# Solved papers for JEE Main & Advanced Physics Semiconducting Devices JEE PYQ-Semiconducting Devices

### done JEE PYQ-Semiconducting Devices Total Questions - 82

• question_answer1) The energy band gap is maximum in [AIEEE 2002]

A)
metals

B)
superconductors

C)
insulators

D)
semiconductors

• question_answer2) The part of a transistor which is most heavily doped to produce large number of majority carriers is [AIEEE 2002]

A)
emitter

B)
base

C)
collector

D)
can be any of the above three

• question_answer3) Formation  of  covalent  bonds  in compounds exhibits                                               [AIEEE 2002]

A)
wave nature of electron

B)
particle nature of electron

C)
both wave and particle nature of electron

D)
None of the above

• question_answer4) In the middle of the depletion layer of reverse biased p-n junction, the            [AIEEE 2003]

A)
electric field is zero

B)
potential is maximum

C)
electric field is maximum

D)
potential is zero

• question_answer5) Whentransistor is used as an amplifier                                   [AIEEE 2004]

A)
electrons move from base to collector

B)
holes move from emitter to base

C)
electrons move from collector to base

D)
holes move from base to emitter

• question_answer6) For a transistor amplifier in common emitter configuration for load impedance of and the current gain is                            [AIEEE 2004]

A)

B)

C)

D)

• question_answer7) The manifestation of band structure in solids is due to                        [AIEEE 2004]

A)
Heisenberg's uncertainty principle

B)
Pauli's exclusion principle

C)
Bohr's correspondence principle

D)
Boltzmann s law

• question_answer8) Whenjunction diode is forward biased, then,                                         [AIEEE 2004]

A)
the depletion region is reduced and barrier height is increase

B)
the depletion region is widened and barrier height is reduced

C)
both the depiction region and barrier height are reduced

D)
both the depletion region and barrier height are increased

• question_answer9) The electrical conductivity of a semiconductor     increases     when electromagnetic radiation of wavelength shorter than 2480 nm, is incident on it. The band gap for the semiconductor is                      [AIEEE 2005]

A)
1.1 eV

B)
2.5 eV

C)
0.5 eV

D)
0.7 eV

• question_answer10) In a common base amplifier, the phase difference between the input signal voltage and output voltage is                   [AIEEE 2005]

A)

B)

C)
zero

D)

• question_answer11) In a full wave rectifier, circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be [AIEEE 2005]

A)
50 Hz

B)
25 Hz

C)
100 Hz

D)
70.7 Hz

• question_answer12) In a common-base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor (P) will be          [AIEEE 2006]

A)
49

B)
50

C)
51

D)
48

• question_answer13) A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by            [AIEEE 2006]

A)
ionic bonding

B)
covalent bonding

C)
van der Waals' bonding

D)
metallic bonding

• question_answer14) In the following, which one of the diodes is reverse biased?                             [AIEEE 2006]

A)

B)

C)

D)

• question_answer15)  If the lattice constant of this semiconductor is decreased, then which of the following is correct? [AIEEE 2006]

A)
All increase

B)
andincrease, butdecreases

C)
anddecrease, butincreases

D)
Alldecrease

• question_answer16)  If in ajunction diode, a square input signal of 10 V is applied as shown Then, the output signal across  will be                                            [AIEEE 2007]

A)

B)

C)

D)

• question_answer17) Carbon, silicon and germanium have four valence electrons each. At room temperature, which one of the following statements is most appropriate?                                   [AIEEE 2007]

A)
The number of free conduction electrons is significant in C but small in Si and

B)
The number of free conduction electrons is negligibly small in all the three

C)
The number of free electrons for conduction is significant in all the three

D)
The number of free electrons for conduction is significant only inandbut small in C

• question_answer18) A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?                                           [AIEEE 2008]

