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    i ii iii i i

    ROLL No.

    Time: 2 Hours

    L L}TEST BOOKLET No. b

    TEST FOR POST GRADUATE PROGRAMMESINSTRUMENTATION

    Maxiinurn Marks: 450

    INSTRUCTION S TO CANDIDATES

    You are provided with a Test Book et and an Optica Mark Reader (OMR) Answer Sheet to markyour responses. Do not soi the Answer Sheet. Read carefu y a the instmctions given on theAnswer Sheet.Write your Ro Number in the space provided on the top of this pageA so write your Ro Number. Test Code, and Test Subject in the co umns provided for the sameon the Answer Sheet. Darken the appropriate bubb es with a Ba Point Pen.The paper consists of 150 objective type questions. A questions carry equa marks.Each question has four a ternative responses marked A, B, C and D and you have to darken thebubb e fu y by a Ba Point Pen corresponding to the correct response as indicated in the examp eshown on the Answer Sheet.Each correct answer carries 3 marks and each wrong answer carries 1 minus mar-

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    1INSTRUMENTATION

    The change in the va ue of an ana og signa during the conversionprocess produces(A) reso ution error(C) quantisationerrcr (B) Niquist error(D) samp ing error

    Ho ding current for an SCR is best defined as

    (A) the minimum current required for turn off(B) the current required to maintain conduction(C) the current required for an SCR to tum on(D) the gate current required to maintain conductionA measure of the repeatabi ity of irteasurenient of a quantity is(A) error (B) precision(C) accuracy (D) sensitivityThe digits of a measured number that are known to be correct arecafled

    (A) accuracy digits (B) precision digits(C) significant digits (D) correct digitsThe condition for a resistor to have same va ue of resistance at mediumfrequencies is as with DC is(A) CR2=I, (B) CR2--2L(C) cR=wL (D) CR2=2WLWhich two va ues are p otted in a B-H curve?

    (A) Re uctance and F ux density(B) Ma gnetising force and Permeabi ity(C) Pennca z-i ity and Re uctance(D) F ux density and Magnetising force

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    0.

    2 I i iFor turbu ent How, the ve ocity at the centre is times the meanve ocity.(A) 1.2 (B) 2.2(C) 2.0 (D) 1.5MEMS is an acronym for

    (A) Micro E ectro Magnetic Systems(B) Micro E ectro Mechanica Systems(C) Micro E ectro Materia Systems(D) Micro Engineering of Mechanica systems

    The bandwidth of e ectrocardiogram (ECG) amp ifier is(A) DC to 0.01 Hz (B) 550 to 1500 Hz(C) 0.05 to 500 Hz (D) 2000 to 10000 Hz

    The output of an LVDT is

    (A) vo tage (B) current(C) inductance (D) capacitanceThe gain of the passive attenuator shown be ow is

    Input.

    (B) 0.1(C) 1 (D) 9

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    12.

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    3 iIn a temperature contro system, what represents the output of thesystem?

    (A) Actua temperature achieved(B) The required temperature(C) Heating e ement(D) Heat produced in the systemThe Lap ace transform ote*2' sin Ztnt is

    (A) 25 / (3- -2)2 + 2:022 (B) 2m/(s+2)*+4of(C) 2m/(s~2) +4032 (D) 23 / (s2)2 + 2m

    In a n-p-n transistor circuit, the co ector current is 01nA. If 90% ofthe e ectrons emitted reach the co ector, then(A) emitter current wi be 9 mA(B) emitter current wi be 1_nAr(C) base current wi he n1A(D) base current wi be - rnA

    In a fu wave rectifier circuit operating from 50Hz mains frequency,the fundamenta frequency in the ripp e wou d be(A) 25Hz (B) 50Hz(C) 70.7Hz (D) 1001-12A trucks speed increases uniform y from 15 km/ u: to 60 km/hr in 20 s.The average speed wi be

    (A) 10.4111/s (B) 104m/s(C) 10.4

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    18. Two e ectric bu bs, each designed to operate with a power of 500 wattsin a 220 V ine, are put in series in 110V ine. What wi be the powergenerated by each bu b?(A) 31.25 watts(C) 125 watts (B) 62.50 watts(D) 250 watts

    19. We desire to measure the current through and vo tage across a resistorconnected in a circuit. How shou d the annneter and the vo tmeter beconnected?(A) Both are connected para e with the resistor(B) Both are connected in series with the resistor(C) Annneter is connected in series and vo tmeter is connectedpara e with the resistor(D) Annncter is connected in para e and vo tmeter is connectedin series with the resistor

    20 RC time constant in a RC circuit is(A) the time, in seconds taken for the current to drop to 0.368 ofits origina va ue(B) the time, in seconds taken for the current to drop to 0.632 ofits origina va ue(C) the time, in seconds taken for the current to drop to 0.500 ofits origina va ue(D) the time, in seconds taken for the current to drop to 0.750 ofits origina va ue

    21. One Tes a of magnetic fie d is equa to(A) 10 Gauss (B) 10 Gauss(C) 102 Gauss (D) 10 Gauss

    22. The binary number 110000111101 corresponds to the hexa decimanumber(A) CFD (B) D3C(C) DBF (D) C3D

    fl flt 111

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    E61713

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    5 fl |||Which of the fo owing is most usefu to measure temperature of theorder of 3500K?

    (A) Optica pyromctei (B) Carbon resistor(C) Gas bu b thermometer (D) Thermocoup eGray is a unit of

    (A) radiation dose (B) photon energy(C) phonon energy (D) magnetic fie dThe unit of uminous intensity is(A) umen (B) ux(C) cande a (D) wattA b ock of meta which weighs 60 newtons in air and 40 newtonsunder water has 0 density, in ki ograms per meter cubed, of

    (A) 1000(C) 5000 (B) 3000(D) 7000In physics, :1 radian per second is a unit of:

    (A) angu ar disp acement (B) angu ar acce eration(C) angu ar ve ocity (D) angu ar momentumWhich of the fo owing co ors of visib e ight has the ongestwave ength?(A) vio et (B) green(C) ye ow (D) redThe S1 unit of pressure is(A) Torr (B) Pasca(C) Newton (D) Atmosphere

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    61713

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    A 10 vo t batteiy connected to a capacitor de ivers a charge of 0.5cou oinbs. The capacitance of the capacitor is(B) 5x10? fatads(D) S farads(A) 2>< O2 farads(C) Zfarads

    T he ha f- ife of an isotope of an e ement is 5 days. The mass of a 10gram samp e of this isotope remaining after 20 days is(A) 0.312 grams(C) 1.25 grams (B) 0.625 grams(D) 2.50 grams

    The first instrument used for ineasuring te1npe1'at'ure was the gasthennoscope invented by(A) Ce sius(C) Centigrade (B) Ga i eo(D) Fahrenheit

    Which of the fo owing best comp etes the statement? The ca orie isthe amount of heat needed to raise(A) 1 gram of water 1 degree Ce sius(B) 1 gram of water 1 degree Rankin(C) 1 ki ogram of water 1 degree Ce sius(D) 1 ki ogram of water 1 degree Ke vin

    Which one of the fo owing is the name of a device used to measurevo tage without drawing ANY current from the circuit beingmeasured?(A) Awattineter(C) A ga vanometer (B) An ammeter(D) Apotentioineter

    When a person stands on a sca e in an e evator at rest, the sca e reads800 Newtons. When the e evator is a owed to fa free y withacce eration of gravity, the sca e reads(A) 1600 Newtons(C) 400 Newtons (B) 800 Newtons(D) 0Newtons

    | ||||

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    i61713_

    36.

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    7 I i i flThe shape of a magnetic fie d around a ong straight current canyingwire is

    (A) e iptica(B) circu ar(C) varies depending on the magnitude of the current(D) squareWhat represents the ratio of speed of an object to the speed of soundthe surrounding air?

    (A) Mach number(C) Reyno ds number (B) Poissons ratio(D) Nautica mi eThe e ectric fie d of a point charge varies

    (A) inear y with distance and inverse y with charge(B) inear y with distance and inverse y with charge squared(C) inear y with charge and inverse y with distance squared(D) inear y with charge and inverse y with distanceRatio of abso ute viscosity to the density of the fluid is ca ed(A) re ative viscosity (B) viscosity index(C) kinematic viscosity (D) f uidityTachometer is an instrument used for

    (A) measuring rpm of a motor(B) tracking magnetic objects(C) tack e the spikes in an e ectrica circuit(D) measuring the f ow of iquidsIn a fu wave rectifier without a fi ter, the ripp e factor is(A) 0.482 (B) 1.21(C) 2.05 (D) 1.79

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    42.

