UGC NET 2012: June, Paper II, Electronic Science
Text of page 1
PAPER-II
ELECTRONIC SCIENCE
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J 8 8 1 2 (In words)
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J-88-12 1 P.T.O.
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ELECTRONIC SCIENCE
Paper – II
Note : This paper contains fifty (50) objective type questions, each question carrying two (2)
marks. Attempt all the questions.
1. In a JFET the change in drain current 6. The output Vo of the ideal Op-Amp
is due to the applied circuit shown in the figure is
(A) Electric field between S and D
(B) Electric field between G and S
(C) Magnetic field between S and D
(D) Magnetic field between G and S
2. The increase in temperature, the
electrical conductivity would
(A) increase in metals as well as
increase in semiconductors
(B) increase in metals but decrease in
semiconductors (A) –10 V (B) –5 V
(C) decrease in metals but increase in (C) 5 V (D) 10 V
semiconductors
(D) decrease in metals as well as in 7. How many Flip-Flops are required to
semiconductors build a binary counter circuit to count
from 0 to 1023 ?
3. A network contains only independent (A) 1 (B) 6
current sources and resistors. If values (C) 10 (D) 24
of all resistors are doubled, then values 8. Among the following, the slowest
of node voltages ADC (Analog-to-digital converter) is
(A) will become half (A) Parallel-comparator (i.e.) flash type
(B) will remain unchanged (B) Successive approximation type
(C) will become double (C) Integrating type
(D) cannot be determined unless (D) Counting type
circuit configuration and values
of the resistors are known 9. In a microcomputer, WAIT states are
used to
4. Thevenin’s theorem replaces a (A) make the processor wait during a
complicated circuit facing a load by an DMA operation
(A) ideal voltage source and parallel
(B) make the processor wait during a
resistor
(B) ideal current source and parallel power interrupt processing
resistor (C) make the processor wait during a
(C) ideal current source and series power shut down
resistor (D) interface slow peripherals to the
(D) ideal voltage source and series processor
resistor 10. In a microprocessor, the register which
5. When Op-Amp is used as an holds the address of the next
integrator, the feedback element is instruction to be fetched is
(A) Resistor (A) Accumulator
(B) Capacitor (B) Program Counter
(C) Zener diode (C) Stack Pointer
(D) Voltage divider (D) Instructor Register
Paper-II 2 J-88-12
Text of page 3
11. Consider the following structure and 17. A relaxation oscillator is one which
declaration : (A) oscillates continuously
1. struct date { (B) has two stable states
2. int day; (C) relax indefinitely
3. int month; (D) produces non-sinusoidal output
4. int year; 18. The transducer which generates
5. }; electrical power
Struct data *pd ; (A) Photoconductor
Which of the following is the correct (B) Photodiode
method to refer to the year member ? (C) Solar cell
(D) Phototransistor
(A) (*pd)⋅year (B) (*pd)*year
(C) (*pd)→year (D) pd→year 19. The step-index monomode fiber has
diameter
12. Which of the following is not a linear (A) ≤ 10 µm (B) 50 µm
data structure ? (C) 100 µm (D) 200 µm
(A) Array (B) Linked list 20. Which control system has hysteresis
(C) Stack (D) Tree property ?
ρ (A) ON-OFF controller
13. ∇2V = – represents (B) Proportional controller
∈
(A) Maxwell’s equation (C) Integral controller
(B) Laplace’s equation (D) P-I-D controller
(C) Poisson’s equation Directions : Q. Nos. 21 to 30 : The
(D) Gauss’s law following items consist of two
statements, one labelled the
14. The energy per unit time, per unit area “Assertion (A)” and the other
transported by the electromagnetic labelled the “Reason (R)”. You are
fields is expressed as to examine these two statements
→ 1 → → carefully and decide if the
(A) S = ( E × B) Assertion (A) and the Reason (R)
µo are individually true and if so,
→ → → whether the Reason is a correct
(B) S = ( E × B) explanation of the Assertion.
→ → → Select your answers to these items
(C) S = µo ( E × B) using the codes given below and
→ 1 → → mark your answer accordingly.
