STAFF SELECTION BOARD
ENGINEERING ASSISTANT AND TECHNICIAN
IN PRASAR BHARATI
This booklet contains 200 questions in all comprising the
following three parts:
Part (a) : General Intelligence and
Reasoning (50 Questions)
Part (b): General awareness (50 Questions)
Part (C) : Technical Knowledge (100 questions)
PART (C) :
TECHNICAL KNOWLEDGE
1. Cloudy
nights are generally warmer than clear ones. Which one of the following could
be the reasons ?
a) Clouds
have high thermal conductivity
b) Clouds
do not radiate heat
c) Clouds
have low thermal conductivity
d) Clouds
do not absorb heat
2. If a
mixture of 1.00 g each of H2 and He exerts a total pressure of 0.48 atm,
what is the ratio of the partial pressures of hydrogen to helium ?
a) 3
b) 0.5
c) 1
d) 2
3. An
electron travelling horizontally from north to south enters a region where a
uniform electric fields is directed downward. What is the direction of the
electric force exerted on the electron once it has entered the field ?
a) To
the west
b) Downward
c) Upward
d) To
the east
4. If
the electric field at a distance r away form charge Q is 36 N/C, what is the
ratio of the electric fields at r, 2r and 3r ?
a) 36:
18:9
b) 36:9:4
c) 9:3:1
d) 36:18:12
5. What
is the linear distance between the sixth and eight maxima on the screen ? the
wavelength z is 550 mn, the slits are separated by 0.14 mm, and the screen is
70 cm form the slits.
a) 2.75
mm
b) 55
mm
c) 5.5
mm
d) 5 mm
6. A
source of sound of frequency 400 Hz is placed inside water. If the velocities
of sound in water and air are 1500 m/s and 330 m/s respectively, what is the
frequency of sound received by an observer standing in air ?
a) 2000
Hz
b) 80
Hz
c) 400
Hz
d) 800
Hz
7. If
the average kinetic energy of oxygen molecule is ‘E; at 300 K, them that of
hydrogen molecule at the same temperature is
a) E/2
b) E
c) E/16
d) E/8
8. For
molecules with a centre of symmetry, transitions that are allowed in the
infrared are forbidden in Raman spectra and vice-versa. This rule is called as
a) Rule
of incoherence
b) Rule
of mutual exclusion
c) Rule
of inversion
d) Pauli’s
exclusion principle
9. Transmission
grating is used to determine
a) Polarization
of light
b) Intensity
of light
c) Hyperfine
structure
d) Wavelength
of light
10. The
reactance of a capacitance at 50 Hz is 5 ohms. What is the reactance at 200 Hz
?
a) 20
ohms
b) 2.0
ohms
c) 1.25
ohms
d) 12.5
ohms
11. A
stationary observer heard the frequency of whistling sound of a moving train as
420 Hz and 350 Hz when it moves towards and away form him respectively. If the
velocity of sound is 300 m/s, then the speed of the train is
a) 75
m/s
b) 25
m/s
c) 50
m/s
d) 40
m/s
12. If a
metal rod of length ‘l’ and diameter ‘d’ is clamped at one end and twisted at
the other end by applying a couple, then the couple per unit twist is directly
proportional to
a)
l-2
b)
l4
c)
d2
d)
d4
13. If germanium is doped with boron and silicon
is doped with indium, then
a) They
are p-type and n-type semiconductors respectively
b) Both
are p-type semiconductors
c) Both
are n-type semiconductors
d) They
are n-type and p-type semiconductors respectively
14. Hydrogen
bomb is a device which makes use of the principle of
a) Nuclear
fission
b) Chemical
reaction
c) Nuclear
fusion
d) Nuclear
reaction
15. The
grade of service is measured in
a) Fractional
number
b) Logarithmic
number
c) Percentage
d) Number
16. Quantization
noise occurs in
a) PWD
b) PCM
c) TDM
d) FDM
17. Which
of the following frequencies is likely to be associated with AM radio broadcast
?
a) 10
GHz
b) 1000
kHz
c) 100
MHz
d) 500
MHz
18. Polarization
of radio wave is determined by
a) The
gain of the antenna
b) The
directivity of the antenna
c) The
direction of the magnetic flux lines with respect to the surface of the earth
d) The
direction of the electric flux lines with respect of the surface of the earth.
19. The
amplitude of an audio signal is 10 and that of the carrier wave is 50.