A)
It is a pnp transistor with R as emitter

B)
It is an npn transistor with R as collector

C)
It is an npn transistor with R as base

D)
It is a pnp transistor with R as collector

• question_answer19)  In the circuit shown, A and B represent two inputs and C represents the output. The circuit represents                      [AIEEE 2008]

A)
NAND gate

B)
OR gate

C)
NOR gate

D)
AND gate

• question_answer20)  A p-n junction (4) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The current (I) in the resistor (R) can be shown by:                                         [AIEEE 2009]

A)

B)

C)

D)

• question_answer21)  The logic circuit shown below has the input waveforms 'A' and 'B' as shown. Pick out the correct output waveform. Output is:                                 [AIEEE 2009]

A)

B)

C)

D)

• question_answer22)  The combination of gates shown below yields                                                 [AIEEE 2010]

A)
NAND gate

B)
OR gate

C)
NOT gate

D)
XOR gate

• question_answer23) The output of an OR gate is connected to both the inputs of a NAND gate. The combination will serve as a:                  [AIEEE 11-05-2011]

A)
NOT gate

B)
NOR gate

C)
AND gate

D)
OR gate

• question_answer24)  Truth table for system of four NAND gates as shown in figure is: [AIEEE 2012]

A)

B)

C)

D)

• question_answer25)  Which logic gate with inputs A and B performs the same operation as that performed by the following circuit?       [JEE ONLINE 07-05-2012]

A)
NAND gate

B)
OR gate

C)
NOR gate

D)
AND gate

• question_answer26)  This question has Statement 1 and Statement 2 Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement 1: A pure semiconductor has negative temperature coefficient of resistance. Statement 2: On raising the temperature, more charge carriers are released into the conduction band.      [JEE ONLINE 12-05-2012]

A)
Statement 1 is false. Statement 2 is true.

B)
Statement 1 is true. Statement 2 is false.

C)
Statement 1 is true. Statement 2 is true, Statement 2 is not a correct explanation of Statement 1.

D)
Statement 1 is true. Statement 2 is true, Statement 2 is the correct explanation of Statement 1.

• question_answer27) Which one of the following is the Boolean expression for NOR gate? [JEE ONLINE 19-05-2012]

A)

B)

C)

D)

• question_answer28)  The figure shows a combination of two NOT gates and a NOR gate. [JEE ONLINE 26-05-2012] The combination is equivalent to a

A)
NAND gate

B)
NOR gate

C)
AND gate

D)
OR gate

• question_answer29) The I − V characteristic of an LED is:                                              [JEE MAIN 2013]

A)

B)

C)

D)

• question_answer30)  Consider two transistors as shown in figure. If 0 `volts corresponds to false and 5Volts correspond to true then the output at corresponds to:           [JEE ONLINE 09-04-2013

A)
A NAND B

B)
A OR B

C)
A AND B

D)
A NOR B

• question_answer31)  Figure shows a circuit in which three identical diodes are used. Each diode has forward resistance of 20  and infinite backward resistance. Resistors . Battery voltage is 6 V. The current though . [JEE ONLINE 22-04-2013]

A)
50 mA

B)
100 mA

C)
60 mA

D)
25 mA

• question_answer32)  A system of four gates is set up as shown. The 'truth table' corresponding to this system is: [JEE ONLINE 23-04-2013]

A)

B)

C)

D)

• question_answer33)  Which of the following circuits correctly represents the following truth table? [JEE ONLINE 25-04-2013]

A)

B)

C)

D)

• question_answer34) The forward biased diode connection is:                                                      [JEE MAIN 2014]

A)

B)

C)

D)

• question_answer35)  Identify the gate and match A, B, Y in bracket to check.                   [JEE ONLINE 09-04-2014]

A)
AND (A = 1, B = 1, Y = 1)

B)
OR (A = 1, B = 1, Y = 0)

C)
NOT (A = 1, B = 1, Y = 1)

D)
XOR (A = 0, B = 0, Y = 0)

• question_answer36) An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to:                             [JEE ONLINE 09-04-2014]

