Ugc net solutions at target ies

Solutions: Click Here
Quiz & Solution for UGC NET Electronics Science Exams
About the NET

The National Educational Testing Bureau of University Grants Commission (UGC)
conducts National Eligibility Test (NET) to determine eligibility for lectureship and
for award of Junior Research Fellowship (JRF) for Indian nationals in order to
ensure minimum standards for the entrants in the teaching profession and
research. The Test is conducted in Humanities (including languages), Social
Sciences, Forensic Science, Environmental Sciences, Computer Science and
Applications and Electronic Science.

The Council of Scientific and Industrial Research (CSIR) conducts the UGC-CSIR NET
for other Science subjects, namely, Life Sciences, Physical Sciences, Chemical
Sciences, Mathematical Sciences and Earth Atmospheric Ocean & Planetary
Sciences jointly with the UGC. The tests are conducted twice in a year generally in
the months of June and December. For candidates who desire to pursue research,
the Junior Research Fellowship (JRF) is available for five years subject to
fulfillment of certain conditions. UGC has allocated a number of fellowships to the
universities for the candidates who qualify the test for JRF. The JRFs are awarded
to the meritorious candidates from among the candidates qualifiying for eligibility
for lectureship in the NET. JRFs are available only to the candidates who opt for it
in their application forms.

Lets test your preparation by solving the previous year UGC NET exam question
papers-

1. An electron rising through a potential of 250 V will acquire an energy of :
a. 250 eV
b. 800 eV
c. 250 J
d. 800 J
2. If the amount of impurity, either donor type or acceptor type added to
the intrinsic semiconductor is controlled to 1 part in one million, the conductivity of the
sample :
a. increases by a factor 10e3
b. reduces by a factor 10e-3
c. increases by a factor 10e6
d. reduces by a factor 10e-6
3. The fourier transform of a function on X (t) is X ( f ). The fourier transform of dX ( f )/df will
be :
a. dX ( f )/df
b. j 2p f x ( f )
c. j f x ( f )
d. X ( f )/jf
4. Laplace transform and Fourier integrals are related through :
a. frequency

domain

b. time domain
c. both frequency and time domain
d. none
5. A clamper circuit :
(i) adds or subtracts a dc voltage to or from a waveform
(ii) does not change the shape of the waveform
(iii) amplifies the waveform
a. (i) and (ii) are correct
b. (i) and (iii) are correct
c. (ii) and (iii) are correct
d. (i), (ii) and (iii) are correct
6. The amplifier gain with positive feedback is given by :
a. A/1+Aß

b. A/1-Aß
c. A/1-ß
ß/1-A
7. A ring counter consisting of five flip flop will have :
a. 5 states
b. 10 states
c. 32 states
d. infinite states
8. Which one of the following can be used as parallel to series converter ?
a. Decoder
b. Encoder
c. Digital counter
d. Multiplexer
9. An interrupt in which the external device supplies its address as well as the interrupt
request, is known as :
a. vectored interrupt
b. maskable interrupt
c. polled interrupt
d. non-maskable interrupt
10. In 8085 microprocessor, the value of the most significant bit of the result following the
execution of any arithmetic of Boolean instruction is stored in the :
a. carry status flag
b. auxiliary carry status flag
c. sign status flag
d. zero status flag
11. An instruction that can be recognized and used without translation must be written in :
a. Source code
b. Machine code
c. Basic language
d. Assembly code
12. What is the name of the arrangement where by several central processing units share one
memory ?
a. Multitasking

b. Multiprogramming
c. Multiprocessing
d. Concurrent programming
13. The angle for which there is no reflection and the incident wave is vertically polarized is
known as :
a. Steradian angle
b. Reflection angle
c. Brewster’s angle
d. Critical angle
14. The characteristic impedance of a transmission line is given by :

a.

b.

c.
d.
15. A PLL can be used to demodulate :
a. PAM signals
b. PCM signals
c. PM signals
d. DSB-SC signals
16. The main function of balanced modulator is to :
a. produce balanced modulation of a carrier wave
b. produce 100 percent modulation
c. suppress carrier signal in order to create a single side band or double side band
d. limit noise picked up a receiver
17. An SCR can be termed as :
a. DC switch
b. AC switch
c. Both DC and AC switch
d. Square wave switch

18. Fiber optics communication offers the largest bandwidth in the range of :
a. 10e10
b. 10e6
c. 10e14
d. 10e20
19. Silicon photosensors have their maximum spectral response in the :
a. infrared region
b. ultraviolet region
c. visible region
d. X-ray region

20. Open loop transfer function is given by

the system is ::

a. is stable
b. is unstable
c. is marginally stable
d. is absolutely stable
21. Match List-I with List-II and select the correct
List-I
(a) Zener Diode
(i)
(b) Tunnel Diode
(ii)
(c) Gunn diode
(iii)
(d) PIN diode
(iv)

answer using the codes given below the lists :
List-II
Negative resistance
High current gain
voltage regulation
High input impedance

a. (iii) (i),(ii) (iv) (i)
b (iv) (ii),(iv) (iv) (i)
c. (iv) (i),(iii),(iv) (i) (iii)
d. (iii) (i),(ii),(iv) (iv) (i)
22. Match List-I and List-II and select the correct answer using the codes given below the lists :
List-I
List-II
(a) Venturi tube
(i)
Displacement
(b) Optical tachometer
(ii) Pressure
(c) LVDT
(iii) Flow
(d) Pirani Gauge
(iv) Velocity
a. (i) (iv) (iii) (ii)

b. (iii) (ii) (i) (iv)
c. (i) (ii) (iii) (iv)
d. (iii) (iv) (i) (ii)
23. Match List-I with List-II and select the correct answer using the codes given below the lists :
List-I
List-II
(a) Frequency Modulation
(i) Envelop detection
(b) Double sideband suppressed carrier signal (ii) Companding
(c) PCM
(iii)Balance Modulator
(d) Amplitude Modulation
(iv) Pre-emphasis and
deemphasis
a. (i) (ii) (iii) (iv)
b. (i) (ii) (iv) (iii)
c. (iv) (iii) (i) (ii)
d. (iv) (iii) (ii) (i)
List-I
List-II
(With respect to Magnetron
(With respect to Magnetron peak
average o/p power, dyty cycle)
o/p power in Watts)
(a) 25 W
(i)
6250
(b) 50 W
(ii) 5000
(c) 100 W
(iii) 2500
(d) 150 W
(iv) 1250
a. (iv) (iii) (ii) (i)
b. (iii) (iv) (ii) (i)
d. (iv) (iii) (i) (ii)
List-I
List-II
(a)
(b)
(c)
(d)

AND
OR
NOT
NOT EQUAL

a. (ii) (iii) (i) (iv)
b. (iii) (i) (iv) (ii)
c. (iv) (iii) (ii) (i)
d. (i) (ii) (iii) (iv)

(i)
(ii)
(iii)
(iv)

||
=!
&&
!

List-I
List-II
(Status flag w.r.t 8085)
(Bit position)
(a) Auxillary carry
(i)
7
(b) Gign
(ii) 6
(c) Zero
(iii) 4
(d) Parity
(iv) 2
a. (i) (ii) (iii) (iv)
b. (ii) (iii) (i) (iv)
d. (iii) (i) (iv) (ii)
List-I
List-II
(a)
(b)
(c)
(d)

Solar Cell
LED
Laser
Reflex Klystron

(i)
(ii)
(iii)
(iv)

Spontaneous emission
Stimulated emission
Photovoltaic conversion
Velocity modulation

a. (iii) (i) (ii) (iv)
b. (i) (ii) (iii) (iv)
c. (ii) (iii) (iv) (i)
d. (iv) (i) (ii) (iii)
List-I
List-II
(a)
(b)
(c)
(d)

ROM
RAM
Magnetic Memory
EPROM

(i)
(ii)
(iii)
(iv)

Volatile memory
Non-volatile memory
Erasable Programmable Read Only Memory
Permanent memory

a. (i) (ii) (iv) (iii)
b. (ii) (i) (iv) (iii)
c. (iii) (i) (ii) (iv)
d. (iv) (iii) (ii) (i)
List-I
List-II
(a) Bit
(b) Byte

(i)
(ii)

16 bit
1 bit

(c) Nibble
(d) 8086

(iii) 4 bit
(iv) 8 bit

a. (ii) (iv) (iii) (i)
b. (i) (iii) (ii) (iv)
c. (iv) (ii) (i) (iii)
d. (iii) (iv) (ii) (i)
List-I
List-II
With respect to copper film
Surface resistance
thickness (A ),resistivity (Ω-cm×10−7)
(Ω / Square)

(a)
(b)
(c)
(d)

100, 0.52
80, 0.58
60, 0.68
40, 0.86

(i)
(ii)
(iii)
(iv)

7.25
21.50
5.20
11.33

a. (ii) (iii) (i) (iv)
b. (iii) (i) (iv) (ii)
c. (iv) (i) (iii) (ii)
d. (i) (ii) (iii) (iv)
31. Assertion (A): Silicon is widely used in IC technology.
Reason (R): Silicon technology is less expensive and SiO2 layer can be easily formed on silicon.
a. Both (A) and (R) true and (R) is the correct explanation of (A)
b. Both (A) and (R) true but (R) is not the correct explanation of (A)
c. (A) is true but (R) is false
d. (A) is false but (R) is true
32. Assertion (A) : The greater the ‘Q’ the smaller the bandwidth of a resonant circuit.
Reason (R) : At high frequencies the ‘Q’ of a coil falls due to skin effect.
33. Assertion (A) : In an Op-Amp circuit when one input terminal of the Op-Amp is grounded,
the other terminal becomes virtual ground.
Reason (R) : Input impedance of the Op-Amp is high.

