JEE Questions for Physics Semiconductor Devices Quiz 9 - MCQExams.com

When source voltage increases in a zener diode, which of these current remians approximately constant ?
  • Series current
  • Zener current
  • Load current
  • Total current
The device associated with voltage controlled capacitance is ___________ .
  • Light emitting diode
  • Photo diode
  • Varactor diode
  • Zener diode
For normal operation of the transistor, the collector diode has to be __________ .
  • Forward biased
  • Reverse biased
  • Non conducting
  • Operating in breakdown region
Most of the electrons in the base of N-P-N transistor flow
  • Out of the base lead
  • Into the collector
  • Into the emitter
  • Into the base supply
Assertion : Intrinsic charge carries are thermally generated
Reason : Their availability can be easily controlled
  • If both Assertion and Reason are true and reason is the correct explanation of assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : Impurity atoms for silicon is selected from third or fourth group
Reason : These Impurity atoms have same size as that of Si
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : Photodiode are operated in reverse bias
Reason : In reverse bias fractional change in minority charge carrier is more
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : The resistivity of a semi-conductor decreases with temperature
Reason : At higher temperature more co-valent bond breaks
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : NAND (or NOR) gates are called digital building blocks
Reason : The different combination of NAND (or NOR) gates can produce all the basic or complicated gates.
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : The colour of light emitted by depends on its forward bias.
Reason : The forward biasing of PN junction diode will increase the width of depletion layer
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : The ionization energy of isolated phosphorous is very large
Reason : The ionization energy of phosphorous in lattice is very small
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : Mostly transistor are used in common emitter configuration
Reason : Common emitter configuration provide more current gain and small voltage gain
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Assertion : A transistor amplifier circuit in common emitter configuration has low input impednce
Reason : Base - emitter junction is forward biased
  • If both Assertion and Reason are true and reason is the correct explanation of assertion.
  • If both Assertion and Reason are true but Reason is not the correct explanation of assertion.
  • If Assertion is true but Reason is false
  • If both assertion and reason are false
Which of the following logic gate will have output 1 ?

  • Physics-Semiconductor Devices-87739.png
  • 2)
    Physics-Semiconductor Devices-87740.png

  • Physics-Semiconductor Devices-87741.png

  • Physics-Semiconductor Devices-87742.png
The symbol respresents :
Physics-Semiconductor Devices-87743.png
  • NOT gate
  • OR gate
  • AND gate
  • NOR gate
The logic circuit shown in the figure, is the equivalent diagram of which logic gate ?
Physics-Semiconductor Devices-87744.png
  • OR gate
  • NAND gate
  • AND gate
  • NOR gate
For the given circuit of ideal P.N junction diode which is correct ?
Physics-Semiconductor Devices-87745.png
  • In F.B, the voltage across R is V
  • In R.B, the voltage across R is V
  • In F.B, the voltage across R is –V
  • In R.B the voltage across R is –V
In the figure, the input is across A and C and output is across B and D. The output is
Physics-Semiconductor Devices-87746.png
  • Same as input
  • Halfwave rectified
  • Fullwave rectified
  • Zero
Assuming that the junction diode is ideal, the current through the diode is ___________ mA
Physics-Semiconductor Devices-87747.png
  • 1
  • 10
  • 20
  • 30
The combinations of NAND gates shown here under are equivqlent to :
Physics-Semiconductor Devices-87748.png
  • OR gate and NOT gate
  • AND gate and OR gate
  • AND gate and NOT gate
  • OR gate and AND gate
The expression of Y in the following circuit is :
Physics-Semiconductor Devices-87749.png
  • AB + CD
  • A + BCD
  • A + B + C + D
  • A.B.C.D
Which of the following figure represents an ideal diode characteristics ?

  • Physics-Semiconductor Devices-87750.png
  • 2)
    Physics-Semiconductor Devices-87751.png

  • Physics-Semiconductor Devices-87752.png

  • Physics-Semiconductor Devices-87753.png
What is type of material, for the energy band diagram shown in the figure ?
Physics-Semiconductor Devices-87754.png
  • N - type semi-conductor
  • P - type semi-conductor
  • Insulator
  • Intrinsic semi-conductor
The bolean equation for the circuit is
Physics-Semiconductor Devices-87755.png

  • Physics-Semiconductor Devices-87756.png
  • 2)
    Physics-Semiconductor Devices-87757.png

