CBSE Questions for Class 12 Medical Physics Semiconductor Electronics: Materials, Devices And Simple Circuits Quiz 4 - MCQExams.com

The order of size of an IC is:
  • $$10^{-3} - 10^{-1} m$$
  • $$10^{1} - 10^{3} m$$
  • $$10^{-1} - 10^{1} m$$
  • $$10^{-9} - 10^{-6} m$$
Which of the following is a characteristic of analog ICs?
  • They can be used for analog input and output signals only.
  • They cannot be used for analog input and output signals.
  • Input signal is analog but output signal is digital.
  • Output signal is analog but input signal is digital.
Which of the following is not a type of an IC?
  • Analog IC
  • Digital IC
  • Mixed IC
  • Compound IC
At breakdown voltage, the rate of creation of hole-electron pairs is _____  leading to the _______  in current. 
  • increased, decrease
  • increased, increase
  • decreased, increase
  • decreased, decrease
Fill in the blank.
In a Ruby laser, the colour of laser light is due to ________ atom.
  • Oxygen
  • Aluminium
  • Xenon
  • Chromium
The inputs to the digital circuit are shown below. The output Y is.

574249.PNG
  • $$A+B+\bar{C}$$
  • $$(A+B)\bar{C}$$
  • $$\bar{A}+\bar{B}+\bar{C}$$
  • $$\bar{A}+\bar{B}+{C}$$
In which of the following statements, the obtained impure semiconductor is of p-type?
  • Germanium is doped with bismuth
  • Silicon is doped with antimony
  • Germanium is doped with gallium
  • Silicon is doped with phosphorus
In intrinsic semiconductors:
  • $$n>p$$
  • $$p>n$$
  • $$n=p$$
  • $$n=0$$
Which of these is the best description of a Zener diode ?
  • It is a constant voltage device.
  • It operates in the reverse region.
  • It is a constant current device.
  • It works in forward region.
Which of the following is an example of a direct band gap intrinsic semiconductor?
  • Silicon
  • Germanium
  • Gallium Arsenide
  • none of these
Which of the following statement(s) is/are true about holes?
  • They flow from positive terminal to negative terminal
  • They flow from negative terminal to positive terminal
  • They do not flow
  • None of these
In N-type semiconductors, holes are:
  • majority carriers
  • minority carriers
  • absent
  • none of these
In intrinsic semiconductors,:
  • holes or electrons are supplied by a foreign atom acting as an impurity
  • holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band
  • has high amount of impurities
  • none of the above
An intrinsic semiconductor is:
  • undoped
  • doped
  • can be undoped or doped
  • semi-doped
A semi conductor device with both active and passive electronic elements diffused into a silicon water to form a functional circuit is called.
  • Thin-film circuit
  • Integrated circuit
  • Hybrid-circuit
  • Thick-film circuit
In p-type semiconductors, holes are:
  • majority carriers
  • minority carriers
  • absent
  • none of the above
Diode can work as
  • Modulator
  • Demodulator
  • Rectifier
  • Amplifier
What will be the input of $$A$$ and $$B$$ for Boolean expression
597538.png
  • $$0,0$$
  • $$0,1$$
  • $$1,0$$
  • $$1,1$$
In a transistor the base is
  • an insulator
  • a conductor of low resistance
  • a conductor of high resistance
  • an extrinsic semiconductor
 A semiconductor device is connected in a series circuit with a battery and resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be
  • a p-type semiconductor
  • an n-type semiconductor
  • a p-n junction
  • an intrinsic semiconductor
When an impurity is doped into semiconductor, the conductivity of the semiconductor 
  • increases
  • decreases
  • remains same
  • becomes zero
Holes are created when:
  • electric discharge causes damage to semicondcutors
  • there are too many electrons
  • a co-valent bond is broken due to thermal energy, the removal of one electron leaves a vacancy
  • none of these
For what purpose LEDs are used in the circuit?
  • LEDs are used to produce high feedback current
  • LEDs are used to give a visual feedback from the circuit
  • LEDs are used to control the current
  • LEDs are used to control the voltage
For one electron vacancy,
  • no holes are created
  • 1 hole is created
  • 2 holes are created
  • 4 holes are created
State whether given statement is True or False
Resistivity of semiconductor depends on atomic nature of semiconductor.
