JEE Main & Advanced Physics Semiconducting Devices Question Bank

done Assertion and Reason Total Questions - 31

• question_answer1)
  Assertion             :       The logic gate NOT can be built using diode. Reason                 :   The output voltage and the input voltage of the diode have 180° phase difference. [AIIMS 2005]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer2)
  Assertion             :       The number of electrons in a P-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature. Reason                 :       It is due to law of mass action. [AIIMS 2005]                                                                                                             
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer3)
  Assertion             :       In a common emitter transistor amplifier the input current is much less than the output current. Reason                 :       The common emitter transistor amplifier has very high input impedance.     [AIIMS 2005]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer4)
  Assertion             :       A transistor amplifier in common emitter configuration has a low input impedence. Reason                 :       The base to emitter region is forward biased.  [AIIMS 2004]     
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer5)
  Assertion             :       The resistivity of a semiconductor increases with temperature. Reason                 :       The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing it's resistivity.     [AIIMS 2003]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer6)
  Assertion             :       If the temperature of a semiconductor is increased then it's resistance decreases. Reason                 :   The energy gap between conduction band and valence band is very small        [AIIMS 1997]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer7)
  Assertion             :       The temperature coefficient of resistance is positive for metals and negative for P-type semiconductor.   Reason                 :       The effective charge carriers in metals are negatively charged whereas in P-type semiconductor they are positively charged. [AIIMS 1996]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer8)
  Assertion             :       Electron has higher mobility than hole in a semiconductor. Reason                 :       Mass of electron is less than the mass of hole.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer9)
  Assertion             :       An N-type semiconductor has a large number of electrons but still it is electrically neutral. Reason                 :       An N-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer10)
  Assertion             :       The crystalline solids have a sharp melting point. Reason                 :       All the bonds between the atoms or molecules of a crystalline solids are equally strong, that they get broken at the same temperature.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer11)
  Assertion             :       Silicon is preferred over germanium for making semiconductor devices. Reason                 :       The energy gap for germanium is more than the energy gap of silicon.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer12)
  Assertion             :       We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals. Reason                 :       The current through the PN junction is not same in forward and reversed bias.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer13)
  Assertion             :       Semiconductors do not Obey's Ohm's law.  Reason                 :   Current is determined by the rate of flow of charge carriers.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer14)
  Assertion             :       Two P-N junction diodes placed back to back, will work as a NPN transistor. Reason                 :       The P-region of two PN junction diodes back to back will form the base of NPN transistor.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer15)
  Assertion             :       In transistor common emitter mode as an amplifier is preferred over common base mode. Reason                 :       In common emitter mode the input signal is connected in series with the voltage applied to the base emitter function.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer16)
  Assertion             :       The dominant mechanism for motion of charge carriers in forward and reverse biased silicon P-N junction are drift in both forward and reverse bias.  Reason                 :       In reverse biasing, no current flow through the junction.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer17)
  Assertion             :       A transistor is a voltage-operating device. Reason                 :       Base current is greater than the collector current.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer18)
  Assertion             :       NAND or NOR gates are called digital building blocks. Reason                 :       The repeated use of NAND (or NOR) gates can produce all the basic or complicated gates.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer19)
  Assertion             :       At 0 K Germanium is a superconductor.  Reason                 :       At 0 K Germanium offers zero resistance.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer20)
  Assertion             :       Base in a transistor is made very thin as compared to collector and emitter regions.                 Reason                 :       Due to thin base power gain and voltage gain is obtained by a transistor.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer21)
  Assertion             :       The current gain in common base circuit is always less than one. Reason                 :       At constant collector voltage the change in collector current is more than the change in emitter current.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer22)
  Assertion             :       V-i characteristic of P-N junction diode is same as that of any other conductor. Reason                 :       P-N junction diode behave as conductor at room temperature.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer23)
  Assertion             :       Zener diode works on a principle of breakdown voltage. Reason                 :       Current increases suddenly after breakdown voltage.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer24)
  Assertion             :       NOT gate is also called inverter circuit. Reason                 :       NOT gate inverts the input order.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer25)
  Assertion             :       In vacuum tubes (valves), vacuum is necessary for the movement of electrons between electrodes otherwise electrons collide with air particle and loses their energy. Reason                 :       In semiconductors devices, external heating or vacuum is not required.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer26)
  Assertion             :       The following circuit represents 'OR' gate Reason                 :       For the above circuit \[Y=\bar{X}=\overline{\overline{A+B}}=A+B\]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer27)
  Assertion             :       A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm. Reason                 :       A PN photodiode detect wavelength l if \[\frac{hc}{\lambda }>{{E}_{g}}\].
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer28)
  Assertion             :       29 is the equivalent decimal number of binary number 11101. Reason                 :       (11101)2 = (1 ´ 24 + 1 ´ 23 + 1 ´ 22 + 0 ´ 21 + 1 ´ 20 )10 = (16 + 8 + 4 + 0 + 1)10 = (29)10
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer29)
  Assertion             :       When PN-junction is forward biased then motion of charge carriers at junction is due to diffusion. In reverse biasing. The cause of motion of charge is drifting. Reason                 :       In the following circuit emitter is reverse biased and collector is forward biased.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer30)
  Assertion             :       De-morgan's theorem \[\overline{A+B}=\bar{A}\cdot \bar{B}\] may be explained by the following circuit Reason                 :       In the following circuit, for output inputs ABC are 101
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer31)
  Assertion             :       In the following circuit the potential drop across the resistance is zero.             Reason     :       The given resistance has low value.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow