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UGC Net JUN 2013 : ELECTRONIC SCIENCE PAPER II

7 pages, 48 questions, 47 questions with responses, 51 total responses,

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PAPER-II ELECTRONIC SCIENCE Signature and Name of Invigilator 1. (Signature) __________________________ OMR Sheet No. : ............................................... (To be filled by the Candidate) (Name) ____________________________ Roll No. 2. (Signature) __________________________ (In figures as per admission card) (Name) ____________________________ 88 S Roll No.________________________________ (In words) 1 3 1 Time : 1 /4 hours] [Maximum Marks : 100 Number of Pages in this Booklet : 8 Instructions for the Candidates Number of Questions in this Booklet : 50 1. 2. - 3. , - - , : (i) - / - / (ii) - / - - (iii) OMR - 4. (A), (B), (C) (D) : (C) 5. I OMR OMR , 6. 7. (Rough Work) 8. OMR , , , , , 9. OMR OMR 10. / 11. ( ) 12. 1. Write your roll number in the space provided on the top of this page. 2. This paper consists of fifty multiple-choice type of questions. 3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below : (i) To have access to the Question Booklet, tear off the paper seal / polythene bag on the booklet. Do not accept a booklet without sticker-seal / without polythene bag and do not accept an open booklet. (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the Question Booklet will be replaced nor any extra time will be given. (iii) After this verification is over, the OMR Sheet Number should be entered on this Test Booklet. 4. Each item has four alternative responses marked (A), (B), (C) and (D). You have to darken the circle as indicated below on the correct response against each item. Example : where (C) is the correct response. 5. Your responses to the items are to be indicated in the OMR Sheet given inside the Paper I Booklet only. If you mark at any place other than in the circle in the OMR Sheet, it will not be evaluated. 6. Read instructions given inside carefully. 7. Rough Work is to be done in the end of this booklet. 8. If you write your Name, Roll Number, Phone Number or put any mark on any part of the OMR Sheet, except for the space allotted for the relevant entries, which may disclose your identity, or use abusive language or employ any other unfair means, you will render yourself liable to disqualification. 9. You have to return the original OMR Sheet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. You are however, allowed to carry duplicate copy of OMR Sheet on conclusion of examination. 10. Use only Blue/Black Ball point pen. 11. Use of any calculator or log table etc., is prohibited. 12. There is no negative marks for incorrect answers. S-88-13 1 P.T.O. ELECTRONIC SCIENCE Paper II Note : This paper contains fifty (50) objective type questions of two (2) questions are compulsory. 7. An 8086 has how 1. The p-n junction diode is a flags ? (A) Passive device (A) 5 (B) Vacuum device (C) 9 (C) Unilateral device (D) Bilateral device 2. In 8085, microprocessor, the register which holds the address of the next instruction to be executed is (A) Instruction register (B) Stack pointer (C) Temporary register (D) Program counter The Pentium III processor is a (A) 16 bit processor (B) 32 bit processor (C) 64 bit processor (D) 128 bit processor 10. Demodulation is a process (A) done at the transmitter (B) of filtering the carrier (C) of removing the sidebands (D) similar to modulation 11. The terms frequency pushing and pulling are related to (A) Reflex Klystron (B) Two cavity klystron (C) Pulsed radar system (D) Magnetron 12. The superposition theorem is essentially based on the concept of (A) Quality (B) Linearity (C) Reciprocity (D) Non-linearity 5. A counter that counts in binary from 0000 to 1010 is known as (A) Binary counter (B) Decade counter (C) BCD counter (D) Mod-10 counter 6. A digital multiplexer is a/an (A) Combinational circuit (B) Sequential circuit (C) Amplifier (D) Memory device Paper-II (B) 7 (D) 11 9. A JFET has (A) One built-in diode (B) Two built-in diode (C) Three built-in diode (D) Four built-in diode 4. many number of 8. Out of the following memory types, one that is volatile is (A) Magnetic disc (B) Ferrite core (C) Semiconductor ROM (D) Semiconductor RAM A semiconductor has ______ temperature co-efficient of resistance (A) Zero (B) Positive (C) Negative (D) One 3. marks each. All 2 S-88-13 13. When Q of an antenna increases, the bandwidth (A) increases (B) decreases (C) stays constant equal to zero (D) stays constant equal to unity 14. The value of intrinsic-stand-off ratio of UJT should be (A) >1 (B) <1 (C) 0 (zero) (D) 10 15. In a normal ECG waveform which wave has the maximum amplitude ? (A) P wave (B) R wave (C) Q wave (D) T wave 16. The following items consist of two statements, one labelled as Assertion A and the other labelled the Reason (R) . You are to examine these two statements and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly. Codes : (A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true and (R) is false. (D) (A) is false and (R) is true. What will be the output of the following statements ? int a = 5, b = 2, c = 10, i = a > b Void main ( ) {print f( hello ); main ( );} (A) 1 (B) 2 (C) infinite number of times (D) 10 18. Which data communication method is used for sending data in both directions at the same time ? (A) Super duplex (B) Simplex (C) Half duplex (D) Full duplex 19. 21. 3 Assertion (A) : In a common base amplifier voltage gain is more than 1. Reason (R) : In a common base amplifier current gain is less than 1. 22. The highest data rate in fiber optic communication occurs in (A) Single-mode fiber (B) Graded-index fiber (C) Multimode fiber (D) Co-axial cable S-88-13 Routh s array for a system is given below : 1 3 5 S4 1 2 9 S3 1 5 S2 3 S1 5 S0 The system is (A) Stable (B) Unstable (C) Marginally stable (D) Conditionally stable Assertion-Reason type questions : The output impedance in an ideal Op-Amp is (A) Zero (B) 20 (C) 60 (D) infinity 17. 20. Assertion (A) : Op-Amp is used for amplification of weak signals. Reason (R) : To rectify EMG signals, precision rectifiers are used. Paper-II 23. Assertion (A) : Gray is unweighted code. Reason (R) : Gray code is not self complementary. 24. Assertion (A) : TDM and FDM accomplish the same end by different means. Reason (R) : FDM involves simpler instrumentation as compared to TDM. Assertion (A) : A number of thyristors operating in parallel can not share a common heat sink. Reason (R) : For simultaneous firing of the thyristor opto isolators may be employed in the gate driving circuit. 30. Assertion (A) : ABCD parameters are transmission parameters. Reason (R) : The relationship between input and output is given by : V1 A B V2 = I1 C D I2 31. 25. 29. Consider the following devices : 1. RTL 2. High Speed TTL 3. ECL 4. CMOS The correct sequence of their decrease in power dissipation is (A) 3, 1, 2, 4 (B) 3, 1, 4 ,2 (C) 1, 3, 2, 4 (D) 3, 2, 4, 1 32. Arrange the following in terms of their increasing conductivity : 1. Copper 2. Steel 3. Leather 4. Rubber The correct sequence is (A) 4, 3, 2, 1 (B) 4, 3, 1, 2 (C) 3, 4, 2, 1 (D) 2, 1, 3, 4 Assertion (A) : A SSB system is used for broadcasting applications. Reason (R) : The saving of power in SSB system is 75%. 26. Assertion (A) : Dual slope A/D converter is the most preferred conversion technique employed in most of the digital multimeters. Reason (R) : Dual slope A/D converter provides high accuracy while at the same time suppresses the HUM effect on the input signal. 27. Assertion (A) :The system of propagation in waveguides is in accordance to field theory. Reason (R) : The system of propagation in transmission line is in accordance with circuit theory. 28. Assertion (A) : For a function to be odd f( x) = f(x). Reason (R) : If a function is odd, its Fourier series only contains cosine terms. Paper-II 4 S-88-13 33. Following are the EM waves : 1. Red colour light 2. Blue colour light 3. Microwaves 4. X-rays The correct sequence of decreasing order of wavelength is (A) 2, 4, 3, 1 (B) 1, 3, 2, 4 (C) 3, 1, 4, 2 (D) 3, 1, 2, 4 34. Following are the process steps to fabricate an IC : 1. Crystal growth 2. Epitaxial growth 3. Photo etching 4. Diffusion 5. Vacuum evaporation of Aluminium The correct sequence of fabrication is (A) 1, 5, 3, 4, 2 (B) 1, 2, 3, 4, 5 (C) 1, 3, 2, 4, 5 (D) 1, 2, 4, 3, 5 35. Following are the modulation/ multiplexing techniques : 1. AM 2. FM 3. CDMA 4. WDM The correct sequence of carrier frequency in decreasing order is (A) 1, 2, 3, 4 (B) 4, 3, 1, 2 (C) 4, 3, 2, 1 (D) 3, 4, 2, 1 S-88-13 36. Match the following : List I List II a. LED i. Heavily doped b. APD ii. Coherent radiation c. Tunnel iii. Spontaneous diode emission d. Laser iv. Current gain The correct sequence is given by a b c d (A) ii i iii iv (B) iv iii ii i (C) iii iv i ii (D) iii ii i iv 37. Match the following : List I List II a. Cassegrain i. Large B.W. antenna b. Yagi antenna ii. Direction finding c. Parabolic iii. Radar reflector antenna d. Loop antenna iv. Directional transmission a b c d (A) i iv ii iii (B) iii i iv ii (C) ii iv iii i (D) iii ii iv i 38. 