 #  Ugc Net Electronic Science Mock Test-Mcq With Question Answer Pdf

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### Ugc Net Electronic Science Mock Test I Mock Test For Electronic Science

5. For queue to be idle state in 8086
(1) QS
0 = 0, QS1 = 0 (2) QS0 = 1, QS1 = 0
(3) QS
0 = 0, QS1 = 1 (4) QS0 = 1, QS1 = 1

6. Which of the following is incorrect reference to the array in FORTRAN :
(1) A (2, 5) (2) A (2 * 3, 6)
(3) A (N, X) (4) A (LOCATION, 8)

8. Which of the following is associated with single balanced modulator circuit :
(1) Single side band transmission
(2) double side band transmission
(3) Vestigial side band transmission
(4) Double side band with full carrier transmission

48. If Es is the field intensity vector identified as a phasor by its subscript ‘S’ and ko is the
wave number, equation
2 E
S = –k2 ES is known as :
(1) Vector Helmholtz equation (2) Poisson’s equation
(3) Coulombs gauge equation (4) Diffusion equation

50. Which of the following antenna is not a wideband antenna ?
(1) Discone (2) Helical
(3) Folded dipole (4) Marconi

### Ugc Net Electronic Science Mock Test

1. A conducting line on an IC chip is 2.8 mm long and has a rectangular cross-section of
1
μm × 4 μm. A current of 5 mA produces a voltage drop of 100 mV across the line. If the
electron mobility is 500 cm
2/V-s, the electron concentration is
(1) 4.38
× 1021 cm–3 (2) 3.5 × 1017 cm–3
(3) 5.48 × 1021 cm–3 (4) 4.6 × 1020 cm–3

7. In a 4 bit ripple counter and a 4 bit synchronous counter are made using flip-flops having
a propagation delay of 10 ns each. If the worst case delay in the ripple counter and the
synchronous counter be ‘R’ & ‘S’ respectively, then the value of ‘R’ & ‘S’ is given by :
(1) R = 10 ns, S = 40 ns (2) R = 40 ns, S = 10 ns
(3) R = 10 ns, S = 30 ns (4) R = 30 ns, S = 10 ns

8. The Boolean expression AC + BC is equivalent to : –
(1) AC + B – C + AC (2) – BC + AC+ B – C + – AC – B–
(3) AC + BC + – BC + ABC (4) ABC + – AB – C + AB – C + A – BC –

9. For pushing of flags and popping of flags in 8086, the instructions are :
(1) Push and Pop (2) Push F and Pop F
(3) Push and Pop F (4) None of the above

### Ugc Net Electronic Science Question Papers With Answers

11. Which of the following cannot be a member of a structure in ‘C’ ?
(1) Enumeration (2) Another structure
(3) Function (4) Array

12.
For which of the following declarations in ‘C’, “NEXT ++;” code will fail ?
(1) # define NEXT 85.5 (2) char *NEXT = “A”;
(3) float NEXT = 85.5 (4) None of the above

13. In a loss less transmission line of length 50 cm with L = 10 μH/m, C = 40 pF/m is
operated at 25 MHz. Its electrical path length is
(1) 0.5 metres (2)
λ metres
(3)

14. A TRAPATT diode has the doping concentration NA = 2 × 1015/cm3 and a current density
of 20 kA/cm
2. The value of avalanche zone velocity is given by :
(1) 6.25
× 109 cm/s (2) 6.25 × 107 cm/s
(3) 6.25
× 108 m/s (4) 6.25 × 103 cm/s

18. A channel with bit rate R
b = 36 Kbps is available for PCM voice transmission. Find the
sampling rate f
s, assuming fm = 3.2 kHz.
(1) 7.2 MHz (2) 3.6 MHz
(3) 3.6 kHz (4) 7.2 kHz

19. The fundamental law that is used in temperature measurement is known as
(1) First law of thermodynamics (2) Second law of thermodynamics
(3) Third law of thermodynamics (4) Zeroth law of thermodynamics

### Electronic Science Ugc Net Mock Test

25. Read the following statements regarding complexity of a network :
(a) The order of complexity of a network is defined as the number of independent initial
conditions that can be specified in a network.
(b) The number of state equations that can be written for a network is equal to the order
of the complexity of the network.
(c) The order of complexity is always more than the number of energy storing elements.
(d) The number of state equations that can be written for a network is always higher
than the number of energy storing elements.
Which of the above statements are correct ?
(1) (a) and (b) are correct. (2) (b) and (c) are correct.
(3) (c) and (d) are correct. (4) (a) and (c) are correct.

27. For a three state TTL following statements are given :
(a) It allows to connect outputs directly.
(b) It allows to connect the inputs directly.
(c) It is used to decrease the switching time.
(d) It is used to increase the switching time in order to interface the peripherals for
matching the speed with computer.
Which of the above are correct ?
(1) (a) & (d) (2) (a) and (c)
(3) (b) & (c) (4) (b) & (d)

28. For A to D converters, following statements are given :
(a) It is the process of converting time varying input to discrete output levels.
(b) Flash type A/D conversion are slow in nature.
(c) The quantisation error depends upon the step size of quantisation.
(d) Flash type A/D conversion is a simultaneous conversion.
Which of the above are correct ?
(1) (a), (b) & (c) (2) (a), (c) & (d)
(3) (a) and (b) only (4) (b), (d) & (c) only

29. Consider the following registers :

 (a) A and B registers (c) D and E registers (b) B and C registers (d) H and L registers

Which of these 8-bit registers of 8085 microprocessor can be paired together to make a
16 bit register ?
(1) (a), (c) and (d) (2) (a), (b) and (c)
(3) (b), (c) and (d) (4) (b), (d) and (a)

