UGC NET 2014: June, Paper II, Electronic Science
Text of page 1
PAPER-II
ELECTRONIC SCIENCE
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J 8 8 1 4 (In words)
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Number of Pages in this Booklet : 12 Number of Questions in this Booklet : 50
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J-88-14 1 P.T.O.
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ELECTRONIC SCIENCE
Paper – II
Note : This paper contains fifty (50) objective type questions of two (2) marks each. All
questions are compulsory.
1. For the circuit shown in figure, the 5. What bandwidth is needed for an FM
terminal voltage Vab is given by : signal that has a peak deviation of
± 3 KHz and handles audio signals
from 200 Hz to 5 KHz ?
(A) 6 KHz
(B) 16 KHz
(C) 10 KHz
(A) 5 V (B) 6 V
(D) 9.6 KHz
(C) 2.5 V (D) 3 V
2. The earth has a conductivity of 6. In which of the following base
10–2 mho/m, ∈r = 10, µr = 2, f = 10 system, 132 is not a valid number ?
GHz, the earth behaves like a (A) Base 16 (B) Base 10
(A) Good conductor (C) Base 8 (D) Base 2
(B) Moderate conductor
(C) Good dielectric
7. What is the relation between k and T
(D) Bad dielectric such that a unity feedback control
system whose open loop transfer
3. The carrier velocity in a silicon p-i-n function below is stable :
photodiode with 25 µm depletion k
layer width is 3 × 104 m/s. The G(s) = s[s(s + 10) + T]
maximum response time for the pin
diode is given by : (A) 0 < k < 10T
(A) 52 ns (B) 2.5 ns (B) 0 > k > 10T
(C) 62 ns (D) 5.2 ns (C) 0<k<T
(D) 0 < k > T
4. For a JFET, above the pinch-off
voltage, as the drain voltage
increases, the 8. Microprocessor development had
(A) the drain current remains happened because of LSI. What is
constant. LSI ?
(B) the drain current decreases. (A) Large Scale Integral
(C) the drain current increases (B) Large Signal Integration
linearly.
(C) Large Scale Integration
(D) the drain current varies
parabolically. (D) Long Signal Integration
Paper-II 2 J-88-14
Text of page 3
9. ‘Stdio.h’ header file contains 12. In a hybrid TEE (Magic T),
functions related to following statements are given :
(A) prototypes for the standard
input/output library functions. 1. S11, S22, S33 and S44 are non-
(B) prototypes for the standard zero.
input and standard output
functions. 2. All junctions are reciprocal i.e.
(C) prototypes for the functions Sjk = Skj
that perform input from files.
3. S11, S22, S33 and S44 are zero.
(D) prototypes for functions that
perform input from strings in 4. S13 = –S23, S14 = S24, S43 = 0
memory and outputs to strings
in memory. and S34 = 0
Which one of the following is true ?
10. The threshold voltage of a MOSFET
can be lowered by (A) 1, 2 and 4 are correct.
1. using a thinner gate oxide
(B) 1 and 2 are correct.
2. reducing the carrier
concentration in the substrate (C) 2, 3 and 4 are correct.
3. increasing the carrier
(D) 1, 2 and 3 are correct.
concentration in the substrate
Of these statements :
(A) 3 alone is correct.
13. In optical fibers, following
(B) 1 and 2 are correct
statements are given :
(C) 1 and 3 are correct
(D) 2 alone is correct 1. 1550 nm is zero dispersion
wavelength
11. An angular position to be measured 2. 1330 nm is zero dispersion
using a transducer. Which of the
following types of transducers can be wavelength
used for this purpose ? 3. At 1330 nm, attenuation is
1. Circular potentiometer minimum
2. LVDT
3. E-pick off 4. At 1550 nm, attenuation is
4. Synchro minimum
Select the correct answer using the Which one of the following is correct ?
codes given below :
Codes : (A) 1 and 4 are true.
