1
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
What is the conductivity of a semiconductor sale having electron concentration of $$5 \times {10^{18}}\,\,{m^{ - 3}},$$ hole concentration of $$5 \times {10^{19}}\,\,{m^{ - 3}},$$ electron mobility of 2.0 m2 V$$-$$1 s-1 and hole mobility of 0.01 m2 V$$-$$1 s$$-$$1 ?

(Take charge of electronas 1.6 $$\times$$ 10 $$-$$19 c)
A
1.68 ($$\Omega$$-m)$$-$$1
B
1.83 ($$\Omega$$-m)$$-$$1
C
0.59 ($$\Omega$$-m)$$-$$1
D
1.20 ($$\Omega$$-m)$$-$$1
2
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is :

A
10
B
10$$-$$6
C
106
D
100
3
JEE Main 2017 (Offline)
+4
-1
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be:
A
180°
B
45°
C
90°
D
135°
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
The ratio (R) of output resistance r0, and the input resistance ri in measurements of input and output characteristics of a transistor is typically in the range:
A
R ~ 102 $$-$$ 103
B
R ~ 1 $$-$$ 10
C
R ~ 0.1 $$-$$ 0.01
D
R ~ 0.1 $$-$$ 1.0
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