1
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If the ratio of electron and hole currents in a semiconductor is $7 / 4$ and the ratio of drift velocities of electrons and holes is $5 / 4$, then ratio of concentrations of electrons and holes will be
A
$5: 7$
B
$7: 5$
C
$5: 9$
D
$9: 5$
2
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When a semiconductor is doped with donor impurity

A
the hole concentration decreases and electron concentration increases
B
the hole concentration increases and electron concentration decreases
C
both hole concentration and electron concentration increase
D
both hole concentration and electron concentration decrease
3
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The need for modulation is

A
to increase the intensity of audio signal
B
to decrease the intensity of audio signal
C
to transmit audio signal to large distance
D
to increase the frequency of audio signal
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