34. Assertion (A) : Master-Slave JK flip-flop is free from race-around condition.
Reason (R) : Master-Slave uses two JK flip-flops.
35. Assertion (A) : A processor can reference a memory stack without specifying an address.
Reason (R) : The address is always available and automatically updated in the stack pointer.
36. Assertion (A) : Subroutines are used in larger programming.
Reason (R) : Program testing at the program development time will be easier.
37. Assertion (A) : Two cavity Klystron is now-a-days frequently used as microwave amplifier.
Reason (R) : Velocity and current modulation occurs in Klystron
38. Assertion (A) : A half-adder is faster than full adder.
Reason (R) : A half adder gives only one output while a full adder gives two outputs.
39. Assertion (A) : Optical fibers have broader bandwidth to conventional copper cables.
Reason (R) : The information carrying capacity of optical fiber is limited by Rayleigh’s
scattering loss.

40. Assertion (A) : Piezoelectric crystals serve as a source of ultrasonic wave.
Reason (R) : The crystals can generate wave having frequencies greater than 20 kHz.
41. Give sequence of the following interrupts on priority basis from highest to the lowest :
(i) RST 5.5
(ii) RST 6.5
(iii) RST 7.5
(iv) TRAP
a. (i), (ii), (iii), (iv)
b. (ii), (iii), (i), (iv)
c. (iii), (ii), (iv), (i)
d. (iv), (iii), (ii), (i)
42. The highest data rate can be transmitted using the following cables :
(i) Twisted-wire cable
(ii) Co-axial cable
(iii) Fiber-optic cable
a. (iii), (ii), (i)
b. (i), (iii), (ii)
c. (ii), (i), (iii)
d. (i), (ii), (iii)
43. Write down the different computer network from lowest to the highest order :
(i) LAN
(ii) WAN
(iii) MAN
a. (ii), (i), (iii)
b. (iii), (i), (ii)
c. (i), (ii), (iii)
d. (i), (iii), (ii)
44. Consider the following rectifier circuits :
(i) Half-wave rectifier without filter
(ii) Full-wave rectifier without filter
(iii) Full-wave rectifier with series inductance filter
(iv) Full-wave rectifier with capacitance filter

The sequence of these rectifier circuits in decreasing order of their ripple factor is :
a. (iii), (iv), (i), (ii)
b. (i), (iv), (iii), (ii)
c. (iii), (ii), (i), (iv)
d. (i), (ii), (iii), (iv)
45. What is the correct sequence of the following steps for fabrication of monolithic, bipolar
junction transistor ?
(i) Emitter diffusion
(ii) Base diffusion
(iii) Buried layer formation
(iv) Epilayer formation
a. (iii), (iv), (i), (ii)
b. (iv), (iii), (i), (ii)
c. (iii), (iv), (ii), (i)
d. (iv), (iii), (ii), (i)

Linked Items

[Read the passage below and answer the questions that follow based on your understanding of the
passage]
Cathode ray oscilloscope is an electronic device which gives a visual representation of electrical
quantities such as voltage and current waveforms in an electrical circuit. The name cathode ray is
given because the electron beam was first thought to consists of rays from the cathode. A CRO
consists of the Cathode Ray Tube (CRT), power supplies, time base circuit and deflection voltage
amplifiers. The heart of cathode ray oscilloscope is CRT. Its chief advantage is that it produces the
visual representation directly with extremely high speed because of the high velocity of electrons.
46. The oscilloscope can be considered as a :
a. low impedance instrument
b. high impedance instrument
c. medium impedance instrument
d. infinite impedance instrument
47. Sawtooth waves are used most frequently to move the electron beam in an oscilloscope :
a. back and forth across the screen
b. up and down on the screen
c. back and down on the screen
d. none of the above
48. The deflection sensitivity of a CRT depends inversely on the :

a. length of the vertical deflecting plates
b. distance between screen and deflecting plates
c. deflecting voltage
d. separation between Y plates
49. Two complete signal cycles would be displaced on the screen scope when time period of
the sweep generator is __________ the signal time period.
a. half
b. twice
c. equal
d. thrice
50. An electrostatic cathode ray oscilloscope is a :
a. current indicating device
b. voltage indicating device
c. Both (A) and (B) above
d. None of the above

1. The threshold voltage of an n-channel MOSFET can be increased by :
a. increasing the channel dopoint concentration
b. decreasing the channel dopoint concentration
c. reducing the gate oxide thickness
d. reducing the channel length
2. The potential difference between two points can be expressed as :
a. Volt per meter
b. Watt per ampere
c. Coulomb per Newton
d. Volt per ampere

3. Laplace tarnsform of

is :

a.
b.
c.
d.
4. In a linear network the ratio of voltage excitation to current response is unaltered when
position of excitation and response are interchanged. This assertion stems from :
a. principle of duality
b. principle of superposition
c. reciprocity theorem
d. equivalent theorem
5. The bandwidth of an amplifier can be increased by :
a. decreasing the capacitance of its bypass filter
b. increasing input

signal frequency

c. cascading it
d. minimising its stray capacitance
6. Without the DC source, a clipper acts like a :
a. rectifier
b. clamper

c. demodulator
d. chopper
7. In order to build a mod-6 counter using three flip-flops the number of possible count
sequence is :
a. 4
b. 8
c. 16
d. 28
8. The content of a 4-bit register is 1101. The register is shifted 6 times to the right with serial
input being 101101. The final content of the register will be :
a. 1011
b. 0010
c. 1010
d. 0111
9. A microprocessor with a 16-bit address bus is used in linear memory selection configuration
with 4 memory chips, the maximum addressable memory space is :
a. 64 k
b. 16 k
c. 8 k
d. 4 k
10. The interface chip used for data transmission between 8086 and 16 bit ADC is :
a. 8259
b. 8255
c. 8253
d. 8251
11. The FORTRAN statement A52.5, J55*A22**4/2 will calculate J as :
a. 12
b. 8.5
c. 4.5
d. 4
12. A pointer is a variable that contains as its value :
a. the dimension of another variable
b. the address of another variable

c. the size of another variable
d. the value of another variable
13. An electromagnetic wave travels in free space with electric field
component

. Its angular frequency w is :

a. 3e8 m/s
b. 3e8 rad/s
c. 1.5e8 rad/s
d. 1e8 rad/s
14. The behaviour of which of the following devices is governed by bulk effect :
a. Gunn diode
b. PIN diode
c. Tunnel diode
d. IMPATT diode
15. A frequency modulated signal is expressed as :
a. A cos [ wct1 K m(t) ]
b. A cos [ wct 1ϕ ]
c. A cos [ wct ]
d. A cos [ wct1K ∫m(λ) dλ ]
16. In PCM system if the quantisation levels are increased from 2 to 8, the relative bandwidth
requirement will :
a. become four times
b. remain same
c. be tripled
d. be doubled
17. Optical communication systems generally use :
a. amplitude modulation
b. frequency modulation
c. phase modulation
d. intensity modulation
18. A device that exhibits a negative resistance region is :
a. P-N diode
b. UJT

c. JFET
d. BJT
19. A pyrometer is used to measure :
a. temperature
b. pressure
c. light intensity
d. low current

20. A linear discrete-time system has the characteristic equation

. The system :

a. is stable
b. is marginally stable
c. is unstable
d. assessed
21. Assertion (A): At high temperature, the avalanche breakdown voltage is higher. Reason (R):
At higher temperature mean free paths of electrons and holes are shorter, therefore a larger
field is required to cause ionisation.
22. Assertion (A): The Wien Bridge can be used for frequency measurements. Reason (R): The
Wien Bridge uses only capacitors and resistors.
23. Assertion (A): A demultiplexer cannot be used as a decoder. Reason (R):A demultiplexer is
built using AND gates only.
24. Assertion (A): In Intel 8085, the lower byte of address and data are multiplexed. Reason
(R): This helps limit the number of external pin terminals.

25. Assertion (A): The solution of Poisson equation is the same as the solution of Laplace
equation. Reason (R): The Laplace equation is the same as Poisson equation for source free
region.
26. Assertion (A): The total emf induced in a circuit equals the time rate of change of the
total magnetic flux linking the circuit. Reason (R): The induced current in a loop is always so
directed as to produce a flux opposing the change in the flux density.
27. Assertion (A): AM has better noise performance than FM. Reason (R): AM results in increase
in signal power.
28. Assertion (A): Optical communication has shifted from 1.3 mm to 1.55 mm in silica fibers.
Reason (R): Dispersion and attenuation are both minimum at 1.55 mm.
29. Assertion (A): Thyristors are preferred to power diodes in variable power rectifiers. Reason
(R): Thyristors provide controlled rectification and also power loss in them is less compared to
that in power diodes.

30. Assertion (A): An important property of laser radiation is its coherence. Reason (R):
Stimulated emission is the key to the operation of LASER.
31. Consider the following semiconductor diodes : 1. Germanium diode 2. Silicon diode 3.
Tunnel diode 4. Schottky diode The correct increasing order of forward voltage drop of the
above diodes is :
a. 1, 3, 4, 2
b. 1, 2, 3, 4
c. 3, 4, 2, 1
d. 3, 1, 4, 2
32. In the microwave region some of the band designations are Ku, X, K and Ka. The order
according to their allocated frequency band is :
a. Ku, X, K, Ka
b. X, Ku, K, Ka
c. Ka, Ku, K, X
d. K, X, Ku, Ka
33. Consider the Analog to Digital converters given below : 1. Successive approximation ADC 2.
Dual Ramp ADC 3. Counter method ADC 4. Simultaneous ADC The correct sequence of the
ascending order in terms of conversion times of the above ADC’s is
a. 3, 2, 4, 1
b. 2, 3, 4, 1
c. 2, 3, 1, 4
d. 3, 2, 1, 4
34. The various subsystems in an FM receiver are arranged as : 1. Mixer, RF amplifier, limiter,
IF amplifier, discriminator, audio amplifier 2. RF amplifier, mixer, IF amplifier, limiter,
discriminator, audio amplifier 3. RF amplifier, mixer, limiter, discriminator, IF amplifier, audio
amplifier 4. Mixer, IF amplifier, limiter, audio amplifier, discriminator, RF amplifier The
correct sequence of subsystems is :
a. 1
b. 2
c. 3

d. 4
35. Four main types of telephone exchanges available in India are : 1. Manual 2. Electronic 3.
Strowger 4. Cross-bar The correct order in which they appeared in our country is :
a. 1, 2, 3, 4
b. 2, 1, 4, 3
c. 1, 3, 4, 2
d. 1, 4, 3, 2
36. Match the List-I with List-II :
List-I
(a) BJT
(b) MOSFET
(c) Tunnel Diode
(d) Zener Diode

List-II
(i)
Negative resistance
(ii) High current gain
(iii) voltage regulation
(iv) High input impedence

a. (i)(ii)(iii)(iv)
b. (ii)(iv)(i)(iii)
c. (iv)(iii)(ii)(i)
d. (iii)(i)(ii)(iv)
List-I
(a) Linearity
(b) Structure
(c) Equivalent circuit
(d) Bilateral

List-II
(i)
Superposition theorem
(ii) Norton's theorem
(iii) Tellegen's theorem
(iv) Reciprocal theorem

a. (iii)(ii)(iv)(i)
b. (iv)(i)(ii)(iii)
c. (i)(ii)(iii)(iv)
d. (i)(iii)(ii)(iv)
List-I
(a) Wein bridge
capacitance
(b) Colpitt
and 1 inducatnce
(c) Hartley
(d) Clapp
inductance
a. (i)(ii)(iii)(iv)

List-II
(i)
RF Oscillator: 2 inductance and 1
(ii)

LC Oscillator for RF: 3 capacitance

(iii) RC Oscillator for audio frequecy
(iv) RF Oscillator: 2 capacitor and 1

b. (iv)(iii)(ii)(i)
c. (ii)(iii)(iv)(i)
d. (iii)(iv)(i)(ii)
List-I
(a) Multiplexer
(b) Demultiplexer
(c) Shift Register
(d) Encoder
input

List-II
(i)
Sequential memory
(ii) Converts decimal to binary
(iii) Data selector
(iv) Routes out many output with single

a. (i)(ii)(iii)(iv)
b. (iv)(iii)(ii)(i)
c. (iii)(iv)(i)(ii)
d. (ii)(i)(iv)(iii)
List-I
(a) Sign flag
(b) Zero flag
(c) Parity flag
(d) Carry fla

List-II
(i)
7th bit
(ii) 8th bit
(iii) 1 bit
(iv) 3rd bit

a. (ii)(i)(iv)(iii)
b. (i)(ii)(iii)(iv)
c. (iv)(ii)(i)(iii)
d. (iii)(iv)(i)(ii)
List-I
(a) Pointer
(b) Dimension
(c) Header
(d) FLOAT

List-II
(i)
C Program
(ii) Array
(iii) Real variable
(iv) Memory address

a. (i)(ii)(iii)(iv)
b. (iv)(ii)(i)(iii)
c. (iii)(iv)(i)(ii)
d. (ii)(i)(iv)(iii)
List-I

List-II

(a)
field
(b)
(c)
(d)

(i)

(ii)

Gauss' law for electric

Ampere's law

(iii) Faraday's law
(iv)

Gauss' law for magnetic field

a. (i)(ii)(iii)(iv)
b. (iv)(i)(iii)(ii)
c. (iii)(iv)(ii)(i)
d. (ii)(iii)(i)(iv)
List-I
(a) AM Broadcast
(b) FM Broadcast
(c) TV Broadcast
(d) Point to Point

List-II
(i)
Multipath phenomenon
(ii) 535 - 1600 KHz
(iii) VSB modulation
(iv) 88 - 108 MHz

a. (i)(ii)(iii)(iv)
b. (iii)(iv)(ii)(i)
c. (ii)(iv)(iii)(i)
d. (i)(iii)(iv)(ii)
List-I
(a) LDVT
(b) Bourdon gauge
(c) Strain gauge
(d) Thermister

List-II
(i)
Pressure
(ii) Temperature
(iii) Displacement
(iv) Stress

a. (i)(ii)(iii)(iv)
b. (iii)(i)(iv)(ii)
c. (iv)(i)(iii)(ii)
d. (ii)(i)(iv)(iii)
List-I
(a) Polarisation
(b) Coherence

List-II
(i)
Bandwidth
(ii) LCD

(c) Total internal reflection (iii) Laser
(d) Dispersion
(iv) Optical fiber
a. (ii)(iii)(iv)(i)
b. (i)(ii)(iii)(iv)
c. (iv)(iii)(ii)(i)
d. (ii)(i)(iii)(iv)