### Ugc Net Mock Test Paper 2 Electronic Science

32. Which of the following statements are correct about the C declarations given below ?
char *p = “Honesty”;
char a[ ] = “Honesty”;
(a) There is no difference in the declarations and both serve the same purpose.
(b) In both cases the ‘\o’ will be added at the end of the string “Honesty”.
(c) The first statement is incorrect since ‘\o’ is not given in the string.
(d) ‘p’ is a non-const pointer pointing to a non-const string, whereas ‘a’ is a const
pointer pointing to a non-const string.
Codes :
(1) (a) and (b) are correct. (2) (c) and (d) are correct.
(3) (a) and (c) are correct. (4) (b) and (d) are correct

34. Helical antenna is used for satellite tracking because of
(a) the circular polarisation
(b) the good front to back ratio
(c) the Tropo scatter
Which of the above are correct ?
(1) (a) and (b) (2) (b) and (c)
(3) (a) and (d) (4) (c) and (d)

35. Which of the following statements are correct ?
(a) Large carrier AM signal are detected by using square law detectors.
(b) Low level modulated signal (~ below IV) are detected by square law detectors.
(c) Ratio detector is sensitive to amplitude variations therefore must be preceded by
amplitude limiter circuit.
(d) A Foster-Seeley discriminator circuit converts the frequency deviation of the FM
wave into original intelligence signal.
Options :
(1) (a) & (c) are correct. (2) (b) & (d) are correct.
(3) (a), (c) & (d) are correct. (4) (b), (c) & (d) are correct.

36.
Which of the following statements are correct ?
(a) In CDMA, the entire bandwidth can be used all the time.
(b) TDMA is a technique which does not allow for spectrum re-un i.e. utilizing same
spectrum in different time slots.
(d) FDMA is the simplest & most basic format Multiple Access Communications.
Options :
(1) (b) & (c) are correct. (2) (a), (c) & (d) are correct.
(3) (a) & (d) are correct. (4) (c) & (d) are correct.

37. Which of the following statements are correct in case of Light Emitting Diodes ?
(a) Homojunctions LEDs are often surface emitters.
(b) Heterojunctions LEDs are Edge emitters.
(c) Heterojunction LEDs are often surface emitters.
(d) LEDs provide monochromatic & coherent radiations.
Options :
(1) (a) & (b) are correct. (2) (a) & (c) are correct.
(3) (a), (b) & (d) are correct. (4) (a), (c) & (d) are correct.

### Ugc Net Electronic Science Online Mock Test I Ugc Net Electronic Science Mock Test

38. Which of the following statements are incorrect in case of semiconductor LASERs ?
(a) Stimulated emission rate dominates the spontaneous emission with increase in the
value of energy of radiation per unit volume per unit frequency.
(b) Stimulated emission rate dominates the absorption rate of the charge carriers in the
ground state are higher than the excited state.
(c) LASERs have a longer life-line than LEDs.
(d) LASER diodes are more temperature sensitive than LEDs.
Options :
(1) (c) & (d) are incorrect. (2) (a), (c) and (d) are incorrect.
(3) (a) & (d) are incorrect. (4) (b) & (c) are incorrect.

39.
Read the following statements regarding biomedical instrumentations :
(a) Sphygmos is used for blood pressure measurement.
(b) EMG represents a record of the electrical activity of the brain.
(c) ERG represents the record of potential from the retina.
(d) ECG represents the record of electrical activity of brain.
Which of the above statements are correct ?
(1) (a) and (b) are correct. (2) (b) and (c) are correct.
(3) (a) and (c) are correct. (4) (b) and (d) are correct.

40. Read the following statements regarding PID controller :
(a) The system complexity of a PID controller is less than that of a PI controller.
(b) A PID controller produces no action for any constant error signal.
(c) A PID controller is used to increase the damping factor of the dominant poles of a PI
controlled system.
(d) A PID controller is used to decrease the damping factor of the dominant poles of a
PI controlled system.
Which of the above statements are correct ?
(1) (a) and (b) (2) (b) and (c)
(3) (a) and (d) (4) (b) and (d)

53. Arrange the following fabrication steps in order needed to fabricate the IC :

 (a) Oxidation (c) Metallization Codes : (b) Etching (d) Epitaxial growth

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

(2) (d) (a) (b) (c)
(3) (b) (c) (d) (a)
(4) (c) (d) (a) (b)

### Electronic Science Mock Test Paper 2 I Ugc Net Electronic Science Mock Test

71. The pH value of a solution having a hydrogen ion concentration of 2.3 × 10–11 g/litre is :
(1) Strong acidic in nature (2) Alkaline in nature
(3) Neutral (4) Slightly acidic

72. The reference electrode in pH measurement is
(1) Glass electrode (2) Hydrogen electrode
(3) Antimony electrode (4) Hg-Calomel electrode

73. ECG represents :
(1) the rhythmic curve of depolarisation and repolarisation of the myocardium, the heart
muscle.
(2) the wave form of the voltage produced in the heart muscle due to an externally
applied electrical stimulus.
(3) the record of electrical currents flowing in the cardiac muscle.
(4) the record of intensity of heart sounds at different intervals sensed by an electroacoustic sensor.

74. Optical pyrometers are used to measure :
(1) High intensity (2) Low temperatures
(3) High temperatures (4) Light intensity & high temperatures

75. Which of the following is a positive displacement device ?
(1) Rotameter (2) Sliding vane flow meter
(3) Turbine flow meter (4) Volumetric tank

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