Percentage modulation is
a) 50
b) 0.2
c) 10
d) 20
20. The
VSB signal is produced from the DSB signal by employing
a) High
frequency modulation
b) Simple
filter
c) Balanced
modulator
d) Ring
modulator
21. A
parabolic antenna is commonly used at
a) 500
MHz
b) 50
Hz
c) 500
kHz
d) 50
MHz
22. The
dominant mode in a rectangular waveguide is
a) TM11
b)
TE01
c)
TM01
d) TE10
23. Amplitude limiter is not essential in the following
detector :
a) Ratio
detector
b) Foster
– seeley discriminator
c) Balanced
slope discriminator
d) Single
slope detector
24. Armstrong
modulator generates
a) PM
b) AM
c) SSB
d) FM
25. If
the FM has modulation index large compared to one radian, that yields
a) Phase
deviation
b) Narrow
band FM
c) Wide
band FM
d) Phase
modulation
26. Spectral
density of white noise
a) Varies
with frequency and bandwidth
b) Varies
with frequency
c) Is
constant
d) Varies
with bandwidth
27. Microwave
signals transmitted towards the sky are
a) Transmitted
through the ionosphere
b) Unable
to reach the ionosphere
c) Strongly
reflected by the ionosphere
d) Strongly
absorbed by the ionosphere
28. The
device used as optical detector is
a) LCD
b) LED
c) LASER
d) PIN
photodiode
29. The
frequency associated with short wave I (SW I) are
a) 25
to 34 MHz
b) 1.6
to 4.5 MHz
c) 4.5
to 16 MHz
d) 16
to 25 MHz
30. Video
transmission in TV broadcast is usually on
a) SM
b) AM
c) FM
d) PM
31. Electric
wire size is expressed in SWG. SWG stands for
a) Standard
Wire Gauge
b) Short
Wire Gauge
c) Stranded
Wire Gauge
d) Sealed
Wire Gauge
32. In a
current carrying conductor, Biot –savart law is used to determine
a) S
b) B
c) H
d) MMF
33. The
average value of sinusoidal voltage signal is given by
a) 0.0637
Vm
b) 0.318
Vm
c) 0.0318
Vm
d) 0.637
Vm
34. For
ceiling fans the single-phase motors generally used are
a) Capacitor
start and run type
b) Resistor
split phase type
c) Permanent
split capacitor type
d) Capacitor
start type
35. If
the iron core form the electromagnet is removed, then the inductance of the
electromagnet will
a) May
increase or decrease
b) Increase
c) Decrease
d) Remain
the same
36. Which
of the following materials has negative temperature coefficient of resistance ?
a) Carbon
b) Copper
c) Brass
d) Lead
37. The
range of voltmeter and ammeter can be increase respectively by
a) Connecting
low value of series resistance and high value of shunt resistance
b) Low
value of parallel resistance and high value of series resistance
c) High
value of series resistance and low value of parallel resistance
d) Using
series capacitor and series inductor
38. If
the power gain of an amplifier is P, and the voltage gain is Q, the current
gain will be
a) PQ
b) P+Q
c) P/Q
d) Q/P
39. The
number of comparators in a 4-bit flash ADC is
a) 16
b) 4
c) 5
d) 15
40. A
ring counter consisting of five flip-flop will have
a) Infinite
states
b) 5
states
c) 10
states
d) 32
states
41. Many
organizations with their offices in different countries of the world connect
their computers through telecommunication satellites and telephone lies such a
network is called
a) ECONET
b) LAN
c) WAN
d) ETHERNET
42. Which
is the command line prompt for TCP file transfer ?
a) #
b) C:>
c) FTP>
d) $
43. Which
of the following is not a semiconductor ?
a) Diamond
b) Germanium
c) Silicon
d) Gallium
arsenide
44. In a
full wave rectifier, the current flows in each of the diodes for
a) One-fourth
cycle of the input signal
b) The
complete cycle of the input signal
c) Less
than half the cycle of the input signal
d) Half-cycle
of the input signal
45. The
negative feedback in an amplifier
a) Decrease
the bandwidth
b) Increases
voltage gain
c) Does
not affect the voltage gain
d) Reduces
voltage gain
46. An
astable mutivibrator is basically s
a) Two
stage RC coupled amplifier
b) Two
stage tuned amplifier
c) RF
amplifier with positive feedback
d) RF
amplifier with negative feedback
47. The
emitter of a transistor is very ______ and _______ doped.
a) Thick,
heavely
b) Thin,
lightly
c) Thin,heavily
d) Thick,
lightly
48. In
amplifier application FET operates in the
a) Zener
breakdown region
b) Controlled
resistor regon
c) Controlled
source region
d) Avalanche
breakdown region
49. Which
property of a database transaction says the effect of concurrent execution of
statement must be equivalent to serial execution ?
a) Durability
b) Atomicity
c) Consistency
d) isolation
50. A
disk crash is reported under
a) Media
failure
b) User
error
c) Statement
failure
d) Instance
failure
51. Which
of the following is used for serial access storage only
a) CD
b) RAM
c) Magnetic
tape
d) Magnetic
disk
52. CPU’s
processing power is measure in
a) Nano
seconds
b) IPS
c) CIPS
d) NIPS
53. A
24-bit operand permits as many as ______ addresses
a) 16000
b) 160000
c) 1600
d) None
of the above
54. The
section of code that accesses shared variables is called
a) Procedure
b) Critical
section
c) Block
d) Semaphore
55. Prepaging
is the process of bringing the page to the memory
a) Where
locality of reference is not known
b) At
the time the page is referenced
c) Before
the page is referenced
d) When
page fault occurs
56. Inodes,
pid and uid are the ---- names of an entity.
a) Entity
b) Symbolic
c) Logical
d) Physical
57. Identify
the strategy which ahs the lowest storage cost and high locality of reference
a) Selective
replication
b) Centralized
c) Partitioned
d) Complete
replication
58. Under
which data allocation metrics is under –utilization of resources analyzed ?
a) Communication
cost
b) Locality
of reference
c) Performance
d) Storage
cost
59. The
operands for a statement can be a
a) Keyword
b) Comment
c) Constant
d) Mnemonic
60. Which
kind of instruction is used by the compilers and assemblers to align coder ?
a) There
operand instruction
b) No
operand instruction
c) One
operand instruction
d) Two
operand instruction
61. Which
buffering methodology suffers form ‘Head of line’ problem ?
a) Input-output
buffering
b) Input
buffering
c) Output
buffering
d) Central
buffering
62. How
is a variable accessed form another file?
a) The
global variable is referenced via the extern specifier
b) The
global variable is referenced via the auto specifier
c) The
global variable is referenced via the pointer specifier
d) The
global variable is reference via the ext specifier