Linked Items
passage] In 1990 Planck proposed, in order to explain the distribution of energy in the spectrum of
black body, that an oscillating electron may not radiate or absorb energy continuously, as required
by classic electrodynamics, but only in integer multiples of a fundamental unit called quantum. If f
is the frequency of radiation, the energy of a quantum is given by E = hv where h is a constant
known as Planck's constant. In 1905, Einstine went further and suggested that light, or
electromagnetic radiation in general, might sometimes be regarded having a corpuscular or particle
like nature. The light particles, or quanta, are called photons. Photons are peculiar in that they
travel with the speed of light and have zero rest mass. What is important to notice is that can be
thought of either as waves with particle like properties or as particles with wave like properties. In
1924 de Broglie generalised the idea and suggested that any moving particles with mass m and
speed v, will in some experiments display wave like properties with wavelength = h/mv.
46. A quantum of visible light is called :
a. Photon
b. Proton
c. Hyperon
d. Phonon
47. A quantum will have more energy if :
a. the wavelength is longer
b. the frequency is higher
c. the amplitude is higher
d. the velocity is greater
48. The photon has its velocity in vacuum equal to :
a. 3e9 cm/s
b. 3e10 cm/s
c. 3e10 km/s
d. 9e10 cm/s

49. For an electron moving with a speed of 5.9e8 cm/sec, the accompanying wave will have a
wavelength of :
a. 1.2e-8 cm
b. 1.2e-10 cm
c. 1.2e-6 cm
d. 1.2e-12 cm
50. The electron microscope works on the basis of :
a. refraction of light in lenses
b. wave like properties of electron in motion
c. pressure exerted by electron beam
d. Production of electromagnetic wave by impact of electrons on matter.

1. Light falls on one end of a long open-circuited n-type semiconductor bar for low level
injection the hole current is predominantly to :
a. Drift
b. Diffusion
c. Both drift and diffusion
d. Length of bar
2. Under high electric fields, in a semiconductor with increasing electric field :
a. The mobility of charge carriers decreases and saturates
b. The mobility of charge carriers increases.
c. The Velocity of charge carrier increases.
None of the above
3. The action of JFET in its equivalent circuit can be represented by :
a. Current controlled current source
b. Current controlled voltage source
c. Voltage controlled current source
d. Voltage controlled voltage source

4. The function

is said to have :

a. even symmetry
b. odd symmetry
c. halfwave symmetry
d. quarterwave symmetry

5. The Laplace transform of

is equal to :

a.

b.
c.

d.
6. A heat sink is generally used with a transistor to :

a. increase the forward current
b. decrease the forward current
c. compensate for excessive doping
d. prevent excessive temperature rise
7. The 555 timer can be employed in : (1) A monostable multivibrator (2) A bistable
multivibrator (3) An astable multivibrator Of these statements
a. 1 & 2 are correct
b. 1 & 3 are correct
c. 2 & 3 are correct
d. 1, 2 & 3 are correct
8.A toggle operation is used :
a. with a gate circuit
b. with a flip-flop
c. without a flip-flop
d. with a counter
9. A multiplexer : (1) selects one of the several inputs and transmits to a single output (2)
routes the data from a single input to one of many inputs (3) converts parallel data into serial
data (4) is a combination circuit. Of these statements
a. 1, 2 & 4 are correct
b. 2, 3 & 4 are correct
c. 1, 3 & 4 are correct
d. 1, 2 & 3 are correct
10. Intel 8085 supports :
a. only isolated input output
b. only memory mapped input output
c. isolated input output and memory mapped input output
d. none of these
11. An I/O processor control the flow of information between :
a. Cache memory and I/O devices
b. main memory and I/O devices
c. two I/O devices
d. cache and main memories
12. In 8085, TRAP is :

a. always maskable
b. cannot interrupt a service subroutine
c. used for catastrophic events like temporary power failure
d. lowest priority interrupt
13. Which of the following is not a high level computer programming language ?
a. FORTRAN
b. MODED
c. COBOL
d. C++ language
14. Which microwave tube uses buncher and catcher cavities :
a. Magnetron
b. Klystron
c. Reflex Klystron
d. Tunneling wave tube
15. When a plane wave propagating through free space, the direction of the field : (A) E is
perpendicular to the direction of propagation (B) H is perpendicular to the direction of
propagation (C) E is perpendicular to the direction of the field H . Which is correct ?
a. 1 and 2
b. 2 and 3
c. 1 and 3
d. 1, 2 and 3
16. Given a carrier frequency of 100 KHz and a modulating frequency of 5 KHz the band width
of AM transmission is :
a. 5 KHz
b. 200 KHz
c. 10 KHz
d. 20 KHz
17. A PAM signal can be detected by using :
a. an ADC
b. an integrator
c. a bandpass filter
d. a highpass filter
18. Which of the following semiconductor device acts like a diode and two resistor ?

a. Triac
b. Diac
c. SCR
d. UJT
19. In a thyristor, anode current is made up of :
a. Electrons only
b. Holes only
c. both electrons and holes
d. none of these
20. Which of the following semiconductor device acts like a diode and two resistor ?
a. speed
b. high voltage
c. transmission losses
d. micro wave power
21. A piezoelectric transducer converts :
a. Pressure to voltage
b. Pressure to velocity
c. displacement
d. vibration to kinetic energy
22. A LVDT has :
a. one primary coil and two secondary coils
b. two primary coils and one secondary coil
c. one primary coil and one secondary coil
d. two primary coils and two secondary coils
23. A strain gauge is a transducer which will convert :
a. Pressure into temperature
b. Pressure into velocity
c. Pressure into change of resistance
d. force into displacement
24. CMRR (Common Mode Rejection Ratio) for a differential amplifier should be :
a. Zero
b. Unity

c. Small
d. Large
25. Which of the following diode is used for frequency tuning ?
a. Varactor diode
b. Zener diode
c. Tunnel diode
d. Gunn diode
List-I
(a)
(b)
(c)
(d)