5 Match the lists : List I List II (Band gap in eV) (Materials) a. 0.67 i. Ga As b. 1.1 ii. Cadmium sulphate c. 1.4 iii. Si d. 2.4 iv. Ge The correct matching order is a b c d (A) iv iii i ii (B) iii ii i iv (C) iv i iii ii (D) ii iii i iv Paper-II 39. 40. Match the following : List I List II a. Voltage i. increases series input feedback impedance connection b. Voltage ii. decreases the shunt input feedback impedance connection c. Current series iii. increases the feedback output connection impedance d. Voltage iv. decreases the series output feedback impedance connection The correct matching order is a b c d (A) iv ii iii i (B) iv ii i iii (C) i iii iv ii (D) i ii iii iv 41. List II Zener diode Filter capacitor No output voltage Power transformer d iii ii iii iv 42. 6 Match the following lists : List I List II a. Maxwells i. Measurement of bridge unknown inductance b. Hay s bridge ii. Measurement of high Q of coils c. Schering s iii. Precision bridge measurement of capacitance d. Weins bridge iv. To measure frequency a b c d (A) i ii iii iv (B) iv iii ii i (C) iv ii iii i (D) i iii ii iv 43. Match the following lists : List I List II a. Electroi. Tracing brain myogram waves b. Electroii. Tracing of cardiogram muscular waves c. Electroiii. Measurement encephalogram of air in lungs d. Spirometer iv. A record of electrical activity of heart a b c d (A) i ii iii iv (B) i iv iii ii (C) i iv ii iii (D) iv iii i ii Paper-II Match the following : List I a. Removes ac i. ripple b. Supplies ac ii. input voltage c. Constant dc iii. output voltage d. Filter choke iv. inductor a b c (A) ii iv i (B) i iv iii (C) iv i ii (D) ii iii i Match the following lists : List I List II a. Gamma rays i. 400-700 nm b. Visible light ii. 1-10 cm c. Radiowaves iii. 3 10+3 m d. Microwaves iv. 4 10 11 m a b c d (A) i ii iii iv (B) iv iii ii i (C) iv i iii ii (D) ii iii iv i S-88-13 44. 45. Match the List I and List II : List I List II (Type of (No. of flip flops counters) required) a. Mod-6 i. 3 b. Mod-11 ii. 4 c. Mod-31 iii. 5 a b c (A) iii ii i (B) i ii iii (C) ii iii i (D) iii i ii 46. 47. Which of the following elements is a semiconductor ? (A) Germanium (B) Copper (C) Carbon (D) Phosphorous 48. When a reverse bias is applied to a junction diode (A) potential barrier is lowered (B) majority carrier current is increased (C) minority carrier current is increased (D) potential barrier is raised 49. Photo-diode is reverse biased because (A) only one side is illuminated (B) majority swept are reverse biased across the function (C) reverse current is small as compared to photo current (D) reverse current is large as compared to photocurrent 50. Match the following lists : List I List II (Units) (Quantity) a. ps/nm/km i. Attenuation b. dB/km ii. Magnetic field c. cm2/v-s iii. Dispersion d. Tesla iv. Mobility a b c d (A) iv i ii iii (B) iii i ii iv (C) iii i iv ii (D) i iv iii ii Semiconductors are sensitive to (A) heat (B) magnetic field (C) light energy (D) all of the above Avalanche photodiodes are preferred over PIN diodes in optical communication systems because of (A) Speed of operation (B) Higher sensitivity (C) Larger bandwidth (D) Larger power handling capacity Read the paragraph and answer the questions 46 to 50 : p-i-n photodiode contains a layer of intrinsic semi-conductor material sandwiched between p-and-n regions. The depletion layer is wholly contained within the i region. Thickness of the intrinsic region can be adjusted to produce device with optimum sensitivity and frequency response. P-i-n photodiode is most common type of depletion layer photodiode. The other class of photodiodes, avalanche photodiodes, are reverse-biased p-n junction diodes that are operated at voltages above the breakdown voltage. Current multiplication of electron-hole pairs generated by the incident electromagnetic radiation, occurs due to avalanche process. The photomultiplication factor Mpn is defined as ratio of the multiplied photocurrent Ipm to the photocurrent Ipho at voltage below breakdown where no avalanche multiplication takes place. S-88-13 7 Paper-II Space For Rough Work Paper-II 8 S-88-13

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