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
  done clear
  B)
  superconductors
  done clear
  C)
  insulators
  done clear
  D)
  semiconductors
  done clear
  View Answer play_arrow

• question_answer2) The part of a transistor which is most heavily doped to produce large number of majority carriers is [AIEEE 2002]
  A)
  emitter
  done clear
  B)
  base
  done clear
  C)
  collector          
  done clear
  D)
  can be any of the above three
  done clear
  View Answer play_arrow

• question_answer3) Formation  of  covalent  bonds  in compounds exhibits                                               [AIEEE 2002]
  A)
  wave nature of electron
  done clear
  B)
  particle nature of electron
  done clear
  C)
  both wave and particle nature of electron
  done clear
  D)
  None of the above
  done clear
  View Answer play_arrow

• question_answer4) In the middle of the depletion layer of reverse biased p-n junction, the            [AIEEE 2003]
  A)
  electric field is zero      
  done clear
  B)
  potential is maximum
  done clear
  C)
  electric field is maximum
  done clear
  D)
  potential is zero
  done clear
  View Answer play_arrow

• question_answer5) Whentransistor is used as an amplifier                                   [AIEEE 2004]
  A)
  electrons move from base to collector
  done clear
  B)
  holes move from emitter to base
  done clear
  C)
  electrons move from collector to base
  done clear
  D)
  holes move from base to emitter
  done clear
  View Answer play_arrow

• question_answer6) For a transistor amplifier in common emitter configuration for load impedance of and the current gain is                            [AIEEE 2004]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer7) The manifestation of band structure in solids is due to                        [AIEEE 2004]
  A)
  Heisenberg's uncertainty principle
  done clear
  B)
  Pauli's exclusion principle
  done clear
  C)
  Bohr's correspondence principle
  done clear
  D)
  Boltzmann’ s law
  done clear
  View Answer play_arrow

• question_answer8) Whenjunction diode is forward biased, then,                                         [AIEEE 2004]
  A)
  the depletion region is reduced and barrier height is increase
  done clear
  B)
  the depletion region is widened and barrier height is reduced
  done clear
  C)
  both the depiction region and barrier height are reduced
  done clear
  D)
  both the depletion region and barrier height are increased
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  2.5 eV
  done clear
  C)
  0.5 eV
  done clear
  D)
  0.7 eV
  done clear
  View Answer play_arrow

• question_answer10) In a common base amplifier, the phase difference between the input signal voltage and output voltage is                   [AIEEE 2005]
  A)
  
  done clear
  B)
       
  done clear
  C)
  zero
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  25 Hz
  done clear
  C)
  100 Hz
  done clear
  D)
  70.7 Hz 
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  50
  done clear
  C)
  51
  done clear
  D)
  48
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  covalent bonding
  done clear
  C)
  van der Waals' bonding
  done clear
  D)
  metallic bonding
  done clear
  View Answer play_arrow

• question_answer14) In the following, which one of the diodes is reverse biased?                             [AIEEE 2006]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer15) 

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

  A)
  All increase
  done clear
  B)
  andincrease, butdecreases
  done clear
  C)
  anddecrease, butincreases
  done clear
  D)
  Alldecrease
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  The number of free conduction electrons is negligibly small in all the three
  done clear
  C)
  The number of free electrons for conduction is significant in all the three
  done clear
  D)
  The number of free electrons for conduction is significant only inandbut small in C
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  It is an npn transistor with R as collector
  done clear
  C)
  It is an npn transistor with R as base
  done clear
  D)
  It is a pnp transistor with R as collector
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  OR gate
  done clear
  C)
  NOR gate
  done clear
  D)
  AND gate
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer22) 

  The combination of gates shown below yields                                                 [AIEEE 2010]

  A)
  NAND gate
  done clear
  B)
  OR gate
  done clear
  C)
  NOT gate
  done clear
  D)
  XOR gate
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  NOR gate
  done clear
  C)
  AND gate
  done clear
  D)
  OR gate
  done clear
  View Answer play_arrow

• question_answer24) 