BJT
FET
Varactor diode
Tunnel diode

List-II
(i)
(ii)
(iii)
(iv)

Pinch off effect
Frequency tuning
Negative resistance
Punch through effect

(i)
(ii)
(iii)
(iv)

List-II
Produces deflecting torque
Provides base for the coil
Makes the magnetic field radia
Provides controlling torque

a. (i)(iii)(ii)(iv)
b. (i)(ii)(iii)(iv)
c. (iv)(i)(ii)(iii)
d. (i)(iv)(iii)(ii)

(a)
(b)
(c)
(d)

List-I
Former
Coil
Core
Springs

a. (i)(ii)(iii)(iv)
b. (i)(ii)(iv)(iii)
c. (ii)(i)(iii)(iv)
d. (ii)(i)(iv)(iii)
List-I
(a) Passive Network
circuit
(b) Active Network
passive circuit
(c) Lumped Network
energy

List-II
(i) Contains electrically separable passive
(ii) Contains electrically inseparable
(iii) Contains circuit elements without

(d) Distributed Network
sources

(iv) Contains circuit elements with energy

a. (iii)(iv)(i)(ii)
b. (i)(ii)(iii)(iv)
c. (ii)(i)(iv)(iii)
d. (iv)(i)(ii)(iii)
List-I
(a) Flip-Flop can be used as latch
(b) Flip-Flop can be used as delayed
Flop
(c) Flip-Flop does not have race problem
(d) Flip Flop can be used as shift registers

List-II
(i) D Flip-Flop
(ii) Master-slave Flip(iii)
(iv)

JK Flip-Flop
RS Flip-Flop

a. (iv)(i)(ii)(iii)
b. (ii)(iv)(i)(iii)
c. (i)(iii)(ii)(iv)
d. (iii)(i)(iv)(ii)
List-I
List-II
(a) Parallel comparator
(i) Null balancing type
(b) Successive approximation (ii) Faster converter
(c) Dual slope
(iii) Voltage dependent conversion type
(d) Counter type
(iv) Integrating type
a. (ii)(i)(iii)(iv)
b. (ii)(i)(iv)(iii)
c. (i)(ii)(iv)(iii)
d. (i)(ii)(iii)(iv)
List-I
List-II
(a) Frequency modulation
(i) Envelop detection
(b) Double sideband
(ii) Companding
suppressed signal carrier
(c) PCM
(iii) Balance modulator
(d) Amplitude modulation
(iv) Pre-emphasis and de emphasis
a. (i)(ii)(iii)(iv)
b. (i)(ii)(iv)(iii)
c. (iv)(iii)(i)(ii)

d. (iv)(iii)(ii)(i)
List-I
(a) RC coupling
matching
(b) Inductive coupling
signals
(c) Transformer coupling
(d) Direct coupling
used

List-II
(i) High voltage gain and impedance
(ii) Ability to amplify dc and low frequency
(iii) Minimum possible non-linear distortion
(iv) Low collector supply voltage can be

a. (iv)(i)(iii)(ii)
b. (iii)(iv)(i)(ii)
c. (i)(ii)(iii)(iv)
d. (iv)(iii)(ii)(i)
List-I
(a) LASER
(b) Solar cell
energy
(c) Photo diode
(d) LED

List-II
(i) Emits light of low intensity
(ii) Converts light energy into electrical
(iii) Deliver powers to load
(iv) Emits light of high intensity

a. (iv)(iii)(i)(ii)
b. (iii)(iv)(ii)(i)
c. (iv)(iii)(ii)(i)
d. (iii)(iv)(i)(ii)

(a)
(b)
(c)
(d)

List-I
Single mode optical fiber
(i)
Multi mode optical fiber
(ii)
Graded index optical fiber
(iii)
Simple glass rod optical fiber (iv)

a. (i)(iii)(ii)(iv)
b. (iii)(i)(iv)(ii)
c. (ii)(iv)(iii)(i)
d. (iv)(iii)(ii)(i)

List-II
data rate is highest
data rate is medium
data rate is lowest
data transfer not possible

(a)
(b)
(c)
(d)

List-I
LVDT
Bourdon gauge
Strain gauge
Thermistor

(i)
(ii)
(iii)
(iv)

List-II
Pressure
Temperature
Displacement
Stress

a. (iv)(iii)(ii)(i)
b. (iii)(ii)(i)(iv)
c. (iv)(i)(iii)(ii)
d. (iii)(i)(iv)(ii)
36. Assertion (A) : If a semiconductor is placed in a transverse magnetic field B and an electric
field E is applied across its other two faces, then it would produce an electric current I in the
direction perpendicular to both B and E
Reason (R) : Hall coefficient is proportional to the mobility of charge carriers in the
semiconductor.
37. Assertion (A) : The Wein bridge can be used for frequency measurement.
Reason (R) : The Wein bridge uses only capacitors and resistors.
38. Assertion (A) :R-2R ladder type D/A converter has a higher speed of conversion than a
weighted resistance D/A convertor.
Reason (R) : R-2R ladder type D/A converter uses a smaller number of components than the
weighted resistance D/A converter.
39. Assertion (A) : Bistable multivibrator can be used as flip flop.
Reason (R) : It has two stable states.