(D) S = ( E × B) Codes :
∈o (A) Both (A) and (R) are true and (R)
15. Time-Division Multiplexing is the correct explanation of (A).
(A) can be used with PAM only. (B) Both (A) and (R) are true, but
(B) combines five groups into a (R) is not correct explanation of
supergroup. (A).
(C) stacks 24 channels in adjacent (C) (A) is true, but (R) is false.
frequency slots. (D) (A) is false, but (R) is true.
(D) interleaves pulses belonging to 21. Assertion (A) : If a semiconductor is
different transmissions. placed in a transverse magnetic
field B and an electric field E is
16. One of the following types of noise applied across its other two
becomes of great importance at high faces, then it would produce an
frequencies. It is the electric current I, in the direction
(A) Shot noise perpendicular to both B and E.
(B) Random noise Reason (R) : Hall co-efficient is
(C) Impulse noise proportional to the mobility of
(D) Transit-time noise charge carrier in semi-conductor.
J-88-12 3 Paper-II
Text of page 4
22. Assertion (A) : The voltage-current 28. Assertion (A) : An half adder is faster
characteristic of tunnel diode than full-adder.
exhibits dynamic negative Reason (R) : An half adder gives
resistance region. only one output while a full
Reason (R) : The negative adder gives two outputs.
resistance occurs, therefore,
tunnel diode behaves as low 29. Assertion (A) : A programmable
power oscillating device. Read-Only-Memory can be used
as a synchronous counter.
23. Assertion (A) : R-2R ladder type D/A Reason (R) : Each memory
converter has a higher speed of
location of a programmable
conversion than a weighted
Read-Only-Memory is
resistance D/A converter.
programmed and can be read
Reason (R) : R-2R ladder type D/A
synchronously.
converter uses a smaller number
of components than the weighted 30. Assertion (A) : In PCM a message
resistance D/A converter. signal is represented by a
24. Assertion (A) : A processor can sequence of coded pulses, which
reference a memory stack is accomplished by representing
without specifying an address. the signal in discrete form in
Reason (R) : The address is always both time and amplitude.
available and automatically Reason (R) : The signal encoded in
updated in the stack pointer. the form of quantized samples
25. Assertion (A) : The part of root locus which translates into a coded
on the real axis is not dependent number.
upon the poles and zeros which
are not on the real axis. 31. Consider the following circuit
Reason (R) : Poles and zeros configurations :
which are not on the real axis 1. Common emitter
always occur in conjugate pairs. 2. Common base
3. Emitter follower
26. Assertion (A) : The top down 4. Emitter follower using
structured programming should Dartington pair
be used for developing The correct sequence in increasing
programmes. order of the input resistances of these
Reason (R) : The top down configurations is
structured programming (A) 2, 1, 4, 3 (B) 1, 2, 4, 3
methodology enables us to get (C) 2, 1, 3, 4 (D) 1, 2, 3, 4
readable and easily provable
program. 32. Digital measuring instruments use the
27. Assertion (A) : Stimulated emission is following types of A to D converters :
the key to the operation of LASER. 1. Dual slope Type
Reason (R) : An important 2. Counter Type
property of laser radiation is its 3. Flash Type
coherence, under which is meant The correct sequence for these
the correlation between the converters in decreasing order of their
phases of oscillation at different speed (fastest to slowest) is
positions in space and at various (A) 3, 1, 2 (B) 1, 2, 3
moments of time. (C) 2, 3, 1 (D) 3, 2, 1
Paper-II 4 J-88-12
Text of page 5
33. Consider the following logic families : 37. List – I List – II
1. MOS 2. DTL (a) BJT (i) Pinch off effect
3. RTL 4. ECL (b) FET (ii) Controlled
The sequence of the logic families in Rectification
the order of their increasing noise (c) SCR (iii) Negative resistance