  • Physics-Semiconductor Devices-87758.png

  • Physics-Semiconductor Devices-87759.png
In the circuit below A and B represnts two inputs and C represents output. The circuit represents ___________ .
Physics-Semiconductor Devices-87761.png
  • NOR gate
  • NAND gate
  • AND gate
  • OR gate
The current flowing through 10Ω resistor in the circuit shown in the figure is
  • 50mA
  • 20mA
  • 40mA
  • 80mA
For the given circuit of ideal P.N junction diode which is correct ?
Physics-Semiconductor Devices-87762.png
  • In F.B, the voltage across R is V
  • In R.B, the voltage across R is V
  • In F.B, the voltage across R is –V
  • In R.B the voltage across R is –V
For a crystal system, a = b = c, α = β = γ ≠ 90°, the system is
  • Tetragonal system
  • Cubic system
  • Orthorhombic system
  • Rhombohedral system
The temperature coefficient of resistance of a conductor is
  • Positive always
  • Negative always
  • Zero
  • Infinite
Potassium has a bcc structure with nearest neighbor distance 4.525 Å. Its molecular weight is 39. Its density in kg/m3 is
  • 900
  • 494
  • 602
  • 802
Metallic solids are always opaque because
  • Solids effect the incident light
  • Incident light is readily absorbed by the free electrons in a metal
  • Incident light is scattered by solid molecules
  • Energy band traps the incident light
In which of the following ionic bond is present?
  • NaCl
  • Ar
  • Si
  • Ge
Which of the following materials is non-crystalline?
  • Copper
  • Sodium chloride
  • Wood
  • Diamond
The coordination number of Cu is
  • 1
  • 6
  • 8
  • 12
Which one of the following is the weakest kind of bonding in solids?
  • Ionic
  • Metallic
  • Van der Waal's
  • Covalent
Absorption of X—Rays is maximum in which of the following material sheet of same thickness
  • Cu
  • Au
  • Be
  • Pb
What is the coordination number of sodium ions in the case of sodium chloride structure?
  • 6
  • 8
  • 4
  • 12
The distance between the body centred atom and a corner atom in sodium (a = 4.225 Å) is
  • 3.66 Å
  • 3.17 Å
  • 2.99 Å
  • 2.54 Å
A solid that transmits light in visible region and has a very low melting point possesses
  • Metallic bonding
  • Ionic bonding
  • Covalent bonding
  • van der Waal's bonding
Atomic radius of fcc is

  • Physics-Semiconductor Devices-87769.png
  • 2)
    Physics-Semiconductor Devices-87770.png

  • Physics-Semiconductor Devices-87771.png

  • Physics-Semiconductor Devices-87772.png
A solid reflects incident light and it\'s electrical conductivity decreases with temperature. The binding in this solids
  • Ionic
  • Covalent
  • Metallic
  • Molecular
The laptop PC\'s modern electronic watches and calculators use the following for display
  • Single crystal
  • Poly crystal
  • Liquid crystal
  • Semiconductors
The nearest distance between two atoms in case of a bcc lattice is equal to

  • Physics-Semiconductor Devices-87774.png
  • 2)
    Physics-Semiconductor Devices-87775.png

  • Physics-Semiconductor Devices-87776.png

  • Physics-Semiconductor Devices-87777.png
What is the net force on a Cl– placed at the centre of the bcc structure of CsCl?
Physics-Semiconductor Devices-87779.png
  • Zero
  • 2)
    Physics-Semiconductor Devices-87780.png

  • Physics-Semiconductor Devices-87781.png
  • Data is incomplete
The term liquid crystal refers to a state that is intermediate between
  • Crystalline solid and amorphous liquid
  • Crystalline solid and vapour
  • Amorphous liquid and its vapour
  • A crystal immersed in a liquid
A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. An identical reverse bias is applied across the diodes
  • The reverse current in Ge is larger than that in Si
  • The reverse current in Si is larger than that in Ge
  • The reverse current in identical in the two diodes
  • The relative magnitude of the reverse currents cannot be determined from the given data only
Which of the following is a dichroic crystal?
  • Mica
  • Selenite
  • Quartz
  • Tourmaline
The conduction band in a solid is partially filled at 0 K. The solid sample is a
  • Conductor
  • Semiconductor
  • Insulator
  • None of these
The crystal structure can be studied by using
  • UV rays
  • X-rays
  • IR radiation
  • Microwaves
The majority charge carriers in P-type semiconductor are
  • Electrons
  • Protons
  • Holes
  • Neutrons
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