40. Assertion (A) : Reflex klystron is made up of a single cavity.
Reason (R) : Velocity modulation occurs in the cavity.
41. Assertion (A) : Optical fibers have broader bandwidth to conventional copper cables.
Reason (R) : The information carrying capacity of optical fibers is limited by Rayleigh scattering
loss.
42. Assertion (A) :A monostable multivibrator can be used to alter the pulse width of a
repetitive pulse train.
Reason (R) : Monostable multivibrator has a single stable state.
43. Assertion (A) : Radio and television receivers are generally of the superheterodyne type.
Reason (R) : Wireless communication is possible by receiving signals through super heterodyne
receivers.
44. Assertion (A) :A half-adder is faster than full adder.
Reason (R) : A half adder gives only one output while a full adder gives two outputs.
45. Assertion (A) : Stimulated emission is the key to the operation of LASER.
Reason (R) : An important property of LASER radiation is its coherence, under which is meant
the correlation between the phases of oscillation at different positions in space and at various
moments of time.


Linked Items
passage] Michael Faraday was one of the greatest of all scientific researchers. In 1845 he observed
experimentally a relationship between electromagnetism and light. Twenty years later James Clerk
Maxwell published "A Dynamical theory of the Electro-magnetic field". Starting with four basic
relationship known as Maxwell's equations, he proved mathematically that electromagnetic waves
could propagate through a nonconducting medium. He predicted a value of wave velocity. In early
1880 s Heinrich Hertz succeeded in verifying Maxwell's theory of electromagnetic wave through a
brilliant series of experiments. The first application of electromagnetic waves was in the field of
communications. The major contribution in this respect came from Sir Jagdish Chandra Bose of
Calcutta, India and Guglielmo Marconi of Italy around 1895. Sir Jagadish Chandra Bose more than a
century ago generated millimeter wave by using Galena detector. With the invention of telegraphy
by Samuel Morse in 1844 and telephone by Bell and Gray in 1876, a more detailed study of
electrical signals on transmission lines was needed. Thanks to the pioneering work of Barkhausin
and Kurz on positive -grid oscillators (1919), and Hull on smooth-bore magnetron (1921), reliable
microwave sources became a reality. A tube with 20 watts output at 3 GHz was constructed by
British Scientists in 1936. A year later, the Varlan brothers at Stanford conceived the idea of
velocity modulation of an electron beam. Microwave tube development in the forms of travelling
wave tube and Reflex Klystron in 1930 s was given great impetus by the threatening war clouds over
Europe precipitated by events surrounding world war II. The early 1960 s saw the emergence of
Microwave integrated circuits and solid state microwave sources. The pioneering efforts of J.B.
Gunn, W.T.Read, B.C. Deloach and many others led to the successful development of Gunn effect
and Impatt type oscillators. Gunn diode is based on Gunn effect and an useful microwave source of
power in the frequency range of 1 GHz to 30 GHz. Gunn diode exibits NDM due to transferred
electron effect. With the development of satellite communication, microwave relay stations and
further growth in commercial and military radars, microwave technology turned out to be billiondollar industry. The International MTT symposium and the Transactions of the MTT are the major
sources of information on development in the theory and practice of microwave engineering.
46. Four basic relationships known as Maxwall's equation do not contain the following law :
a. Gauss law
b. Ampere's law
c. Faraday's law
d. Non existance of magnetic monopoles
47. Microwave frequency extends from :
a. 0.1 GHz to 100 GHz
b. 1 GHz to 30 GHz
c. 1 GHz to 300 GHz

d. 50 MHz to 1000 GHz
48. Millimeter wave was demonstrated by Sir J.C Bose using a solid state detector. This
detector was made of :
a. Silicon
b. Germanium
c. Galena
d. Carbon
49. The idea of velocity modulation of an electron beam was used to construct :
a. Gunn diode
b. Reflex klystron
c. Magnetron
d. Carcinotron
50. Gunn diode is based on :
a. Impact ionization and avalanche multiplication effect
b. Transferred electron effect
c. Velocity modulation effect
d. Current modulation effect

Ugc net solutions at target ies

Recomendados

Recomendados

Mais conteúdo relacionado

Mais procurados

Mais procurados (20)

Semelhante a Ugc net solutions at target ies

Semelhante a Ugc net solutions at target ies (20)

Mais de neeraj7svp

Mais de neeraj7svp (9)

Último

Último (20)

Ugc net solutions at target ies