UGC NET 2011: June, Paper II, Electronic Science
Text of page 1
PAPER-II
ELECTRONIC SCIENCE
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J 8 8 1 1 (In words)
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Number of Pages in this Booklet : 8 Number of Questions in this Booklet : 50
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J-88-11 1 P.T.O.
Text of page 2
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 transistor amplifier, the reverse 7. Indicate which of the following
saturation current ICO diode does not use negative
(A) Doubles for every 10° C rise in resistance in its operation ?
temperature (A) Backward (B) Gunn
(B) Doubles for every 1° C rise in (C) IMPATT (D) Tunnel
temperature
(C) Increases linearly with 8. If the modulation index of an AM
temperature wave is changed from 0 to 1, the
(D) Doubles for every 5° C rise in transmitted power is
temperature (A) Unchanged
2. The frequency of oscillations in (B) Halved
(C) Doubled
Colpitts oscillator is determined by (D) Increased by 50 percent
(A) L only
(B) C only 9. Speed of a dc motor can be
(C) L and C only controlled by
(D) Transistor gain (A) Triac (B) UJT
(C) Chopper (D) Inverter
3. If the voltage drop across a 2 kΩ
resistor is 8 V, what is the current 10. The resistance of thermistor is a
flowing in the resistor ? function of
(A) 8 mA (B) 2 mA (A) Current (B) Temperature
(C) 4 mA (D) 1 mA (C) Heat (D) Voltage
4. IC 7432 is a 2-input 11. 0.8 nm separation in wavelength
(A) EX-OR Gate division multiplexing operating at
(B) OR Gate 1550 nm wavelength, refers to
(C) NOR Gate (A) 10 GHz (B) 25 GHz
(D) NAND Gate (C) 100 GHz (D) 2.5 GHz
5. In 8085 microprocessor, the value of 12. The transfer function of the system
most significant bit of the result shown below is
following the execution of any
arithmetic Boolean instruction is
stored in the
(A) Carry status flag
(B) Auxilliary carry status flag
C(S) G(S)
(C) Sign status flag (A) R(S) = 1 + G(S) H(S)
(D) Zero status flag
C(S) G(S)
(B) R(S) = 1 – G(S) H(S)
6. Which is a correct statement ?
(A) if (age = 16) C(S) 1
(B) if (age = = 16) (C) R(S) = 1 + G(S) H(S)
(C) if (age, 16) G(S) 1
(D) if (age : 16) (D) R(S) = 1 – G(S) H(S)
Paper-II 2 J-88-11
Text of page 3
– – 18. A signal flow is shown below, has
13. A (B+C)D is equal to
–– –
(A) A + BC + D
– –– –
(B) A(BC + D)
– – – –
(C) A + B(C + D)
–
(D) A ⋅ (BC + D) 1. There are three forward paths.
2. There are three individual loops.
14. The term critical frequency denotes 3. There are two non-touching
(A) The lower frequency reflected loops.
by ionosphere 4. There are three non-touching
(B) The highest frequency loops.
reflected by ionosphere The correct answer is
(C) The lowest frequency by (A) 1 and 3 only
which communication is (B) 2 and 4 only
possible between any two (C) 1 and 2 only
given points (D) 1, 2 and 3 only
(D) None of the above
19. In a TV transmission
15. Which one of the following 1. Audio and Video are both
addressing mode cannot be used in frequency modulate.
8085 ? 2. Audio is frequency modulated.
(A) Direct addressing 3. Video is transmitted by SSB
(B) Base Register addressing modulation.
(C) Register Indirect addressing 4. Video is transmitted using
(D) Immediate addressing USB modulation.
The correct answer is
16. OP-AMP has the following (A) 1 and 3 (B) 2 and 4
1. High input impedance (C) 1 and 2 (D) 3 and 4
2. Low output impedance
3. Low slew rate 20. Consider the following statements
4. Infinite CMRR regarding configuration of TTL
devices :
The correct answer is
1. The output impedance of totem
(A) 1, 2 and 4 (B) 1, 2 and 3
pole transistor is high.