A)
Emitter, base and collector

B)
Base, emitter and collector

C)
Base, collector and emitter

D)
Collector, emitter and base

• question_answer37)  Zener diode is connected to a battery and a load as show below: The currents,  and  are respectively.                          [JEE ONLINE 11-04-2014]

A)
15 mA, 5 mA, 10 mA

B)
15 mA, 7.5 mA, 7.5 mA

C)
12.5 mA, 5 mA, 7.5 mA

D)
12.5 mA, 7.5 mA, 5 mA

• question_answer38) For LEDs to emit light in visible region of electromagnetic light, it should have energy band gap in the range of:                                                         [JEE ONLINE 12-04-2014]

A)
eV to 0.4 eV

B)
0.5 eV to 0.8 eV

C)
0.9 eV to 1.6 eV

D)
1.7 eV to 3.0 eV

• question_answer39)  Given: A and B are input terminals. Logic 1 = > 5 V Logic 0 = < 1 V Which logic gate operation, the above circuit does?                         [JEE ONLINE 19-04-2014]

A)
AND Gate

B)
OR Gate

C)
XOR Gate

D)
NOR Gate

• question_answer40) In an unbiased n-p Junction electrons diffuse from n - region to p - region because:          [JEE ONLINE 10-04-2015]

A)
only electrons move from n to p  holes in p- region and not the vice - versa

B)
holes in p - region attract them

C)
electrons travel across the junction due to potential difference

D)
electron concentration in n - region is more as compared to that in p-region

• question_answer41)  The value of the resistor, needed in the dc voltage regulator circuit shown here, equals : [JEE MAIN 11-04-2015]

A)

B)

C)

D)

• question_answer42)  A 2V battery is connected across AB as shown in the figure. The value of the current supplied by the battery when in one case battery's positive terminal is connected to A and in other case when positive terminal of battery is connected to B will respectively be : [JEE MAIN 11-04-2015]

A)
0.2 A and 0.1 A

B)
0.4 A and 0.2 A

C)
0.1 A and 0.2 A

D)
0.2 A and 0.4 A

• question_answer43) For a common emitter configuration, if and have their usual meanings, the incorrect relationship betweenandis [JEE MAIN - I 3-4-2016]

A)

B)

C)

D)

• question_answer44)  If a, b, c, d are inputs to a gate and x is its output, then as per the following time graph, the gate is                [JEE MAIN - I 3-4-2016] [d] [c] [b] [a] (x)

A)
NAND

B)
NOT

C)
AND

D)
OR

• question_answer45)  Identify the semiconductor devices whose characteristics are given below, in the order , , , :-  e       [JEE MAIN - I 3-4-2016] [a] [b] *-correct-answer-description-* [b] Factual [c] [d]

A)
Zener diode, Solar cell, Simple diode, Light dependent resistance

B)
Simple diode, Zener diode, Solar cell, Light dependent resistance

C)
Zener diode, Simple diode, Light dependent resistance, Solar cell

D)
Solar cell, Light dependent resistance, Zener diode, Simple diode

• question_answer46) An unknown transistor needs to be identified as npn or pnp type. A multi meter, with +ve and -ve terminals, is used to measure resistance between different terminals transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor? [JEE ONLINE 09-04-2016]

A)
+ve terminal 3, -ve terminal 2, resistance high

B)
+ve terminal 2, -ve terminal 3, resistance low

C)
+ve terminal 1, -ve terminal 2, resistance high

D)
+ve terminal 2, -ve terminal 1, resistance high

• question_answer47) An experiment is performed to determine the I - V characteristics of a Zener diode, which has a protective resistance of and maximum power of dissipation rating of 1W. The minimum voltage range of the DC source in the circuit is:                   [JEE ONLINE 09-04-2016]

A)
0. 12V

B)
0. 5V

C)
0. 24

D)
0. 8V

The truth table given in fig. represents:         [JEE ONLINE 09-04-2016]
 A B Y 0 0 0 0 1 1 1 0 1 1 1 1