(A) 1, 2, 3 and 4 (B) 1 and 3 are true.
(B) 2 and 3
(C) 2 and 4 are true.
(C) 1, 2 and 4
(D) 1 and 4 (D) 1, 2 and 3 are true.
J-88-14 3 Paper-II
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14. Which of the following techniques 16. A linear two-terminal network can be
are used to generate frequency replaced by an equivalent circuit
modulated signal : consisting of a current source in
1. Armstrong parallel with resistor RN, where RN is
2. Foster-Sealy Discriminator the ratio of
3. Balanced Modulator 1. Closed circuit voltage to short
circuit current at the terminal
4. Reactance Modulator
pair.
Which one of the following is true ?
2. Open circuit voltage to open
(A) 1 and 2 circuit current at the terminal
(B) 1, 2 and 3 pair.
(C) 1 and 3 3. Open circuit voltage to short
(D) 1 and 4 circuit current at the terminal
pair.
4. Closed circuit voltage to open
15. Which of the following statements
circuit current at the terminal
are true regarding the operation of JK
pair.
flip-flop ?
(A) 1 and 4
1. When K input is low and J
input is high, the Q output of (B) only 2
the flip flop is reset.
(C) 3 only
2. When K input is high and J
(D) only 3 and 4
input is low, the output Q of
the flip flop is set.
3. When both the inputs K and J 17. The following signals of
are low, the output Q does not microprocessors are intercepts :
change.
1. TRAP
4. When both the inputs K and J
are high it is possible to set or –––––
2. INTA
reset the flip-flop (ie) the
output toggle on next positive ––
3. IO/ M
clock edge.
–––––––––
Which one of the following is true ? 4. RESET IN
(A) 1 and 2 (A) 1 and 3
(B) 3 and 4 (B) 1 and 4
(C) 1, 2 and 3 (C) 2 and 3
(D) All of the above (D) 3 and 4
Paper-II 4 J-88-14
Text of page 5
18. C programming language can be 21. Consider the following Excimer
considered as Lasers used for photolithography and
surgery purposes :
1. Low level programming
1. Ar2 Excimer laser
2. High level programming
3. Assembly level programming 2. ArF Excimer laser
3. XeCl Excimer laser
4. Machine level programming
4. XeF Excimer laser
(A) 1 and 4 (B) 2 and 3
The correct sequence of the
(C) 1 and 2 (D) 3 and 4 descending order of wavelength of
operation is
19. A linear two terminal circuit can be (A) 2, 3, 1, 4 (B) 1, 2, 3, 4
replaced by an equivalent circuit (C) 1, 3, 2, 4 (D) 4, 3, 2, 1
consisting of a voltage source Vt in
series with a resistor Rt where Rt is
22. Arrange the following communication
the ratio of systems in increasing order of their
1. open circuit voltage to the short available commercial bandwidth :
circuit current at the terminal 1. Satellite Communication System
pair.
2. Amplitude Modulated System
2. short circuit current to the short 3. Frequency Modulated System
circuit voltage at the terminal.
4. Two-line transmission system
3. Open circuit voltage to the
open circuit current at the Correct sequence is
terminal pair. (A) 4, 2, 3, 1 (B) 1, 2, 3, 4
4. the independent sources are (C) 4, 3, 2, 1 (D) 1, 3, 2, 4
turned off.
