JEE Main & Advanced Physics Semiconducting Devices Question Bank

done Graphical Questions Total Questions - 30

• question_answer1)
  The temperature (T) dependence of resistivity (r) of a semiconductor is represented by                              [AIIMS 2004]
  A)
                                      done clear
  B)
                              done clear
  C)
                                     done clear
  D)
  done clear
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• question_answer2)
  In a forward biased PN-junction diode, the potential barrier in the depletion region is of the form ?        [KCET 2004]
  A)
                                                 done clear
  B)
                                          done clear
  C)
                                                 done clear
  D)
                                          done clear
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• question_answer3)
  Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current  [MP PET 1996; UPSEAT 2002]
  A)
                               done clear
  B)
                       done clear
  C)
                               done clear
  D)
                       done clear
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• question_answer4)
  If the following input signal is sent through a PN-junction diode, then the output signal across RL will be
  A)
                                           done clear
  B)
                                    done clear
  C)
                                            done clear
  D)
                                   done clear
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• question_answer5)
  The curve between charge density and distance near P-N junction will be
  A)
                                       done clear
  B)
                               done clear
  C)
                                       done clear
  D)
                               done clear
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• question_answer6)
  The resistance of a germanium junction diode whose \[V-I\] is shown in figure is \[({{V}_{k}}=0.3V)\]
  A)
             5 kW done clear
  B)
             0.2 kW done clear
  C)
             2.3 kW done clear
  D)
             \[\left( \frac{10}{2.3} \right)k\Omega \] done clear
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• question_answer7)
  In the half-wave rectifier circuit shown. Which one of the following wave forms is true for \[{{V}_{CD}}\], the output across C and D?
  A)
                           done clear
  B)
                   done clear
  C)
                           done clear
  D)
                   done clear
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• question_answer8)
  The output in the circuit of figure is taken across a capacitor. It is as shown in figure
  A)
                                                   done clear
  B)
                                           done clear
  C)
                          done clear
  D)
                     done clear
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• question_answer9)
  A full wave rectifier circuit along with the input and output voltages is shown in the figure The contribution to output voltage from diode ? 2 is     [MP PMT 2001]
  A)
             A, C                                           done clear
  B)
             B, D done clear
  C)
             B, C                                           done clear
  D)
             A, D done clear
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• question_answer10)
  A source voltage of 8V drives the diode in fig. through a current-limiting resistor of 100 ohm. Then the magnitude of the slope load line on the V-I characteristics of the diode is
  A)
             0.01 done clear
  B)
             100 done clear
  C)
             0.08 done clear
  D)
             12.5 done clear
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• question_answer11)
  The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2volt is applied
  A)
             1 W done clear
  B)
             0.25 W done clear
  C)
             0.5 W done clear
  D)
             5 W done clear
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• question_answer12)
  The given figure shows the wave forms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is                                                                                            [UPSEAT 2002]   (Y)
  A)
             An AND gate                            done clear
  B)
             An OR gate done clear
  C)
             A NAND gate                        done clear
  D)
             An NOT gate done clear
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• question_answer13)
  In a negative logic the following wave form corresponds to the
  A)
             0000000000                            done clear
  B)
             0101101000 done clear
  C)
             1111111111                            done clear
  D)
             1010010111 done clear
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• question_answer14)
  The variation of anode current in a triode corresponding to a change in grid potential at three different values of the plate potential is shown in the diagram. The mutual conductance of the triode is [CPMT 1986, 88]
  A)
             2.5 m mho                                done clear
  B)
             5.0 m mho done clear
  C)
             7.5 m mho                              done clear
  D)
             10.0 m mho done clear
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• question_answer15)
  The point representing the cut off grid voltage on the mutual characteristic of triode is
  A)
             S     done clear
  B)
             R done clear
  C)
             O    done clear
  D)
             P done clear
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• question_answer16)