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    8 I IIn an intrinsic semiconductor, the Fenni~ eve is

    (A)(B)(C)(D)

    c oser to the va ence bandc oser to the conduction bandmidway between conduction and va ence bandwithin the va ence band

    A differentia amp ifier, amp ifies(A)(B)(C)(D)

    and mathematica y differentiates the average of the vo tageson the two input inesand differentiates the input waveform on one ine when theother ine is groundedthe difference of vo tages between the two input inesand differentiates the sum of the two input waveformsIt is required to construct a counter to count upto 100 (decima ). Theminimum number of f ip-f ops required to construct the counter is

    (A)(C) 8 (B) 7(D) 5Transistor is a(A) current contro ed cuircnt device(3)(C) current contro ed vo tage devicevo tage contro ed cunent device(D) vo tage contro ed vo tage device

    The function of a b eeder resistor in a power supp y is(A)(B)(C)(D)

    the same as that of oad resistorto ensure a minimum current drain in the circuitto increase the output dc vo tageto increase the output cunent

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    9 H||||| fln~type si icon is obtained by

    (A) doping with tetrava ent e ement(B) doping with pentava ent e ement(C) doping with triva ent e ement(D) doping with a mixture of triva ent and tetrava ent e ementThe current amp ification factor in CB configuration is

    (A) G(C) 1/13 (B) 3+1(D) 5Two stages of BJT amp ifiers are cascaded by RC coup ing. Thevo tage gain of the first stage is 10 and that of the second stage is 20.The overa gain of the coup ed amp ifier is(A) 10x20 (B) 10+-20(C) (1o+2o) (D) ( 0x20)/2When the temperature of a doped semiconductor is increased, itsresistivity

    (A) decreases(B) increases(C) does not change(D) increases or decreases depending on whether it is is type or ntypeRegu ation of a dc power supp y is given by

    (A) product of no oad output vo tage and fu - oad cunent(B) ratio of fu - oad output vo tage and fu - oad current(C) change in output vo tage from no- oad to fu - oad(D) change in output impedance from no- oad to fu - oad

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    52.

    53.

    S4.

    57.

    10 fl ||||A Zener diode

    (A) has a high forward vo tage rating(B) has a sharp breakdown at ow reverse vo tage(C) is usefu as an amp ifier(D) has a negative resistanceNegative feedback in an amp ifier

    (A) reduces the vo tage gain(B) increases the vo tage gain(C) does not affect the vo tage gain(D) converts the amp ifier into an osci ator

    Fie d effect transistor has(A) arge input impedance(B) arge power gain(C) arge output impedance(D) arge vo tage gain

    A sing e transistor can be used to bui d which of the fo owing?(A) AND gate(C) NOT gate (B) NOR gate(D) NAND gate

    The basic ogic gate whose output is the comp ement of its input(A) OR gate(C) AND gate (B) Inverter gate(D) Comparator

    What input va ues can cause an AND ogic gate produce a HIGHoutput?(A) At east one input is HIGH(B) A inputs are HIGH(C) At east one input is LOW(D) A inputs are LOW

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    (61713,

    59.

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    11A resistor in a circuit dissipates energy at a rate of 1 W. If the vo tageacross the resistor is doub ed, what wi be the new rate of energydissipation?

    (A) 4W(C) 2W (B) 0.5w(D) o.25wIf one arsenic atom is added per 108 gennanium atoms, the number ofe ectrons present for conduction at 300 K wi be

    (A) 1.42:-< 0'3/m (13) 4.4 >

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    12 I64. A fair coin is tossed ti a head appears for the first time. Theprobabi ity that the number of required tosses is odd is(A) 1/3 (B) 1/2(C) 23 (D) 3/465. Two ex_perimenta techniques determine the mass of an object to be1 1 dz 1 kg and 10 -.h 2 kg. These two measurements can be combined togive 2) weighted average. The uncertainty of the weighted average isequa to

    (A) /2 kg (B) 2/J5 kg(C) 2//3 kg (D) 2kg66. If the four enses shown be ow are made of the same materia , whichens has the shortest positive foca ength?(A) (B)

    (C) (D)67. The minimum resistance va ue for 3 b ue, gray, red and si ver resistorIS

    (A) 6120(C) 62100 (B) 6120 :2(D) 6219

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    68.

    69.

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    72.

    73.

