Q.1.
Choose the only false statement from the following.
-
9%
In conductors, the valence and conduction bands overlap.
-
21%
Substances with an energy gap of the order of 10 eV are insulators
-
42%
The resistivity of a semiconductor increases with increases in temperature.
-
27%
The conductivity of a semiconductor increases with increases in temperature
Q.2.
In a transistor
-
30%
there is 1 p-n junction
-
63%
there are 2 p-n junctions
-
4%
there are 3 p-n junctions
-
4%
there are 4 p-n junctions
Q.3.
In a semiconducting material, the mobilities of electrons and holes are $\mu _e$ and $\mu _h$ respectively. Which of the following is true?
-
41%
$\mu _e > $\mu _h$
-
27%
$\mu _e < $\mu _h$
-
14%
$\mu _e = $\mu _h$
-
18%
$\mu _e < 0$; $\mu _h > 0$
Q.4.
In a p-n junction photocell, the value of the photo electromotive force produced by monochromatic light is proportional to
-
27%
the barrier voltage at the p-n junction.
-
36%
the intensity of the light falling on the cell.
-
27%
the frequency of the light falling on the cell.
-
9%
the voltage applied at the p-n junction.
Q.5.
The amplifier has voltage gain =1000, the voltage gain (in dB) is
-
14%
30 dB
-
29%
60 dB
-
29%
3 dB
-
29%
20 dB
Q.6.
Which of the following is not a process involved in the fabrication of IC?
-
40%
Polymerisation
-
35%
Diffusion
-
15%
Photolithography
-
10%
Metallisation
Q.7.
In the depletion layer of an unbiased p-n junction junction diode , there are
-
24%
holes
-
19%
Mobile ions
-
19%
electrons
-
38%
immobile ions
Q.8.
The current in the circuit will be
-
12%
5/40 A
-
62%
5/50 A
-
19%
5/10 A
-
6%
5/20 A
Q.9.
we have below circuit given
For what values of A and B, the output Y will not be 1
-
53%
0, 0
-
16%
0, 1
-
16%
1,0
-
16%
1,1
Q.10.
You are required to choose the correct one out of the given five responses and mark it as
(a) If both assertion and reason are true and reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not correct explanation of the assertion.
(c) If assertion is true, but reason is false.
(d) If both assertion and reason are false.
(e) If reason is true but assertion is false
Assertion: In a transistor, the base is made thin.
Reason: A thin base makes the transistor stable
-
50%
a
-
8%
b
-
42%
c
-
0%
d
-
0%
e
Q.11.
You are required to choose the correct one out of the given five responses and mark it as
(a) If both assertion and reason are true and reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not correct explanation of the assertion.
(c) If assertion is true, but reason is false.
(d) If both assertion and reason are false.
(e) If reason is true but assertion is false
Assertion: In a common-emitter amplifier, the load resistance of the output circuit is 1000 times the load resistance of the input circuit. If $\alpha = 0.98$, then voltage gain is $49 \times 10^3$
Reason: $\alpha = \frac {\beta}{1 + \beta}$ (symbols have their usual meaning)
-
36%
a
-
27%
b
-
18%
c
-
18%
d
-
0%
e
Q.12.
You are required to choose the correct one out of the given five responses and mark it a
(a) If both assertion and reason are true and reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not correct explanation of the assertion.
(c) If assertion is true, but reason is false.
(d) If both assertion and reason are false.
(e) If reason is true but assertion is false
Assertion: NOT gate is also called inverter circuit.
Reason: NOT gate inverts the input
-
60%
a
-
10%
b
-
20%
c
-
10%
d
-
0%
e
Q.13.
You are required to choose the correct one out of the given five responses and mark it a
(a) If both assertion and reason are true and reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not correct explanation of the assertion.
(c) If assertion is true, but reason is false.
(d) If both assertion and reason are false.
(e) If reason is true but assertion is false
Assertion: germanium is preferred over silicon for making semiconductor devices.
Reason: The energy gap for germanium is smaller than the energy gap of silicon
-
55%
a
-
9%
b
-
0%
c
-
18%
d
-
18%
e
Q.14.
Paragraph Question
In the p-n-p transistor circuit, the collector current is 10 mA. If 90% of the holes reach the collector. Find the emitter current.
-
7%
9 mA
-
67%
11 mA
-
13%
12 mA
-
13%
10.9 mA
Q.15.
What is the base current?
-
46%
1 mA
-
23%
2 mA
-
15%
.1 mA
-
15%
None of these
Q.16.
A semiconductor having electron and hole mobilities $\mu _n$ and $\mu _p$ respectively, if its intrinsic carrier density is $n_i$ , then what will be the value of hole concentration P for which the conductivity will be minimum at a given temperature?
-
69%
$n_i \sqrt {\frac {\mu _n}{\mu _p}}$
-
15%
$n_i \sqrt {\frac {\mu _p}{\mu _n}}$
-
8%
$\frac {1}{n_i} \sqrt {\frac {\mu _p}{\mu _n}}$
-
8%
$ \sqrt {\frac {n_i \mu _p}{\mu _n}}$
Q.17.
The coordination number for a bcc crystal is
-
14%
4
-
43%
8
-
36%
12
-
7%
6
Q.18.
which of the following is an amorphous solid?
-
43%
glass
-
21%
diamond
-
29%
Salt
-
7%
Sugar
Q.19.
Match the column
-
29%
p -> iv, q ->i, r -> ii , s->iii
-
29%
p -> iii, q ->i, r -> iv , s->ii
-
18%
p -> iv, q ->ii, r -> i , s->iii
-
24%
p -> iv, q ->i, r -> iii , s->ii