A)
AND - Gate

B)
OR - Gate

C)
NOR - Gate

D)
NAND - Gate

• question_answer49) A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a common emitter transistor configuration is:                      [JEE ONLINE 10-04-2016]

A)

B)

C)

D)

• question_answer50)  To get an output of 1 from the circuit shown in figure the input must be: [JEE ONLINE 10-04-2016]

A)
a = 1, b = 1, c = 0

B)
a = 1, b = 0, c = 0

C)
a = 0, b = 0, c = 1

D)
a = 1, b = 0, c = 1

• question_answer51) The ratio (R) of output resistance , and the input resistance  in measurements of input and output characteristics of a transistor is typically in the range:   [JEE ONLINE 10-04-2016]

A)

B)

C)

D)

• question_answer52) In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be:                                   [JEE Main 2017]

A)

B)

C)

D)

• question_answer53) What is the conductivity of a semiconductor sample having electron concentration of  hole concentration of  electron mobility of and hole mobility of (Take charge of electron as ) [JEE Online 08-04-2017]

A)

B)

C)

D)

• question_answer54)  The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is :            [JEE Online 08-04-2017]

A)
100

B)
106

C)
10-6

D)
10

• question_answer55) The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is- [JEE Online 09-04-2017]

A)
69 mA

B)
0.69 mA

C)
6.9 mA

D)
9.6 mA

• question_answer56)  The reading of the ammeter for a silicon diode in the given circuit is : [JEE Main Online 08-04-2018]

A)
11.5 mA

B)
13.5 mA

C)
0

D)
15 mA

• question_answer57)  In a common emitter configuration with suitable bias, it is given than ${{R}_{L}}$ is the load resistance and ${{R}_{BE}}$ is small signal dynamic resistance (input side). Then, voltage gain, current gain and power gain are given, respectively, by:          [JEE Online 15-04-2018] $\beta$ is current gain, ${{I}_{B}},{{I}_{C}},{{I}_{E}}$ are respectively base, collector and emitter currents:

A)
$\beta \frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{E}}}{\Delta {{I}_{B}}},{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}}$

B)
${{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}},\beta \frac{{{R}_{L}}}{{{R}_{BE}}}$

C)
${{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}},{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}}$

D)
$\beta \frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}},{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}}$

• question_answer58)  Truth table for the given circuit will be [JEE Online 15-04-2018 (II)]

A)

B)

C)

D)

• question_answer59)  In the given circuit, the current through zener diode is:                [JEE Main Online 16-4-2018]

A)
2.5 mA

B)
3.3 mA

C)
5.5 mA

D)
6.7 mA

• question_answer60) Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is  and their mobility is  then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to: [JEE Main 09-Jan-2019 Morning]

A)

B)

C)

D)

• question_answer61)  Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of  changes by: (assume that the Ge diode has large breakdown voltage) [JEE Main 09-Jan-2019 Evening]

A)
0.4 V

B)
0.6 V

C)
0.8 V

D)
0.2 V

• question_answer62)  To get output 'I' at R, for the given logic gate circuit the input values must be- [JEE Main 10-Jan-2019 Morning]

A)

B)

C)

D)

• question_answer63)  For the circuit shown below, the current through the Zener diode is-    [JEE Main 10-Jan-2019 Evening]

A)
5 mA

B)
zero

C)
14 mA

D)
9 mA

• question_answer64)  The circuit shown below contains two ideal diodes, each with a forward resistance of  If the battery voltage is 6 V, the current through the resistance (in Amperes) is [JEE Main 11-Jan-2019 Evening]

A)
0.030

B)
0.027

C)
0.020

D)
0.036

• question_answer65)  The output of the given logic circuit is-                   [JEE Main 12-Jan-2019 Morning]

A)

B)

C)

D)

