CBSE Questions for Class 12 Medical Physics Semiconductor Electronics: Materials, Devices And Simple Circuits Quiz 3 - MCQExams.com

Filter circuit
  • eliminates a.c. component
  • eliminates d.c. component
  • does not eliminate a.c. component
  • None of these
Current gain in common base configuration is less than I because
  • $$I_e < I_b$$
  • $$I_b < I_e$$
  • $$I_c < I_e$$
  • $$I_e < I_c$$
The gate for which output is high, if at least one input is low is
  • NAND
  • NOR
  • AND
  • OR
In common collector circuit, voltage gain is
  • very high
  • moderate
  • low
  • very low
Bridge type rectifier
  • uses four diodes
  • uses six diodes
  • uses two diodes
  • uses one diode
Zener diode works on
  • zero bias
  • reverse bias
  • forward bias
  • infinite bias
A transistor is essentially
  • a current operated device
  • power driven device
  • a voltage operated device
  • resistance operated device
A student finds a three legged device in a given mixed collection of items while performing an experiment. Which device is it?
  • Resistor
  • Capacitor
  • Transistor
  • Diode
Which among the following is an example of a semiconductor?
  • cuprous oxide
  • iron
  • copper
  • aluminium
Transistor is a:
  • current-controlled current device
  • current-controlled voltage device
  • voltage-controlled current device
  • voltage-controlled voltage device
The lead marked with the arrow is the _______.
382770_5cd44ba8cd7047f58e2cc66be82af862.png
  • collector
  • base
  • emitter
  • core
If the current through a circuit is too weak, we can use LED because it glows even when a weak electric current flows through it.
  • True
  • False
  • Ambiguous
  • Data insufficient
Integrated circuit is defined as:
  • a single electronic circuit on a small plate of semiconductor material.
  • a set of electronic circuits on one small plate of semiconductor material.
  • a circuit capable of generating dc currents.
  • a plate of semiconductor material used to connect external multiple circuits
A junction transistor does not have a/an ________ .
  • emitter-base junction
  • base-collector junction
  • emitter-collector junciton
  • none of the above
The vacancy created due to the absence of an electron in the valence band of a semiconductor is called a _________ .
  • electron
  • hole
  • proton
  • position
For germanium diode, the junction voltage is about _____.
  • $$0.7V$$
  • $$0.3V$$
  • $$0.6V$$
  • $$3V$$
In an LED, the longer lead is always connected to the ________ terminal of the battery and the shorter lead is connected to the ________ terminal of the cell (or battery)
  • positive, negative
  • negative, positive
  • positive, neutral
  • neutral, positive
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Which of the following logic gates is an universal gate?
  • OR
  • NOT
  • AND
  • NOR
$$A$$$$B$$$$Q$$
$$0$$$$0$$$$0$$
$$0$$$$1$$$$1$$
$$1$$$$0$$$$1$$
$$1$$$$1$$$$1$$
The truth table is given above for which of the following gates is correct
  • NAND gate
  • OR gate
  • AND gate
  • NOT gate
$${CO}_{2}$$ laser uses
  • microwaves
  • infra red
  • ultra violet
  • visible light
Which logic gate produces LOW output when any of the inputs is HIGH?
  • AND
  • OR
  • NAND
  • NOR
In LED visible light is produced by
  • Gallium phosphide
  • Gallium arsenide
  • Germanium phosphide
  • Silicon phosphide
A transistor is a/an
  • chip
  • insulator
  • semiconductor
  • metal
The energy band gap (distance between the conduction band and valence band) in conductor is.
  • $$0$$
  • $$4\overset{o}{A}$$
  • $$10\overset{o}{A}$$
  • $$100\overset{o}{A}$$
The number $$0$$ (zero) is required for
  • transistor
  • abacus
  • computer
  • calculator
The truth table given below is for (A and B are the inputs, Y is the output)
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
  • NOR
  • AND
  • XOR
  • NAND
The necessary condition in making of a junction transistor (E-emitter, B-base and C-collector)
  • E is heavily doped, B is thin and lightly doped and C is moderately doped
  • E and C are lightly doped and B is thick and heavily doped
  • E and B are heavily doped and C is lightly doped
  • E and B are lightly doped an C is heavily doped
Which of the following is correct, about doping in a transistor?