    13 I t tThe conductance of an 8 ohm resistance is

    (A) 125 1118 (B) 12.51118(C) 1.258 (D) 12.53In a certain oaded transfonner, the secondary vo tage is one founh ofthe prima y vo tage. The secondary current is

    (A) four times the prirnaty current(B) equa to the primary current(C) one fourth of the primaiy current(D) one eighth of the primaty currentWhen a 12 vo t battery is connected to a primary of a transformer withturns ratio of 12, the secondary vo tage is(A) zero (B) 12 vo ts(C) 144 vo ts (D) tvo tIn an RC integrator, when a 12 V input pu se with a width equa to onetime constant is app ied, the capacitor charges to

    (A) Ovo ts (B) t2.S6v01ts(C) 7.56 vo ts (D) 12 vo tsVan de Graff generators are usefu for

    (A) ow vo tage and high current app ications(B) high vo tage and ow cu rent app ications(C) ow vo tage and ow current app ications(D) high vo tage and high current app icationsThe surface of the Sun has a temperature c ose to 6,000 K and it emitsa b ackbody spectrum that reaches a maximum near 500 nm. For abody with a surface temperature c ose to 300 K, at what wave engthwou d the therma spectnnn reach a maximum?(A) 10 mm (B) 100 um(C) 101nm (D) 100nun

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    61713| 14 fl fl74. The figure be ow shows an object 0 p aced at a distance R to the eft ofa convex spherica mirror that has a radius of curvature R. Point C isthe center of curvature of the mirror. The image formed by the mirroris at 'jL /iff K **i

    (A) a distance R to the right of the mirror and upright(B) a distance R to the eft of the mirror and inverted(C) a distance R13 to the right of the mirror and upright(D) a distance R/3 to the eft of the mirror and inverted75. The circuit shown in the figure be ow consists of eight resistors, eachwith resistance R, and a battery with termina vo tage V and neg igib einterna resistance. What is the current f owing through the battery?

    1

    -L..,M ,.1. ._,, , . .

    _._ II '~7

    (A) V/3R (B) V/2R(C) V/R (D) 3W 2R76. Which of the fo owing asers uti ises transitions that invo ve theenergy eve s of free atoms?

    (A) Diode aser (B) Dye aser(C) Freec ectron aser (D) Gas aser

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    |6 713i77

    78.

    79

    80.

    15Two sinusoida waveforms of the same frequency are disp ayed on anosci oscope screen, as indicated be ow. The horizonta sweep of theosci oscope is set to 100 ns/Cm and the vertica gains of channe s 1and 2 are each set to 2 Won]. The ze1'0vo tage eve of each channe isgiven at the right in the figure. The phase difference between the twowaveforms is most near y

    3 X \ .__//i \\+.T0C t'.g tb P - flu:/A 1)* _ M gj" It---1Icm(A) 120 (B) 45(C) 60 (D) 90A spring of force constant /c is stretched a certain distance. it takestwice as much work to stretch a second spring by ha f this distance.The force constant of the second spring is

    . (A) It(C) 4k (B) 2/c(D) 8kAn e ectron has tota energy equa to four times its rest energy. Themomentum of the e ectron is

    (A) mec (B) ~J2nec(C) \(15mec ID) 4mecPittot tube is an instmment used to measure(A) f ow (B) temperature(C) pressure (D) density

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    61713i81.

    82.

    83.

    84.

    85.

    16 IA simp e RC system shown be ow is an examp e of

    R+ , *3+Vi" C C VcutD

    (B) second order system(D) third order system(A) zero order system(C) first order systemIf the power in a circuit is ca cu ated from the measurements of vo tageand current with maximum error of 4.-1% and ; :2% respective y, thenthe possib e error in the Ca cu ated va ue of power wi be(A) i0.S% (B) .13"/o(C) 172% (D) j:1.S%Which of the fo owing statements is not correct about a vo tagefo ower circuit?

    (A) It has high input impedance(B) It has ow input impedance(C) It is a unity gain amp ifier(D) It has ow output impedanceThe cross section of a Bouden tube is

    (A) e iptica(C) rectangu ar (B) circu ar(D) squareWhich of the fo owing gauges can be used to measure 10-6 Tonpressure?

    (B) U tube manometer(D) Pirani gauge(A) Thermistor gauge(C) Ionisation gauge

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    86.

    87.

    88.

    89.

    90.