  • True
  • False
The concepts of holes is introduced based on 
  • the notion that it is a whole lot easier to keep track of the missing particles in an "almost-full" band
  • the keeping track of the actual electrons in that band
  • the charge of holes
  • none of the above
In physics, chemistry, and electronic engineering, _______________ is the lack of an electron at a position where one could exist in an atom or atomic lattice.
  • an electron hole
  • electron
  • proton
  • neutron
A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.
  • HOMO
  • valence band
  • conduction band
  • LUMO
The relationship between band gap energy and temperature can be described by ____________.
  • supersymmetric quantum mechanics.
  • hyperuniformity.
  • phonons theory.
  • Varshni's empirical expression.
The ________________ determines how electrons respond to forces (via the concept of effective mass).
  • electrostatic forces
  • dispersion relation
  • magnetic force
  • lorentz force
Which of the following cannot be used in electronic devices?
  • Aluminium gallium arsenide
  • Indium gallium arsenide
  • Gallium arsenide
  • Quasicrystals.
The output of AND gate is ____________.
  • $$Y=A\cdot B$$
  • $$Y=A+B$$
  • $$Y=\overline{A+B}$$
  • $$Y=\overline{A\cdot B}$$
When a hole is produced in P-type semiconductor, there is 
  • Extra electron in valence band
  • Extra electron in conduction band
  • Missing electron in valence band
  • Missing electron in conduction band
The conductivity of intrinsic semiconductor decreases with increase in temperature.
  • True
  • False
The colour of light emitted by an LED depends on
  • Its reverse bias
  • The amount of forward current
  • Its forward bias
  • Type of semiconductor material
The colour of light emitted by a LED depends on
  • Its reverse bias
  • The amount of forward current
  • Its forward bias
  • Type of semiconductor material
Which gate can be obtained by shorting both the input terminals of a NOR gate?
  • NOT
  • OR
  • AND
  • NAND
Generally semiconductor can be used safely between the temperatures :
  • $$-75$$ and $$200$$
  • $$0$$ and $$75$$
  • $$-25$$ and $$300$$
  • $$-40$$ and $$1000$$
In $$n-p-n$$ transistor, if doping in base region is increased then collector current.
  • Remain same
  • Increases
  • Decreases
  • None of the above
The heavily and lightly doped regions of a bipolar junction transistor are respectively
  • Base and emitter
  • Base and collector
  • Collector and base
  • Collector and emitter
  • Emitter and base
The n-side of the depletion layer of a p-n junction.
  • Always has same width as of the p-side
  • Has no bound charges
  • Is negatively charged
  • Is positively charged
Which of the following gates will have an output of $$1$$?
696207_8f2c35b5f75d4197970fc914e5ef25cf.jpg
  • $$D$$
  • $$A$$
  • $$B$$
  • $$C$$
In the three parts of a transistor, 'Emitter' is of
  • Moderate size and heavily doped
  • Large size and lightly doped
  • Thin size and heavily doped
  • Large size and moderately doped
Which of the following is not a logic gate?
  • AND
  • OR
  • NOT
  • NAT
The load voltage is approximately constant when a zener diode is
  • Forward-biased
  • Reverse-biased
  • Operating in the breakdown region
  • Unbiased
Which of the following devices can be used as a square law device for modulation.
  • p-n-p transistor in active region
  • p-n junction diode near threshold voltage.
  • Superconductor
  • Inductor
Bye surgery is one of the medical procedures in which laser technology has become an important aid. Who, among the following was the first to produce laser in $$1960$$?
  • Nikolai Basov
  • Charles Towns
  • Theodore Maiman
  • Aleksandr Prochorov
A toggle flip flop can be constructed using JK flip flop by connecting ___________.
  • Toggle input to J and K
  • Toggle input to J and inverted from of toggle input to K
  • Inverted from of toggle input to K
  • None of the above
Zener breakdown takes place if:
  • Doped impurity is low
  • Doped impurity is high
  • Less impurity in N-part
  • Less impurity in P-type
On increasing the temperature of a semi-conductor material
  • Density of charge-carrier as well as their mobilities both increases
  • Density of charge-carriers increases, but their mobilities decreases
  • Density of charge-carries decreases, but their mobilities increases
  • Both density of charge-carriers as well as their mobilities decreases
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