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 Morning Shift
MCQ (Single Correct Answer)
+1
-0
In a transistor, the base current is $10 \mu \mathrm{~A}$ and the emitter current is 1 mA , then the collector current is
A
$990 \mu \mathrm{~A}$
B
$100 \mu \mathrm{~A}$
C
$1010 \mu \mathrm{~A}$
D
$90 \mu \mathrm{~A}$
4
TS EAMCET 2023 (Online) 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
If the output of a NAND gate is given as input to a NOT gate, the resultant gate is
A
AND
B
$O R$
C
NOR
D
NOT
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