margin is characteristics
(A) 3, 4, 1, 2 (B) 3, 4, 2, 1 (d) Tunnel (iv) Punch through
(C) 4, 3, 1, 2 (D) 4, 3, 2, 1 diode effect
Codes :
34. Consider the following communication
(a) (b) (c) (d)
systems :
(A) (i) (iii) (ii) (iv)
1. FM Broadcast
(B) (i) (ii) (iii) (iv)
2. AM Broadcast
(C) (iv) (i) (ii) (iii)
3. Microwave Communication
(D) (i) (iv) (iii) (ii)
4. Optical Fiber Communication
The sequence of the communication 38. List – I List – II
systems in the order of their increasing (a) Ampere’s (i) force on a charge
carrier frequency is law
(A) 4, 2, 1, 3 (B) 2, 1, 3, 4 (b) Biot’s law (ii) force due to a
(C) 1, 2, 3, 4 (D) 3, 4, 1, 2 current carrying
35. The highest data rate can be conductor
transmitted using following cables : (c) Coulomb’s (iii) electric flux
1. Co-axial cable law density at a point
2. Twisted-wire cable (d) Gauss’s (iv) magnetic flux
3. Optical fiber cable law density at a point
The correct sequence in the increasing Codes :
order is (a) (b) (c) (d)
(A) 1, 3, 2 (B) 3, 1, 2 (A) (iii) (ii) (i) (iv)
(C) 2, 1, 3 (D) 3, 2, 1 (B) (iv) (ii) (i) (iii)
(C) (iv) (i) (ii) (iii)
36. Match List – I with List – II and select (D) (iii) (i) (ii) (iv)
the correct answer using codes given
below : 39. List – I List – II
List – I List – II (a) Parallel (i)
n-bits
(a) LASER (i) Spontaneous comparator conversion
emission time
(b) Solar Cell (ii) Consumes (b) Successive (ii) Fastest
electrical power approximation converter
due to the (c) Dual slope (iii) Voltage
incident light dependent
(c) Photo diode (iii) Delivers power to conversion
a load type
(d) LED (iv) Stimulated (d) Counter type (iv) Integrating
emission type
Codes : Codes :
(a) (b) (c) (d) (a) (b) (c) (d)
(A) (iv) (iii) (i) (ii) (A) (ii) (i) (iii) (iv)
(B) (iii) (iv) (ii) (i) (B) (ii) (i) (iv) (iii)
(C) (iv) (iii) (ii) (i) (C) (i) (ii) (iv) (iii)
(D) (iii) (iv) (i) (ii) (D) (i) (ii) (iii) (iv)
J-88-12 5 Paper-II
Text of page 6
40. List – I List – II 43. List – I List – II
(a) Frequency (i) Envelope
(a) Gunn (i) Junction less
modulation detection
(b) Double (ii) Companding diode device
sideband (b) Solar cell (ii) Single junction
suppressed
device
signal carrier
(c) PCM (iii) Balance (c) MOSFET (iii) Double junction
modulator device
(d) Amplitude (iv) Pre-emphasis
modulation and de- (d) SCR (iv) Triple junction
emphasis device
Codes : Codes :
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv) (a) (b) (c) (d)
(B) (i) (ii) (iv) (iii) (A) (iv) (i) (ii) (iii)
(C) (iv) (iii) (i) (ii)
(B) (iii) (iv) (i) (ii)
(D) (iv) (iii) (ii) (i)
(C) (i) (ii) (iii) (iv)
41. List – I List – II
(D) (ii) (iii) (i) (iv)
(a) LVDT (i) Pressure
(b) Bourdon tube (ii) Temperature
(c) Strain gauge (iii) Displacement
(d) Thermistor (iv) Stress 44. List – I List – II
Codes : (a) Monostable (i) Quasi stable
(a) (b) (c) (d) multivibrator state
(A) (iv) (iii) (ii) (i)
(B) (iii) (ii) (i) (iv) (b) Astable (ii) One stable state
(C) (iv) (i) (iii) (ii) multivibrator
(D) (iii) (i) (iv) (ii)
(c) Schmitt (iii) Two stable
42. List – I List – II trigger state
(Flags) (Bit Position) (d) Bistable (iv) No stable state
(a) Sign flag (i) 4th bit
multivibrator
(b) Parity (ii) 6th bit
(c) Zero (iii) 2nd bit Codes :
(d) Auxiliary carry (iv) 7th bit (a) (b) (c) (d)
Codes :
(A) (i) (ii) (iv) (iii)
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv) (B) (ii) (iv) (i) (iii)
(B) (iv) (iii) (ii) (i) (C) (iii) (i) (ii) (iv)
(C) (i) (iv) (iii) (ii)
(D) (ii) (i) (iii) (iv) (D) (iv) (i) (ii) (iii)
Paper-II 6 J-88-12
Text of page 7
45. List – I List – II 46. In a communication system, noise is
(a) Semi– (i) Destructive most likely to affect the signal
conductor read out (A) at a transmitter
memory (B) in a channel
(b) Ferrite core (ii) Combinational (C) in the information source
memory logic (D) at the destination
(c) Magnetic (iii) Non-volatile
tape memory 47. Indicate the false statement.