• question_answer66)  In the figure, given that supply can vary from 0 to and The minimum base current and the input voltage at which the transistor will go to saturation, will be respectively [JEE Main 12-Jan-2019 Evening]

A)
and 3.5 V

B)
and 3.5V

C)
and 2.8 V

D)
and 2.8 V

• question_answer67)  The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit. The current  through the Zener is : [JEE Main 8-4-2019 Morning]

A)
7 mA

B)
17 mA

C)
10 mA

D)
15mA

• question_answer68)  A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is and What is the minimum base current for  to reach saturation? [JEE Main 8-4-2019 Afternoon]

A)

B)

C)

D)

• question_answer69) An NPN transistor is used in common emitter configuration as an amplifier with load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and  change in the base current of the amplifier. The input resistance and voltage gain are: [JEE Main 9-4-2019 Morning]

A)

B)

C)

D)

• question_answer70)  The logic gate equivalent to the given logic circuit is :-    [JEE Main 9-4-2019 Afternoon]

A)
OR

B)
AND

C)
NOR

D)
NAND

• question_answer71) An npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is and the output load resistance is The common emitter current gain b is :      [JEE Main 10-4-2019 Morning]

A)

B)

C)

D)

• question_answer72)  The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6V and the load resistance is The series resistance of the circuit is If the battery voltage varies from 8V to 16V, what are the minimum and maximum values of the current through Zener diode? [JEE Main 10-4-2019 Afternoon]

A)
0.5 mA ; 6 mA

B)
0.5 mA ; 8.5 mA

C)
1.5 mA ; 8.5 mA

D)
1 mA ; 8.5 mA

• question_answer73)  The truth table for the circuit given in the fig. is: [JEE Main Held on 12-4-2019 Morning]

A)

B)

C)

D)

• question_answer74)  The transfer characteristic curve of a transistor, having input and output resistance  and respectively, is shown in the figure. The Voltage and Power gain, are respectively : [JEE Main Held on 12-4-2019 Morning]

A)

B)

C)

D)

• question_answer75)  Figure shown a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is the maximum Zener current? [JEE Main 12-4-2019 Afternoon]

A)
2.5 mA

B)
3.5 mA

C)
7.5 mA

D)
1.5 mA

• question_answer76) Which of the following gives a reversible operation? [JEE MAIN Held on 07-01-2020 Morning]

A)

B)

C)

D)

• question_answer77)  In the figure, potential difference between A and B is : [JEE MAIN Held on 07-01-2020 Evening]

A)
Zero

B)
5 V

C)
10 V

D)
15 V

• question_answer78)  Boolean relation at the output stage-Y for the Following circuit is: [JEE MAIN Held On 08-01-2020 Morning]

A)
$\overline{A}.\overline{B}$

B)
$A.B$

C)
$A+B$

D)
$\overline{A}+\overline{B}$

• question_answer79)  Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is ___________ [JEE MAIN Held on 09-01-2020 Morning]

• question_answer80)  The current i in the network is [JEE MAIN Held on 09-01-2020 Evening]

A)
0.3A

B)
0.6 A

C)
0 A

D)
0.2 A

• question_answer81)  Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown below at time t = 0. If the charge on capacitors A and B at time t = CR is ${{Q}_{A}}$ and ${{Q}_{B}}$ respectively, then (Here e is the base of natural logarithm) [JEE MAIN Held on 09-01-2020 Evening]

A)
${{Q}_{A}}=\frac{CV}{2},{{Q}_{B}}=\frac{VC}{e}$

B)
${{Q}_{A}}=VC,{{Q}_{B}}=CV$

C)
${{Q}_{A}}=\frac{CV}{e},{{Q}_{B}}=\frac{VC}{2}$

D)
${{Q}_{A}}=VC,{{Q}_{B}}=\frac{VC}{e}$

• question_answer82)  The circuit shown below is working as a $8\text{ }V\text{ }dc$regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is; (considering both zener diodes are identical) ______. [JEE MAIN Held on 09-01-2020 Evening]