(C) 1, 3 and 4 (D) 1 and 3
2. Open collector output devices
have low switching speed.
17. IC 555 timer consists of the 3. Power consumption of
following : Schottky devices is high.
1. Differential stage 4. Tristate output devices have
2. Flip Flop high switching speed
3. Discharge Transistor The correct answer is
4. Discharge Capacitor (A) 1 and 2 are correct
The correct answer is (B) 1, 3 and 4 are correct
(A) 1 and 4 (B) 2 and 3 (C) 2 and 3 are correct
(C) 1, 2 and 3 (D) 2, 3 and 4 (D) 2, 3 and 4 are correct
J-88-11 3 Paper-II
Text of page 4
Questions 21 to 30 are Assertion and 24. Assertion (A) : The race hazard
Reason type. Select your answers to problem does not occur in
these items using the codes given combinational circuits.
below and mark your answer sheet Reason (R) : The output of a
accordingly. combination circuit depends
upon present inputs only.
Codes :
(A) Both (A) and (R) are true and 25. Assertion (A) : IC 8255 A is a
(R) is the correct explanation programmable peripheral
of (A). interface device.
Reason (R) : It can work as a
(B) Both (A) and (R) are true but
timer.
(R) is not a correct explanation
of (A). 26. Assertion (A) : Helical antennas
(C) (A) is true but (R) is false. can be used as feeder for large
(D) (A) is false but (R) is true. parabolic reflectors to obtain
circular polarisation.
Reason (R) : Parabolic reflectors
(A) and (R) Questions (21-30) reverse the sense of polarisation
21. Assertion (A) : The ion of the wave during reflection.
implantation is done by
27. Assertion (A) : Frequency
bombarding ions to the modulation (FM) is preferable to
semiconductor surface. amplitude modulation (AM) for
Reason (R) : The doping is transmitting high quality music.
changed by ion implantation. Reason (R) : FM signal can be
demodulated using frequency
discriminator circuit.
22. Assertion (A) : Superposition
theorem can be used to 28. Assertion (A) : A triac is a three
determine the output of a full terminal semiconductor
wave rectifier whose inputs are switching device which can
sinusoidal signal sources of control alternating current in a
different frequencies connected load.
Reason (R) : Triac can conduct
in series. current in either direction.
Reason (R) : Superposition
theorem holds good for all linear 29. Assertion (A) : Single mode fiber
systems. (SMF) are preferred over
multimode fiber (MMF) in
optical fiber communication
23. Assertion (A) : Class C amplifier is systems.
a tuned amplifier which needs a Reason (R) : The attenuation of
resonant tank circuit as the load SMF is of the order of 5 dB/km.
in the collector circuit of the
transistor for its proper 30. Assertion (A) : The ‘do-while’
operation. statement is used less frequently
than the ‘while’ statement.
Reason (R) : In class C Reason (R) : For most
operation, the collector current applications, it is more natural to
flows for less than 180° of the test for continuation of a loop at
ac cycle and hence collector the beginning rather than at the
current flows in the pulses. end of the loop.