  For a thermionic emitter (metallic) if J represents the current density and T is its absolute temperature then the correct curve between \[{{\log }_{e}}\frac{J}{{{T}^{2}}}\] and \[\frac{1}{T}\] is
  A)
  done clear
  B)
                               done clear
  C)
                                       done clear
  D)
                               done clear
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• question_answer17)
  If the thermionic current density is J and emitter temperature is T then the curve between \[\frac{J}{{{T}^{2}}}\] and \[\frac{1}{T}\] will be
  A)
                            done clear
  B)
                     done clear
  C)
                            done clear
  D)
                     done clear
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• question_answer18)
  The mutual characteristic of triode is
  A)
                                    done clear
  B)
                            done clear
  C)
                                    done clear
  D)
                             done clear
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• question_answer19)
  The value of amplification factor from the following graph will be
  A)
             10   done clear
  B)
             50 done clear
  C)
             25   done clear
  D)
             40 done clear
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• question_answer20)
  The correct curve between voltage gain \[({{A}_{v}})\] and load resistance \[({{R}_{L}})\] is
  A)
                               done clear
  B)
                       done clear
  C)
                               done clear
  D)
                       done clear
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• question_answer21)
  The curve between the work function of a metal \[({{\varphi }_{o}})\] and its temperature (T) will be
  A)
                               done clear
  B)
                       done clear
  C)
                               done clear
  D)
                       done clear
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• question_answer22)
  The plate characteristic curve of a diode in space charge limited region is as shown in the figure. The slope of curve at point P is 5.0 mA/V. The static plate resistance of diode will be
  A)
             111.1W                                    done clear
  B)
             222.2W done clear
  C)
             333.3W                                    done clear
  D)
             444.4W done clear
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• question_answer23)
  The ratio of thermionic currents (I/I0) for a metal when the temperature is slowly increased \[{{T}_{0}}\] to \[T\] as shown in figure. (I and I0 are currents at T and respectively). Then which one is correct?                                               [Orissa JEE 2002]
  A)
             A     done clear
  B)
             B done clear
  C)
             C     done clear
  D)
             D done clear
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• question_answer24)
  The frequency response curve of RC coupled amplifier is shown in figure. The band width of the amplifier will be
  A)
             \[{{f}_{3}}-{{f}_{2}}\]         done clear
  B)
             \[{{f}_{4}}-{{f}_{1}}\] done clear
  C)
             \[\frac{{{f}_{4}}-{{f}_{2}}}{2}\]                                          done clear
  D)
             \[{{f}_{3}}-{{f}_{1}}\] done clear
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• question_answer25)
  The figure represents variation of triode parameter (m or rp or gm) with the plate current. The correct variation of m and rp are given, respectively by the curves
  A)
             A and B                                    done clear
  B)
             B and C done clear
  C)
             A and C                                    done clear
  D)
             None of the above done clear
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• question_answer26)
  The mutual characteristic curves of a triode are as shown in figure. The cut off voltage for the triode is
  A)
  0 V done clear
  B)
  2 V done clear
  C)
  - 4 V                                         done clear
  D)
  6 V done clear
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• question_answer27)
  For the diode, the characteristic curves are given at different temperature. The relation between the temperatures is  [RPET 1990]           
  A)
             \[{{T}_{1}}={{T}_{2}}={{T}_{3}}\]                                      done clear
  B)
             \[{{T}_{1}}<{{T}_{2}}<{{T}_{3}}\] done clear
  C)
             \[{{T}_{1}}>{{T}_{2}}>{{T}_{3}}\]                                      done clear
  D)
             None of the above done clear
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• question_answer28)
  The output current versus time curve of a rectifier is shown in the figure. The average value of the output current in this case is                                                         [AIIMS 1982]
  A)
             0     done clear
  B)
             i0/p done clear
  C)
             2i0/p                                         done clear
  D)
             \[{{i}_{0}}\] done clear
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• question_answer29)
  Which of the following figures correctly shows the phase relation between the input signal and the output signal of triode amplifier
  A)
             done clear
  B)
             done clear
  C)
             done clear
  D)
             done clear
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• question_answer30)
  In the figure four plate characteristics of a triode at different grid voltage are shown. The difference between successive grid voltage is 1 V. Which curve will have maximum grid voltage and what is its value?
  A)
             A, Vg = + 4 V                          done clear
  B)
             B, Vg = + 4 V done clear
  C)
             A, Vg = 0                                  done clear
  D)
             D, Vg = 0 done clear
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