(A) 1 and 4 (B) 2 and 4 23. Priority of the interrupts in the order
(C) 3 and 4 (D) 2 and 3 from the highest to least priority
1. RST 7.5
2. RST 5.5
20. Semi conductors have
–––––––––
(A) Positive temperature coefficient 3. RESET IN
of resistance 4. RST 6.5
(B) Zero temperature coefficient of The correct sequence is
resistance (A) 1, 4, 2 and 3
(C) Negative temperature coefficient (B) 3, 1, 4 and 2
of resistance
(C) 2, 4, 1 and 3
(D) Resistance does not change
(D) 3, 2, 4 and 1
with temperature
J-88-14 5 Paper-II
Text of page 6
24. Sequence of operators according to
27. List – I List – II
the priority
1. ‘/’ 2. ‘+’ a. Multiplexer i. Selects one of
3. ‘*’ 4. ‘–’ many inputs to
The correct sequence is a single output
(A) 1, 2, 3 and 4 b. Flip-Flop ii. Combinational
(B) 2, 3, 4 and 1 circuit
(C) 3, 4, 1 and 2
c. Shift iii. Memory
(D) 3, 1, 2 and 4
Register
d. Parallel iv. Sequential
25. What is the correct sequence of the
following step in the fabrication of a Adder logic
monolithic, bipolar junction transistor ? Codes :
1. Emitter diffusion
a b c d
2. Base diffusion
3. Buried layer formation (A) i iii iv ii
4. Epi-layer formation (B) i iv ii iii
Select the correct sequence using the
codes given below : (C) i ii iv iii
(A) 3, 4, 1, 2 (B) 4, 3, 1, 2 (D) i iii ii iv
(C) 3, 4, 2, 1 (D) 4, 3, 2, 1
28. List – I List – II
26. Match List – I with List – II and
select the correct answer using codes a. Shot Noise i. Resistance
given below :
b. Johnson ii. Diode
List – I List – II
Noise
– i. ρv
a. ∇×H
c. Current iii. P-N junction
– ∂B Noise
b. ∇⋅D ii. –
∂t
– – d. Partition iv. Triode
c. ∇×E – ∂D Noise
iii. J+
∂t
– iv. 0 Codes :
d. ∇ ⋅ (∇ × B)
a b c d
Codes :
a b c d (A) i ii iv iii
(A) iv i ii iii (B) iii iv i ii
(B) iii i ii iv
(C) iii ii i iv (C) iv i ii iii
(D) i ii iii iv (D) ii i iii iv
Paper-II 6 J-88-14
Text of page 7
29. List – I List – II 31. List – I List – II
a. 1550 nm i. 100 GHz a. Flash i. Integrating
b. 0.8 nm ii. Visible light converter type
c. 400-700 nm iii. Ultra violet b. Successive ii. Fastest
approximation converter
d. 200 nm iv. 193 T Hz
c. Counter iii. Maximum
Codes :
Ramp conversion
a b c d Time = N
(A) iv i ii iii bits
(B) iv ii i iii d. Dual Slope iv. Uses a DAC
in its feed-
(C) i ii iii iv
back path
(D) iv iii i ii
Codes :
a b c d
30. List – I List – II
(A) ii iii iv i
(Structure/ (Reasons)
(B) i iii iv ii
Characteristics)
(C) ii iv iii i
a. n-channel i. Reverse bias
(D) i iv iii ii
JFET is better increases along
than p-channel the channel
JFET
b. Channel is ii. High electric 32. List – I List – II
wedge shaped field near the (Devices) (Characteristics)
drain and a. BJT i. Voltage
directed controlled
towards source negative
c. Channel is not iii. Low leakage resistance
completely current at the b. MOSFET ii. High current
closed at gate terminal gain
pinch-off
c. Tunnel iii. Voltage
d. Input iv. Better diode regulation
impedance is frequency
high performance d. Zener diode iv. High input
since µn >> µp impedance
Codes :
Codes :
a b c d
a b c d
(A) ii iv i iii
(A) iv i ii iii
(B) i iv ii iii
(B) iv ii iii i
(C) ii iii i iv
(C) iii i ii iv
(D) i iii ii iv
(D) ii iv iii i
J-88-14 7 Paper-II
Text of page 8
33. List – I List – II 35. List – I List – II
a. Gauss meter i. Pressure
measurement a. Super i. Ratio of
b. Logic ii. Flow position excitation to
analyser measurement theorem response is
c. Pirani gauge iii. Trouble constant
shooting of when the
digital
positions of
electronic
circuits excitation
d. Rotameter iv. Magnetic flux and response
density are
Codes : interchanged
a b c d
b. Thevenin’s ii. Applicable
(A) i iv iii ii
theorem to linear
(B) ii iii i iv
(C) i ii iii iv systems
(D) iv iii i ii c. Reciprocity iii. Source
theorem represented
34. List – I List – II by its
a. AC i. Contains the data of
Thevenin’s
stored from
registers equivalent
b. SP ii. used for storing circuits
address of the
d. Maximum iv. Reduce some
external memory
power portion of
c. HL iii. Contains the
address of the transfer circuit to an
instructions which theorem equivalent
has to be executed source and a
after completion of single
execution of present
element
instruction.