Paper-II 4 J-88-11
Text of page 5
Sequence type (31-35) 36. Match List – I with List – II and
31. The correct sequence in microwaves select the correct answer using codes
in terms of increasing frequency is given below :
I. L Band II. S Band List – I List – II
(a) DC voltage (i) Reverse
III. C Band IV X Band polarity
Correct Answer is (b) AC voltage (ii) Fixed polarity
(A) IV, I, II, III (B) I, II, III, IV (c) Ohm’s law (iii) P = W/T
(C) II, IV, I, III (D) III, IV, II, I (where w is
work done)
32. The correct sequence of rise in time (d) Power (iv) V = IR
period is Codes are :
I. Pico second (a) (b) (c) (d)
II. Femto second (A) (i) (ii) (iii) (iv)
III. Tera second (B) (iv) (i) (ii) (iii)
(C) (ii) (i) (iv) (iii)
IV. Nano second
(D) (i) (iii) (iv) (ii)
Correct Answer is
(A) I, II, III, IV (B) IV, III, II, I 37. List – I List – II
(a) Resistive (i) Diaphragm
(C) II, I, IV, III (D) II, I, III, IV
Transducer
33. The correct sequence of fabrication (b) Capacitive (ii) LDVT
of IC’s are Transducer
I. Masking (c) Inductive (iii) Humidity
Transducer
II. Metallization
(d) Pressure (iv) Potentiometer
III. Application of photo resist Transducer
IV. Ion implantation Codes are :
(A) I, II, III, IV (B) III, I, IV, II (a) (b) (c) (d)
(C) I, II, IV, III (D) I, III, IV, II (A) (iv) (iii) (ii) (i)
(B) (iii) (ii) (i) (iv)
34. Place the bandwidth required to (C) (ii) (i) (iii) (iv)
transmit data in digital modulation (D) (iii) (iv) (i) (ii)
technique in descending order. 38. List – I List – II
I. 64 QAM II. 16 QAM (a) Trap (i) Interrupt
III. QPSIC IV. BPSIC Acknowledge
(A) I, II, III, IV (B) IV, III, II, I (b) INTR (ii) Direct Memory
Access
(C) II, I, III, IV (D) I, IV, II, III
(c) HOLD (iii) Interrupt Request
(d) INTA (iv) Highest Priority
35. The decreasing order of propagation
Interrupt
delay in logic families is
Codes are :
I. RTL II. CMOS (a) (b) (c) (d)
III. ECL IV. TTL (A) (iii) (i) (ii) (iv)
(B) (iv) (iii) (ii) (i)
(A) I, II, IV, III (B) I, II, III, IV
(C) (iv) (ii) (i) (iii)
(C) I, III, IV, II (D) I, III, II, IV (D) (ii) (iii) (iv) (i)
J-88-11 5 Paper-II
Text of page 6
39. List – I List – II 42. List – I List – II
(a) Boolean (i) Minimization
(a) Lower m2 Algebra
Side Band (i) PC 1 +
2 (b) K-Map (ii) Synchronous
(b) Upper (ii) fc – fs circuits
(c) Clock (iii) Error correction
Side Band (d) Parity (iv) De Morgan’s
(c) Bandwidth (iii) fc + fs theorem
Codes are :
(d) Power in (iv) Twice the (a) (b) (c) (d)
AM signal (A) (iv) (i) (ii) (iii)
frequency (B) (iv) (iii) (ii) (i)
(C) (iii) (iv) (ii) (i)
Codes are : (D) (iii) (ii) (iv) (i)
(a) (b) (c) (d) 43. List – I List – II
(A) (ii) (iii) (iv) (i) (System) (Order of
(B) (iii) (ii) (iv) (i) Frequency)
(a) Optical fiber (i) 4 to 6
(C) (ii) (iv) (i) (iii) communication GHz
(D) (iii) (iv) (i) (ii) (b) Mobile (ii) 88-108
communication MHz
(c) FM (iii) 900-1800
40. List – I List – II Broadcasting MHz
(a) Rectifier (i) 81.2 % (d) Satellite (iv) 1014 Hz
(b) Fullwave (ii) 40.6 % communication
Codes are :
Rectifier (a) (b) (c) (d)
(c) Halfwave (iii) 4 diodes (A) (iv) (iii) (ii) (i)
Rectifier (B) (iii) (iv) (i) (ii)
(d) Bridge (iv) AC to DC (C) (iv) (i) (ii) (iii)
(D) (iv) (ii) (iii) (i)
Rectifier
44. List – I List – II
Codes are : (a) n-channel (i) Reverse bias
(a) (b) (c) (d) JFET is increases along
(A) (iv) (ii) (i) (iii) better than the channel
(B) (iii) (iv) (i) (ii) p-channel
JFET
(C) (iii) (iv) (ii) (i) (b) channel is (ii) High electric
(D) (iv) (i) (ii) (iii) wedge field near the
shaped drain and
41. List – I List – II directed towards
the source
(a) Splicing (i) Microwave (c) channel is (iii) Low leakage