  • Emitter is lightly doped, collector is heavily doped and base is moderately doped
  • Emitter is lightly doped, collector is moderately doped and base is heavily doped
  • Emitter is heavily doped, collector is lightly doped and base is moderately doped
  • Emitter is heavily doped, collector is moderately doped and base is lightly doped
In an n-p-n transistor:
  • the emitter has higher degree of doping compared to that of the collector
  • the collector has higher degree of doping compared to that of the emitter
  • both emitter and collector have same degree of doping
  • the base region is most heavily doped
The principle of LASER action involves:
  • Amplification of particular frequency emitted by the system
  • Population inversion
  • Stimulated emission
  • All of the above
A laser beam passes through the air into a piece of plexiglass. Find out the possible change in property of the laser beam 
  • The velocity decreases
  • The wavelength increases
  • The frequency decreases
  • The period decreases
  • None of the above is true
What is true about the breakdown voltage in a zener diode?
  • It decreases when current increases.
  • It destroys the diode.
  • It equals the current times the resistance.
  • It is approximately constant.
The output of NOT gate when its input is $$0$$:
  • is $$1$$
  • is $$0$$
  • can be $$0$$ or $$1$$
  • is $$0$$ and $$1$$
In the depletion region of a pn junction, there is a shortage of
  • Acceptor ions
  • Holes and electrons
  • Donor ions
  • None of these
A pn junction is a/an
  • Bidirectional component
  • Unidirectional Component
  • Linear component
  • None of these
The zone in a semiconductor diode where no free charge carriers exists is known as the:
  • anode region
  • cathode region
  • depletion region
  • None of these
The pn junction can be formed by which of the following methods?
  • Grown junction method
  • Alloying method
  • Diffusion method
  • All of these
The battery connections required to forward bias a pn junction are ____________
  • +ve terminal to p and -ve terminal to n
  • -ve terminal to p and +ve terminal to n
  • -ve terminal to p and -ve terminal to n
  • None of these
When semiconductor is doped half with trivalent and half with pentavalent impurities, junction formed is known as
  • pn junction
  • barrier junction
  • potential barrier
  • both a and b
In a semiconductor diode, the depletion region is removed when:
  • the diode is in its forward conducting state
  • the diode is in its reverse non-conducting state
  • there is no potential difference between the anode and cathode
  • None of these
The leakage current across a pn junction is due to _________
  • Minority carriers
  • Majority carriers
  • Junction capacitance
  • None of these
Two important processes that occur during the formation of a p-n junction.
  • Diffusion
  • Drift
  • Both drift and diffusion
  • Drift in p region and diffusion in n region
A hole is
  • A positively charge electron
  • An electron in valence band
  • An unfilled covalent bond
  • An excess electron in covalent bond
The thickness of the depletion region is of the order of ___________ of a micrometre.
  • one-hundredth
  • one-tenth
  • one-thousandth
  • None of these
Integrated circuits are preferred over conventional circuits because:
  • They are very compact in size.
  • They are cheap.
  • They are fast and more efficient.
  • All of the above
Which of the following is used for the fabrication of Integrated circuits?
  • Semiconductors
  • Metals
  • Insulators
  • Alloys.
The value of $$DC$$ voltage in half wave rectifier in converting $$AC$$ voltage $$V= 100\ sin(314t)$$ into $$DC$$ is
  • $$30.3 volt$$
  • $$100 volt$$
  • $$50 volt$$
  • $$0$$
Use of ICs has lead to an increase in speed of PCs. Current processor speeds in personal computers is of the order of:
  • $$kHz$$
  • $$MHz$$
  • $$GHz$$
  • $$THz$$
Which of the following applications is not based on use of ICs?
  • Microprocessor chip.
  • Laptops and personal computers.
  • Mobile phones.
  • Transformers.
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