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

  A)
  
  done clear
  B)
  
  done clear
  C)
             
  done clear
  D)
             
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  OR gate
  done clear
  C)
  NOR gate
  done clear
  D)
  AND gate
  done clear
  View Answer play_arrow

• 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.
  done clear
  B)
  Statement 1 is true. Statement 2 is false.
  done clear
  C)
  Statement 1 is true. Statement 2 is true, Statement 2 is not a correct explanation of Statement 1.
  done clear
  D)
  Statement 1 is true. Statement 2 is true, Statement 2 is the correct explanation of Statement 1.
  done clear
  View Answer play_arrow

• question_answer27) Which one of the following is the Boolean expression for NOR gate? [JEE ONLINE 19-05-2012]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  NOR gate
  done clear
  C)
  AND gate
  done clear
  D)
  OR gate
  done clear
  View Answer play_arrow

• question_answer29) The I − V characteristic of an LED is:                                              [JEE MAIN 2013]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  A OR B
  done clear
  C)
              A AND B
  done clear
  D)
  A NOR B        
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  100 mA
  done clear
  C)
               60 mA
  done clear
  D)
  25 mA
  done clear
  View Answer play_arrow

• 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)
             
  done clear
  B)
  
  done clear
  C)
             
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer33) 

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

  A)
               
  done clear
  B)
             
  done clear
  C)
                
  done clear
  D)
               
  done clear
  View Answer play_arrow

• question_answer34) The forward biased diode connection is:                                                      [JEE MAIN 2014]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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)
  done clear
  B)
  OR (A = 1, B = 1, Y = 0)
  done clear
  C)
  NOT (A = 1, B = 1, Y = 1)
  done clear
  D)
  XOR (A = 0, B = 0, Y = 0)
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  Base, emitter and collector
  done clear
  C)
  Base, collector and emitter
  done clear
  D)
  Collector, emitter and base
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  15 mA, 7.5 mA, 7.5 mA
  done clear
  C)
  12.5 mA, 5 mA, 7.5 mA
  done clear
  D)
  12.5 mA, 7.5 mA, 5 mA
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  0.5 eV to 0.8 eV
  done clear
  C)
  0.9 eV to 1.6 eV
  done clear
  D)
  1.7 eV to 3.0 eV
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  OR Gate
  done clear
  C)
  XOR Gate
  done clear
  D)
  NOR Gate
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  holes in p - region attract them
  done clear
  C)
  electrons travel across the junction due to potential difference
  done clear
  D)
  electron concentration in n - region is more as compared to that in p-region
  done clear
  View Answer play_arrow

• question_answer41) 

  The value of the resistor, needed in the dc voltage regulator circuit shown here, equals :

  [JEE MAIN 11-04-2015]

  A)
                                           
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
   
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  0.4 A and 0.2 A
  done clear
  C)
  0.1 A and 0.2 A
  done clear
  D)
  0.2 A and 0.4 A
  done clear
  View Answer play_arrow

• question_answer43) For a common emitter configuration, if and have their usual meanings, the incorrect relationship betweenandis [JEE MAIN - I 3-4-2016]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  NOT
  done clear
  C)
  AND
  done clear
  D)
  OR
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  Simple diode, Zener diode, Solar cell, Light dependent resistance
  done clear
  C)
  Zener diode, Simple diode, Light dependent resistance, Solar cell
  done clear
  D)
  Solar cell, Light dependent resistance, Zener diode, Simple diode
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  +ve terminal 2, -ve terminal 3, resistance low
  done clear
  C)
  +ve terminal 1, -ve terminal 2, resistance high
  done clear
  D)
  +ve terminal 2, -ve terminal 1, resistance high
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  0. 5V
  done clear
  C)
  0. 24
  done clear
  D)
  0. 8V
  done clear
  View Answer play_arrow

• question_answer48) 

  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
  done clear
  B)
  OR - Gate
  done clear
  C)
  NOR - Gate
  done clear
  D)
  NAND - Gate
  done clear
  View Answer play_arrow

• 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)
               
  done clear
  B)
             
  done clear
  C)
                       
  done clear
  D)
             