oscillator not current at gate
(b) PCM (ii) Relaxation completely terminal
oscillator closed at
pinch-off
(c) Gunn diode (iii) Quantization (d) Input (iv) Better frequency
(d) UJT (iv) Optical Fiber impedance performance
Codes are : is high since µn>>µp
(a) (b) (c) (d) Codes are :
(A) (iii) (iv) (i) (ii) (a) (b) (c) (d)
(B) (ii) (i) (iv) (iii) (A) (iv) (ii) (i) (iii)
(B) (iv) (i) (ii) (iii)
(C) (iv) (iii) (i) (ii) (C) (iii) (i) (ii) (iv)
(D) (ii) (iii) (iv) (i) (D) (iii) (ii) (i) (iv)
Paper-II 6 J-88-11
Text of page 7
45. List – I List – II antennas incorporate the paraboloid
(a) Pointers (i) FORTRAN reflector in their construction. Other
(b) Object (ii) DO LOOPS microwave antennas are horns and lenses.
oriented A horn is an ideal for terminating a
programming waveguide and may be conical,
(c) High level (iii) C++ rectangular or sectorial. Dielectric lenses
language act on microwave radiation as do ordinary
(d) Recursion (iv) C lenses on light. Wide band antennas are
Codes are : required either when the transmissions
(a) (b) (c) (d) themselves are wideband or when working
(A) (ii) (i) (iv) (iii) of narrow channel over a wide frequency
(B) (ii) (iii) (iv) (i) range. Horns, the folded dipole and
(C) (iv) (iii) (ii) (i) rhombic all have good broad band
(D) (iv) (iii) (i) (ii) properties small loop antennas are often
used for direction finding.
Read the passage below and answer the
questions 46 to 50 that follows based on 46. An ungrounded antenna near the
your understanding of the passage : ground
(A) acts as a single antenna of
An antenna is generally metallic twice the height.
object, often a wire or collection of wires (B) is likely to need an earth mat.
used to convert high frequency current into (C) acts as an antenna array.
electro-magnetic waves and vica-versa. (D) must be horizontally polarised.
Transmitting and receiving antenna
47. One of the following is very useful
behaves identically. One of the important
as a multiband HF receiving antenna.
comparison antenna is the isotropic
This is the
antenna. Directive gain of the antenna is a
(A) Conical Horn
ratio comparing power density generated
(B) Folded Dipole
by a practical antenna in some direction.
(C) Log-Periodic
An antenna has two bandwidths, both
(D) Square Loop
measured between half power points.
Because the electro-magnetic waves 48. Which of the following antenna is
radiated by the antenna have the electric best excited from waveguide ?
and magnetic vectors at right angle to each (A) Biconical (B) Horn
other and the direction of propagation is (C) Helical (D) Discone
said to be polarized. Simple antenna may
thus be horizontally or vertically polarised. 49. Indicate the antenna that is not
More complex antennas may be circularly wideband.
or elliptically polarised. For grounded (A) Discone
vertical dipoles operated at frequencies (B) Folded Dipole
(C) Helical
upto the MF, the optimum effective height (D) Marconi
is just over a half-wavelength.
The Yagi-Uda antenna employ a 50. An antenna that is circularly
folded dipole and parasitic elements to polarized is
obtain reasonable gain in the HF and VHF (A) Helical
ranges. High gain and narrow bandwidths (B) Small circular loop
are especially required of microwave (C) Parabolic reflector
antennas. Large number of microwave (D) Yagi-Uda
J-88-11 7 Paper-II
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Space For Rough Work
D-0109
Paper-II 8 P.T.O.
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Source: University Grants Commission. Question paper published by University Grants Commission.