d. PC iv. Primary register to Codes :
perform arithmetic
and logical a b c d
operations
Codes : (A) iii i iv ii
a b c d (B) ii iv i iii
(A) ii iii iv i
(B) iii i ii iv (C) iv iii i ii
(C) iv i ii iii
(D) ii i iv iii
(D) ii iv iii i
Paper-II 8 J-88-14
Text of page 9
Directions : Q. Nos. 36 to 45 : The 37. Assertion (A) : An EDFA is usually
following items consists of two statements, pumped at 980 nm wavelength,
one labelled the “Assertion (A)” and the which means that Erbium ions
at ground level absorb energy.
other labelled the “Reason (R)”. You are to
examine these two statements carefully and Reason (R) : This absorbed
decide if the Assertion (A) and Reason (R) energy is transferred to high
frequency signals to boost up.
are individually true and if so, whether the
reason is a correct explanation of the
Assertion. Select your answer to these 38. Assertion (A) : D-flip-flops are
items using the codes given below and used as buffer register.
mark your answer accordingly. Reason (R) : Flip-flops are free
Codes : from “race-around” condition.
(A) Both (A) and (R) are true and (R) is
the correct explanation of (A). 39. Assertion (A) : Routh Hurwitz
criterion gives both absolute as
(B) Both (A) and (R) are true, but (R) is
well as relative stability using
not correct explanation of (A).
characteristic equation.
(C) (A) is true, but (R) is false.
Reason (R) : For a system to be
(D) (A) is false, but (R) is true. stable all roots of characteristic
equation must lie in left half of
s-plane.
36. Assertion (A) : Brewster angle is
the angle of incidence at which
40. Assertion (A) : Considering two
there is no reflection.
p-n-p and n-p-n transistors of
Reason (R) : For parallel identical construction as far as
polarisation, Brewster angle is shape, size and doping are
given by following expression : concerned, the n-p-n transistor
will have a better frequency
∈r2 response.
cos θi + – sin2θi
Er ∈r1
Reason (R) : The electron
Ei = ∈r2
cos θi – + sin2θi mobility is higher than that of
∈r1 the hole mobility.
J-88-14 9 Paper-II
Text of page 10
41. Assertion (A) : If a semiconductor 44. Assertion (A) : MOV A, 08 H
is placed in a transverse It means the contents of
magnetic field B and an electric memory address 08 H are
field E is applied across its moved to be contents of A.
other two faces, then it would Reason (R) : MV 1 A, 82 H
produce an electric current ‘I’
It means that the contents of
in the direction perpendicular memory address 82 H are
to both B and E. moved to be contents of A
immediately.
Reason (R) : Hall coefficient is
proportional to the mobility of
the charge carriers in the semi 45. Assertion (A) : To avoid repetition
conductor. of code and bulky programs
functionally related statements
are isolated into a function.
42. Assertion (A) : A monostable Reason (R) : Function definition
multivibrator can be used to defines the body of the function.
alter the pulse width of a
repetitive pulse train.
Read the passage and answer the questions
Reason (R) : Monostable 46 to 50 that follows based on your
multivibrator has a single understanding of passage :
stable state.
