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Class 12
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Physics
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Semiconductor Electronics: Materials, Devices and Simple Circuits
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Hard Questions
Semiconductor Electronics Materials Devices And Simple Circuits
Physics
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A circuit of logic gates given below, some input signal A, B, C are given with their output signal x, y and z is given in respective option, choose correct options :
A
If
$A=1,B=1,C=1$
then
$x=0,y=1,z=1$
B
If
$A=0,B=0$
and
$C=1$
then
$x=1,y=0,z=1$
C
If
$A=0,B=0$
and
$C=1$
then
$x=1,y=0,z=0$
D
If OR gate is replaced by NOR gate then net output signal of the circuit becomes
$z=0$
for the input
$A=0,B=0$
and
$C=1$
.
Hard
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The logic circuit shown below has the input waveforms 'A' and 'B' as shown. Pick out the correct output waveform.
A
B
C
D
Hard
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>
The following figure shows a logic gate circuit with two inputs A and B the output Y. The voltage waveforms of A, B and Y are as given-
The logic gate is-
A
OR gate
B
AND gate
C
NAND gate
D
NOR gate
Hard
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A truth table is given below. Which of the following has this type of truth table ?
A
0
1
0
1
B
0
0
1
1
Y
1
0
0
0
A
XOR gate
B
NOR gate
C
AND gate
D
OR gate
Hard
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>
Assertion
STATEMENT-1 : If output of a AND gate is fed to OR gate, it is called NOR gate.
Reason
STATEMENT-2 : If output of a AND gate is fed to NOT gate, it is called NAND gate.
A
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
B
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
C
Statement-1 is True, Statement-2 is False.
D
Statement-1 is False, Statement-2 is True.
Hard
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For the given combination of gates, if the logic states of inputs A, B, C are as follows
$A=B=C=0$
and
$A=B=1,C=0$
then the logic states of output D are
A
$0,0$
B
$0,1$
C
$1,0$
D
$1,1$
Hard
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>
A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of:
A
each of them increases
B
each of them decreases
C
copper increases and germanium decreases
D
copper decreases and germanium increases.
Hard
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>
A Zener diode is connected to a battery and a load as shown. The currents
$I$
,
$I_{Z}$
and
$I_{L}$
are respectively
A
$12.5mA,5mA,7.5mA$
B
$15mA,7.5mA,7.5mA$
C
$15mA,7.5mA,5mA$
D
$12.5mA,7.5mA,5mA$
Hard
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Which logic gate is represented by the following combination of logic gates:
A
OR
B
NAND
C
AND
D
NOR
Hard
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>
Pure silicon crystal of length
$l(0.1m)$
and area
$A$
(
$10_{−4}m_{2}$
) has the mobility of electrons (
$μ_{e}$
) and holes (
$μ_{h}$
) as
$0.135m_{2}/Vs$
and
$0.048m_{2}/Vs$
, respectively. If the voltage applied across it is
$2V$
and the intrinsic charge concentration is
$n_{i}=1.5×10_{6}m_{−3}$
, then the total current flowing through the crystal is
A
$8.78×10_{−17}A$
B
$6.25×10_{−17}A$
C
$7.89×10_{−17}A$
D
$2.456×10_{−17}A$
Hard
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>