    17

    LVDT is a transducer used to measure(A) ow vo tages (B) inear disp acement(C) circu ardisp acement (D) vo tage difference

    | | |||| || fl

    A pipe carrying a fluid vibrates at a frequency of 50Hz withdisp acements of 8 mm from the equi ibrium position. The peakacce eration wi be(B) 400 m/s(D) 200 m/s2(A) 790 m/s(C) 6 m/S2

    A Ha effect transducer can be used to measure(A) current(B) power(C) disp acement(D) current, power and disp acement

    In an e ectromagnetic spectnun, if different regions are arranged in theincreasing order of frequency, which of the fo owing represents thisarrangement?

    (A) Microwaves, inf1'_ared, gamma rays, visib e spectrum(B) Microwaves, infra~red, visib e spectmm, u travio et(C) X-rays, u travio et, visib e, infrared(D) X-rays, visib e, u travio et, microwavesAn integrated circuit chip contains 105 transistors. The transistors havea mean current gain of 20 and a standard deviation of 2. How manytransistors wi have a current gain greater than 17?

    (A) 93.32%(C) 90% (B) 95%(D) 85%

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    161713

    91

    92.

    93.

    94.

    18In the Maxwe bridge shown be ow, if the va ue of R3 is 5 Q and C. is 1nF, what wi be the va ue of the inductance L; (at ba ance, the va ueof R; is 159 Q. and R. i310 Q)?

    (A) 40 mH(C) 50 mH (B) 401-1(D) 50 1-1The binary number 0101 1 0] I001 when expressed in Octa code is(A) 2731 (B) 2371(C) 1732 (D) 7231Which of the fo owing numbers is given to four significant figures?

    (A) 0.00020(C) 2.000 (B) 00020(D) 2000A ba is swung on the end of a rope in a horizonta circ e at constantspeed. The rope breaks. Immediate y after the rope breaks, the bawi

    (A) fa straight down to the ground(B) move inward toward the center of the circ e(C) move outward norma to the circ e from the point the ropebroke(D) move outward tangent to the circ e from the point the ropebroke

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    95.

    96.

    97.

    98.

    99.

    19

    A 40,000 kg freight car is coasting at a speed of 5.0 m/s a ong astraight track when it strikes a 30,000 kg stationary freight car andcoup es to it. What wi be their combined speed after impact?(A) 6.7m/s(C) 2.1111/s (B) 2.9 m/s(D) 5.0 m/s

    Just before striking the ground, a 2.0 kg mass has 400 J of KB. Iffriction can be ignored, from what height was it dropped?(A) 200 111(C) 40.8 m (B) 20 in(D) 40111

    A 300 g mass at the end of a spring executes SI-IM with a period of2.4 s. Find the period of osci ation of a 133 g mass attached to thesame spring.(A) 1.68(C) 24.75 (B) 00333(D) 0413

    Standing waves are produced by the superposition of two waves with(A) the same amp itude, frequency, and direction of propagation(B) the same amp itude and frequency, and opposite propagationdirections(C) the same amp itude and direction of propagation, but differentfrequencies(D) the same amp itude, different frequencies, mid oppositedirections of propagation

    The speed of ight in a certain g ass is .9 >

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    61713100.

    101.

    K32.

    103.

    104.)

    20 I ITwo isotopes of an e ement have

    (A) the same number of nuc eons in their nuc ei(B) the same number of protons as we as neutrons(C) the same number of protons but a different number ofneutrons(D) different number of protons but the same number of neutrons

    Which of the fo owing effects cou d not be observed for sound wavesin air?(B) Refraction(D) Diffraction(A) Interference(C) Po arisation

    A capacitor with air between its p ates has capacitance of 3.0uF. Whatis its capacitance when wax of die ectric constant 2.8 is p aced betweenthe p ates?(A) 0.93 an (B) i.1)u~'(C) 25.2,u1: (D) 8.4uFTwo ong para e wires are 4 cm apart and carry currents of 2A and6A in the same direction. Compute the force between the wires permeter of wire ength

    (A) 6.0 X10" N / m , attraction(B) 6.0x 104 N / m , attraction(C) 2.5 x 10* N! m , attraction(D) 6.0 x 10's N/ m, repu sion

    In a U tube, 50.0 cm height of o ive oi in one arm is found to ba ance46.0 cm of water in the other. What is the density of the o ive oi ?

    (13) 1080 kg/mA) 920 kg/n13 (D) 0.920 kg/m3C) 230 kg/m

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    105.

    106.

    107.

    108.

    109.