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  a = 1, b = 0, c = 0
  done clear
  C)
  a = 0, b = 0, c = 1
  done clear
  D)
  a = 1, b = 0, c = 1
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
             
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
   
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  106
  done clear
  C)
  10-6
  done clear
  D)
  10
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  0.69 mA
  done clear
  C)
  6.9 mA
  done clear
  D)
  9.6 mA
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  13.5 mA
  done clear
  C)
  0
  done clear
  D)
  15 mA
  done clear
  View Answer play_arrow

• 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)
  \[\beta \frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{E}}}{\Delta {{I}_{B}}},{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}}\]
  done clear
  B)
  \[{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}},\beta \frac{{{R}_{L}}}{{{R}_{BE}}}\]
  done clear
  C)
  \[{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}},{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}}\]
  done clear
  D)
  \[\beta \frac{{{R}_{L}}}{{{R}_{BE}}},\frac{\Delta {{I}_{C}}}{\Delta {{I}_{B}}},{{\beta }^{2}}\frac{{{R}_{L}}}{{{R}_{BE}}}\]
  done clear
  View Answer play_arrow

• question_answer58) 

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

  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer59) 

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

  A)
  2.5 mA
  done clear
  B)
  3.3 mA
  done clear
  C)
  5.5 mA
  done clear
  D)
  6.7 mA
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
   
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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 
  done clear
  B)
  0.6 V
  done clear
  C)
  0.8 V
  done clear
  D)
  0.2 V
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer63) 

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

  A)
  5 mA
  done clear
  B)
  zero
  done clear
  C)
  14 mA
  done clear
  D)
  9 mA
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  0.027
  done clear
  C)
  0.020
  done clear
  D)
  0.036
  done clear
  View Answer play_arrow

• question_answer65) 

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

  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  and 3.5V
  done clear
  C)
   and 2.8 V
  done clear
  D)
   and 2.8 V
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  17 mA
  done clear
  C)
  10 mA
  done clear
  D)
  15mA
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer70) 

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

  A)
  OR
  done clear
  B)
  AND
  done clear
  C)
  NOR
  done clear
  D)
  NAND
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  0.5 mA ; 8.5 mA
  done clear
  C)
  1.5 mA ; 8.5 mA
  done clear
  D)
  1 mA ; 8.5 mA
  done clear
  View Answer play_arrow

• question_answer73) 

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

  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• 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
  done clear
  B)
  3.5 mA
  done clear
  C)
  7.5 mA
  done clear
  D)
  1.5 mA
  done clear
  View Answer play_arrow

• question_answer76) Which of the following gives a reversible operation? [JEE MAIN Held on 07-01-2020 Morning]
  A)
  
  done clear
  B)
             
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer77) 

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

  A)
  Zero
  done clear
  B)
  5 V
  done clear
  C)
  10 V
  done clear
  D)
  15 V
  done clear
  View Answer play_arrow

• question_answer78) 

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

  A)
  \[\overline{A}.\overline{B}\]       
  done clear
  B)
  \[A.B\]
  done clear
  C)
  \[A+B\]
  done clear
  D)
  \[\overline{A}+\overline{B}\]
  done clear
  View Answer play_arrow

• 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]

  View Answer play_arrow

• question_answer80) 

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

  A)
  0.3A    
  done clear
  B)
  0.6 A
  done clear
  C)
  0 A
  done clear
  D)
  0.2 A
  done clear
  View Answer play_arrow

• 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)
  \[{{Q}_{A}}=\frac{CV}{2},{{Q}_{B}}=\frac{VC}{e}\]
  done clear
  B)
  \[{{Q}_{A}}=VC,{{Q}_{B}}=CV\]
  done clear
  C)
  \[{{Q}_{A}}=\frac{CV}{e},{{Q}_{B}}=\frac{VC}{2}\]
  done clear
  D)
  \[{{Q}_{A}}=VC,{{Q}_{B}}=\frac{VC}{e}\]
  done clear
  View Answer play_arrow

• 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]

  View Answer play_arrow