(d) Flash (iv) EEPROM (A) HF mixers are generally noiser
memory
than HF amplifiers.
Codes : (B) Impulse noise voltage is
(a) (b) (c) (d) independent of bandwidth.
(A) (ii) (i) (iii) (iv) (C) Thermal noise is independent of
(B) (i) (ii) (iv) (iii) the frequency at which it is
(C) (ii) (iii) (i) (iv) measured.
(D) (iv) (ii) (i) (iii) (D) Industrial noise is usually of the
Read the paragraph and answer the question impulse type.
46 to 50 :
48. The value of a resistor creating thermal
Noise may be defined, in an electrical sense,
noise is doubled. The noise power
as an unwanted form of energy tending to
interfere with the proper and easy reception generated is therefore
and reproduction of wanted signals. Many (A) halved
disturbances of the electrical nature produce (B) quadrupled
noise in receiver, modifying the signal in an (C) doubled
unwanted manner. Noise is divided into two (D) unchanged
groups. Noise whose sources are external to
the receiver and other one is noise created 49. One of the following is not a useful
within the receiver itself. Various forms of
quantity for comparing the noise
noise created outside the receiver i.e.
performance of receivers :
external noise includes atmospheric and
extra-terrestrial noise and industrial noise. (A) Input noise voltage
Atmospheric noise becomes less severe at (B) Equivalent noise resistance
frequencies above 30 MHz. Extra-terrestrial (C) Noise temperature
noises are solar noise and cosmic noise. (D) Noise figure
They radiate over a very broad frequency
spectrum which includes the frequencies, we 50. Indicate the noise whose source is in a
use for communication. These disturbances category different from that of the
are at the eruption of corona flares and
other three.
sunspots. The noise generated is due to the
random motion of electrons, atoms and (A) Solar noise
molecules. Kinetic theory states that the (B) Cosmic noise
temperature of the system increases due to (C) Atmospheric noise
the motion of the particles. (D) Galactic noise
J-88-12 7 Paper-II
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Space For Rough Work Paper-II 8 J-88-12
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UGC - NET JUNE 2012 PAPER : PAPER II SUBJECT :( 88 )ELECTRONIC SCIENCE ------------------------------------------------- | QNO | KEY | QNO | KEY | QNO | KEY | QNO | KEY | |-----|-----|-----|-----|-----|-----|-----|-----| | 1 | B | 26 | A | 51 | | 76 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 2 | C | 27 | A | 52 | | 77 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 3 | D | 28 | C | 53 | | 78 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 4 | D | 29 | C | 54 | | 79 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 5 | B | 30 | A | 55 | | 80 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 6 | A | 31 | C | 56 | | 81 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 7 | C | 32 | D | 57 | | 82 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 8 | C | 33 | B | 58 | | 83 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 9 | D | 34 | B | 59 | | 84 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 10 | B | 35 | C | 60 | | 85 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 11 | A | 36 | C | 61 | | 86 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 12 | D | 37 | C | 62 | | 87 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 13 | C | 38 | B | 63 | | 88 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 14 | A | 39 | B | 64 | | 89 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 15 | D | 40 | D | 65 | | 90 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 16 | D | 41 | D | 66 | | 91 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 17 | D | 42 | B | 67 | | 92 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 18 | C | 43 | C | 68 | | 93 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 19 | A | 44 | B | 69 | | 94 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 20 | A | 45 | A | 70 | | 95 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 21 | B | 46 | B | 71 | | 96 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 22 | A | 47 | B | 72 | | 97 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 23 | C | 48 | D | 73 | | 98 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 24 | A | 49 | A | 74 | | 99 | | |-----|-----|-----|-----|-----|-----|-----|-----| | 25 | A | 50 | C | 75 | | 100 | | -------------------------------------------------
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Source: University Grants Commission. Question paper published by University Grants Commission.