    21The speed of a f uid flowing in a pipe of interna diameter of 5.0 cm is0.54 m/s. What wi be the flnid's speed in a pipe of 3.0 cm internadiameter that connects to it, both pipes flowing fu ?

    (A) 1.5 m/s(C) 0.19m/s (B) 0.9111/s(D) 0.32m/SPower in a DC circuit is measured by measuring the vo tage across andcurrent through the circuit. The vo tage and current measurement aremade to an accuracy of :!:2% and i3% respective y. The errors areimiting errors. The error in measurement of power is

    (A) a.~2%(C) 1% (B) -; :3%(D) 15%Two ba s of equa mass, moving with speeds of 3 m/s, co ide headon. Find the speed of each after impact if ('1) they stick together, (ii) theco ision is perfect y e astic.

    (A) (i) 3 m/s (ii) 0 in/s(B) (i) 6 m/s (ii) 6 m/s(C) (i) 0 mfs (ii) each rebounds at 3 m/s(D) (i) 1.5 m/s (ii) 1.5 in/s

    The exponentia function (1 = (]ce_URC describes(A) capacitor charging and discharging(B) capacitor charging(C) capacitor discharging(D) inductor current bui d up

    A constant vo tage source has(A) ow interna resistance (B) high interna resistance(C) minimum efficiency (D) minimum current capacity

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    61713110.

    H1.

    H2

    H3.

    H4.

    H5

    22According to Kirchoffs current aw

    (-A) no current can eave the junction without some currententering it(B) net current f ow at the junction is negative(C) tota sum of currents meeting at the junction is zero(D) the a gebraic sum of the currents at the junction is zeroIn a ntype semiconductor, the position ofFem1i eve

    (A) is ower than the centre of the energy gap(B) is at the centre of the energy gap(C) is higher than the centre of the energy gap(D) can be anywhere depending upon the doping concentration

    Twenty seven drops of mercury of equa size merge into a big drop.Assuming the drops to be spherica , the capacity of the bigger dropcompared to each drop is(A) 27 times(C) 9ti1nes (B) 3 times(D) 18times

    Four capacitors of equa capacity are connected in the form of asquare. The resu tant capacity across a side of the square is

    (A) 304(C) c (13) 4c(D) C/4The vo ume of the ba oon fi ed with hydrogen, which wi besufficient to ift a oad of 25 kg in air is (density of air and hydrogenare 0.00129 g/cc and 0.00009 g/cc)

    (B) 2.83 m(o) 0.283 m(A) 20.83 m3(C) 208.3 m3A pendu um c ock keeping correct time at sea eve is taken to a p ace1 km be ow sea eve The c ock approximate y

    (A) gains 13.5 3 per day (B) oses 13.5 s per day(C) oses 7 s per day (D) gains 7 s per day

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    116.

    117.

    118.

    119.

    120.

    121.

    23 t i |||An X~rayt11be operates at a vo tage of 40 kV. It emits continuousX-ray spectmm with a short wave ength imit 71,;

    (A) 0.031 11111(C) 3.1011111 (B) 0.3I0nn1(D) 3111111Four wires of same materia are stretched by t 1e sa111e oad. Thedimensions of t 1e wires are given be ow. Which of them wi e ongatethe most?

    (A) Length 100 cm and diameter 1 111111(B) Length 400 cm and diameter 0.5 mm(C) Length 200 cm and diameter 2 111111(D) Length 300 cm and diaineter 3 111111For constants 01 and [3 of a transistor

    (A) a

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    i6171322.

    123.

    124.

    125.

    126.

    24 I IWhat device is simi ar to RTD but has negative temperature coefficientof resistance?

    (B) Thermistor(D) Strain gauge(A) T herniocoup e(C) Negative RTDThe-output of a typica thermocoup e is

    (A) ess than 100 mV (B) ess than 100 mA(C) more than 1 vo t (D) ess than 100 OhmWhat is the zero-vo tage switch used for?

    (A) To reduce radiation of higher frequencies during turn on of ahigh current to oad(B) To contro ow vo tage C 1'C111 S(C) To provide power to a. circuit when power is ost(D) For extreme y ow vo tage app ications

    A ow pass RC fi ter acts as a pure integrator when ((0 is the app iedfrequency and 2' is the RC time constant)(A) rvrz(C) a)r>1(D) (or-=0

    A magnetic need e is kept in a non-uniform magnetic fie d. Itexperiences(A) a force and a torque (B) a torque but not a force(C) a force but not a torque (D) neither force nor torque

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    i 61713} 26 i131. The capacitor shown in the circuit is initia y charged. After c osingthe switch, how much time e apses unti one ha f of the capacitorsinitia stored energy is disp aced?

