D
An insulator
Question
3/10
4 / -1
The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbingenergy is
Correct
Wrong
Skipped
A
10888 Å
Correct
Wrong
Skipped
B
1088.8 Å
Correct
Wrong
Skipped
C
108.88 Å
Correct
Wrong
Skipped
D
10.888 Å
Solutions
Question
4/10
4 / -1
The charge on a hole is equal to the charge of
Correct
Wrong
Skipped
A
Zero
Correct
Wrong
Skipped
B
Proton
Correct
Wrong
Skipped
C
Neutron
Correct
Wrong
Skipped
D
Electron
Question
5/10
4 / -1
When germanium is doped with phosphorus, the dopedmaterial has
Correct
Wrong
Skipped
A
Excess positive charge
Correct
Wrong
Skipped
B
Excess negative charge
Correct
Wrong
Skipped
C
More negative current carriers
Correct
Wrong
Skipped
D
More positive current carriers
Question
6/10
4 / -1
A Ge specimen is doped with Al. The concentration of acceptor atoms is ~10
21
atoms/m
3
. Given that the intrinsic concentration of electron hole pairs is ~10
19
/ m
3
, the concentration of electrons in thespecimen is
Correct
Wrong
Skipped
A
10
17
/m
3
Correct
Wrong
Skipped
B
10
15
/ m
3
Correct
Wrong
Skipped
C
10
4
/ m
3
Correct
Wrong
Skipped
D
10
2
/ m
3
Solutions
Question
7/10
4 / -1
Which of the following has negative temperature coefficient of resistance?
Correct
Wrong
Skipped
A
Copper
Correct
Wrong
Skipped
B
Aluminum
Correct
Wrong
Skipped
C
Iron
Correct
Wrong
Skipped
D
Germanium
Question
8/10
4 / -1
In semiconductors at a room temperature
Correct
Wrong
Skipped
A
The valence band is partially empty and the conduction band is partially filled
Correct
Wrong
Skipped
B
The valence band is completely filled and the conduction band is partially filled
Correct
Wrong
Skipped
C
The valence band is completely filled
Correct
Wrong
Skipped
D
The conduction band is completely empty
Question
9/10
4 / -1
Regarding a semiconductor which one of the following is wrong?
Correct
Wrong
Skipped
A
There are no free electrons at room temperature
Correct
Wrong
Skipped
B
There are no free electrons at 0 K
Correct
Wrong
Skipped
C
The number of free electrons increases with rise of temperature
Correct
Wrong
Skipped
D
The charge carriers are electrons and holes
Question
10/10
4 / -1
Which of the following statements is true for an N–type semiconductor?
Correct
Wrong
Skipped
A
The donor level lies closely below the bottom of the conduction band
Correct
Wrong
Skipped
B
The donor level lies closely above the top of the valence band
Correct
Wrong
Skipped
C
The donor level lies at the halfway mark of the forbidden energy gap
Correct
Wrong
Skipped
D
None of the above
Re-attempt
-
Correct (
-
)
Wrong (
-
)
Skipped (
-
)
1
2
3
4
5
6
7
8
9
10
Re-attempt
-
Correct (
-
)
Wrong (
-
)
Skipped (
-
)
1
2
3
4
5
6
7
8
9
10
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