An antenna is generally a metallic object,
often a wire or collection of wires, used to
43. Assertion (A) : In a two port convert high frequency current into
network, with 4 terminals four electromagnetic waves and vice-versa.
types of parameters like Antenna serve either or both of the
impedance, admittance, hybrid following two functions, generation or the
and transmission are collection of electromagnetic energy. In a
transmitting system, a radio-frequency
considered and they are related
signal is developed, amplified, modulated
to each other. and applied to the antenna. The R-F
Reason (R) : The assumption currents flowing through the antenna
made for the above statement is produce electromagnetic waves which
radiate into the atmosphere. In a receiving
that there are no independent
system, electromagnetic waves “cutting”
sources and non-zero initial through the antenna induce alternating
conditions within the linear currents for use by the receiver.
port network.
Paper-II 10 J-88-14
Text of page 11
Efficient operation also requires that the 46. A helical antenna is used for satellite
receiving antenna be of the same tracking because of its
polarization as the transmitting antenna. (A) circular polarization
Polarization is the direction of the electric
field and is therefore, the same as the (B) elliptical polarization
antennas physical configuration. Thus (C) broad band width
vertical antenna will transmit vertical (D) good front-to-back ratio
polarized light, any antenna having a
physical length that is one-half wavelength
of the applied frequency is called a Hertz 47. The discone antenna is
antenna. Hertz antenna are predominantly (A) a useful direction finding
used with frequencies above 2 MHz. antenna
Usually, at frequencies below 2 MHz, a (B) used as a radar receiving
Marconi type of antenna is used. The antenna
Marconi antenna is usually a quarter-wave
grounded antenna or any odd multiple of a (C) circularly polarized like other
quarter wavelength. circular antennas
(D) useful as a UHF receiving
The Yagi-Uda antenna consists of a drivers
antenna
element and two or more parasitic
elements. Yagi-Uda has two parasitic
elements, a reflector and a director. This 48. Which of the following antennas is
Yagi-Uda antenna provides about 7 dB of best exerted from a waveguide ?
power gain with respect to a half- (A) Biconical
wavelength dipole reference. More
complex antennas may be circularly (B) Folded dipole
polarized both vertically and horizontally (C) Horn
polarized waves are radiated with equal (D) Discone
power in both. If the powers are unequal
the antenna is said to be elliptically
polarized. 49. Which is a non-resonant antenna ?
A horn is an ideal antenna for terminating a (A) Marconi
waveguide and may be conical, rectangular (B) Rhombic
or sectorial. Wide band antennas either (C) Yagi-Uda
when the transmissions are wide band or
(D) Discone
when working of narrow channels over a
wide frequency range is the major
application. Helical antenna, which 50. An antenna is polarized in the plane
consists of a loosely wound helix backed of the field perpendicular to
up by a metal ground plane. Loop antennas (A) Electric field
are often used for direction finding. Loops
have many shapes and generally consists of (B) Magnetic field
a single turn of wire. Discone is a ground (C) Both Electric and Magnetic
plane antenna evolved from the vertical field
dipole and having a very similar radiation (D) Field parallel to both electric
pattern. and magnetic field
J-88-14 11 Paper-II
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Space For Rough Work Paper-II 12 J-88-14
Text of page 1
UGC - NET EXAM JUNE 2014 GRIEVANCES
KEYS - PAPER 2
Subject (88 ) ELECTRONIC SCIENCE
Qno Answer
1 B
2 C
3 D
4 A
5 B
6 D
7 A
8 C
9 B
10 B
11 D
12 C
13 C
14 D
15 B
16 C
17 B
18 C
19 A
20 C
21 D
22 A
23 A
24 D
25 C
26 B
27 A
28 D
29 A
30 A
31 A
32 A
33 D
34 C
35 B
36 C
37 C
38 C
39 D
40 A
41 B
42 B
43 A
44 D
45 A
46 A
47 D
48 C
49 B
50 APage 1 of 12
Source: University Grants Commission. Question paper published by University Grants Commission.