    .___../._............(." 1T LL;(A) RC (8) RC/2(C) RC n(2)/2 (D) 2RC n(2)ER132 T he ongest wave ength Xray that can undergo Bragg diffraction in actysta fora given fami y of p anes of spacing d is(A) 2d (B) d/2(C) d (D) 4d133. A ba is dropped from a height 11. As it bounces off the f oor, its speedis 80 percent of what it was just before it hit the f oor. The ba wirise to a height of most near y(A) 0.9411 (B) 0.3011(C) 0.751: (D) 0.6411134. Two springs S. and S2 have neg igib e masses and the spring constantof S. is 1/3 that of S2. When a b ock is hung from the springs as shownin the figure be ow, and the springs come to equi ibrium, then the ratio

    of work done in stretching S; to the work done in stretching S; is

    (A) 1/9 (13) 1/3(C) 1 (D) 3

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    135.

    I36.

    I37

    138.

    39.

    27 |||Equa resistances of 1000 each are connected in each arm of aWheatstone bridge, which is supp ied by a 2V battery. Aga vanometer of neg igib e resistance connected to the bridge cansense as ow a current as pA. The sma est va ue of resistance thatcan be measured is

    (A) 201110(C) 2011.!) (B) 21:9(D) 0.20Inversion temperature of a gas is the temperature above which

    (A) the gas shows coo ing effect whi e passing through a narroworifice(B) the temperature of the gas remains una tered whi e passingthrough narrow orifice(C) the gas shows heating effect whi e passing through a narroworifice(D) the gas can be iquefied

    An e ectron microscope is used to ook at an atom of 0 I run diameter.f the desired reso ution is 0.005 nm, the minimum energy of thee ectron shou d be

    (A) 0.957 eV (B) 6>

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    28 I140< The truth tab e given be ow is for (A and B are inputs, Y is output)

    YO0I

    (A) NAND gate(C) AND gate (B) XOR gate(D) NOR gate141. If the distance between the Earth and the Moon were ha ved, the forceof the attraction between them wou d be

    (A) one fourth as great (B) twice as great(C) one ha as great (D) four times as great142. Two identica springs with spring constant /c are connected to identicamasses of mass M, as shown in the Figures be ow. The ratio of the

    period for the springs connected in para e (Figure 1) to the period forthe springs connected in series (Figure 2) isV 1; ' 7 'iiio'9'oio'ci'ioi'o'ik Figure I Figure 2(A) - (B) :5(C) 1 (D) /5

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    143.

    M4.

    145.

    146.

    147.

    29 ImmmummuurnwiiWhich two of the fo owing circuits are high pass fi ters?

    I. .OWT---po Iin Out n OutF##___J_4iii. _1 IV.in Out In I OutL0 #4(A) I and H (B) I and III(C) I and IV (D) II and III

    If the sum of a forces acting on a moving object is zero, the objectwi(A) s ow down and stop its motion(B) acce erate uniform y(C) change the direction ofits motion(D) continue moving with constant ve ocity

    Fie d Effect Transistors (FETS) are(B) power driven devicestemperature driven devices(A) vo tage driven devices(C) current driven devices (D)

    Two capacitors of capacities 4uF and 6{LF are connected to a battery ofpotentia 10 V. The charge present in 4pLF is(A) 4#C(C) 6pC (B) 4oac(D) 60,u.C

    Two vibrating partic es that are "out of phase" differ in the phase oftheir vibration by(A) 1/4 cyc e (B)(C) 3/4 cyc e (D) 1/2 cyc e1 cyc e

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    B1713!

    I48.

    149.

    150.

    30 flTo convert a ga vanometer to a vo tmeter, you shou d add a

    (A) high resistancein series (B) ow resistance in series(C) high resistance in para e (D) ow resistance in para eThe potentia drop between the termina s of a battery is equa to thebatter)/'s EMF when

    (A) no current is drawn from the" battery(B) a veiy arge current is drawn from the batteiy(C) the intenia resistance of the battery is very arge(D) the resistance in the externa circuit is smaA transducer has an output impedance of kf and a oad resistance ofIQ. It behaves as

    (A) a constant current source(B) a constant vo tage source(C) a constant impedance source(D) a signa conditioner

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