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Py\outcomes have, , , , , , , , , , , oO 2 SS, It gives you a total nsight whether th, Not. After going through the ing NCEAT Tetons any, a "Ong, , , , , , , , , , , , , , , , , , , en achieved or, attem 5€ Questions in exam like » C { A _, Ons In & € environment. Gi eit four marks for COMER ane,, one mark for wi answer, & table ix » a eR, tk for w enswer A table is given at the end that will help you plan your next step, _ te, All the Best, Se., SUS REN 6. Aparallel plate capacitor with Plate area 4 and sey, Whic z between the plates d, is charged by ao ration, Vhich among the following does not represent Consid plane surfac : . 7 ee SUttey, Maxwell's equation? ider a plane surface of area A/2 Paralle) 4,, plates and drawn between the plates, ‘The displacen the, _— . m, (a) $£qd-4 current through the area is nen, &, 0 I, » fa) I (b} =, (b) fB.dd-o 2, I I, eer {c) (d) =, &) §eaj-—48 4 a, at, 7 Fy Displacement current goes through the gap between the, (d) fBdl= Hole + ip&y plates of a capacitor when the charge on the capacing, Me Be , fi (a) ischanging with time (b) decreases 4 |, axwell in his famous equations of electromagnetism fe) does not change (d) decreases to xem, introduced the concept of, {a) accurrent (b) displacement current 8. In order to establish an instantaneous displacemen:, (c) impedance {d) reactance current of | mA in the space between the plates of uF, parallel plate capacitor, the potential difference need tp, A plane electromagnetic wave travels in free space along apply is, X-direction, If the value of B(in tesla) at a particular fa) 100 ¥ st 200 V st, sad ; = {c) 300Vs? 500 Vs"!, point in space and time is 1.2 x 10-8K, the value of £ : i ;, {in Vm ') at that point is 9. The conduction current is same as displacement cument, (a) 1.27 (b) 3.6K when source is, f (d) 463 j (a) aconly {b) de only, (Ce e's } 36) {c) either ac or dc (d) neither de nor ac, If a variable frequency ac source is connected to 10. A capacitor made of two circular plates each of radius, , a capacitor then with decrease in frequency the, displacement current will, , (a) increase, (b) decrease, , (c) remains constant, , (d) first decrease then increase, , The charge ona parallel plate capacitor varies as, , = cos2nut, The plates are very large and close, pain (area = A, separation = d). ‘The displacement, current through the gap *, @ q2msnmt ©), (c) gy2% sinteut, , ~ Gy 2m sin2rut, go™y sin2mvt, , 12 cm and separated by 5 mm, The capacitor is being, charged by an external source. ‘The charging eurmelt, is constant and equal to 0,15 A. The capacitance of &, , parallel plate capacitor is !, \ \, = Vs —j! }, wd, (a) 40 pF (b) 45 pF Ig., (c} 70 pF (d) 80 pF

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Waves, , juestion Number 14,, , , , , el th, Te OTtwCeR the plate eRe f 179, x10 Vise of 5, oV (b) 1g | Pete, a (d) 435 Vet S m1025 m (b) 30m to25m, WA Wer Smto lam id) Wmtosm, , 19, An, ¢l ne, Iectromagnetic wave of intensity J falls on a surface, “o sacuum and exerts radiation pressure P on it., , | Which of the fo, , , , , , , , , , , , , , , , , , , , , fy, be the permeability and the, , , , , , ; the ive { mitt lowing statement is not true?, Podium, then its Tefractive index is given bp ivity of a fa) vm Presure-is dic if the wave {9° totally, 1 ul,, a 1 h abs, hat ® ie } i — Pressure is Sic if the wave is totally, 0 c, ip () Radiation, ressure is 2 Ne vave is totally, ! (dy Hoey Teflected, Pressure is 2 Nc if the wave is totally, ujectromagnetic wave consists of per) Aree td) a Pressure isin the range Ie <p > 2 Sie for, dectric and magnetic Vectors ly oscillating surfaces,, , in mutually perpendicular planes 20, A plane cleetromay, , p but vibra ehetic wave of frequency 25 MHz, with a phase difference of x vibrating sa in free space along x-direction. At a particular, 1 mutually perpendi fit 1N space and time, electric field E= 63 V m2 Th, H) ¥ Perpendicular planes but vibrating Magnitude of magnetic feld Bat this pointis, with a phase difference of = j {ay Lx ey tb) 1.210" T, 2 (c) 21x10 °T (d) 21x10! T, , n randomly oriented planes Fie ae Fe f, phase e Dut vibrating in 21, Which of the following statement is false for the, , i i ; ‘ Properties of electromagnetic waves?, , dj in nutty perpendicular planes but vibrating in {a} Both electric and rasa field vectors attain the, , phase; maxima and minima at the same place and same, time., , {b) The energy in electromagnetic wave is divided, equally between electric and magnetic field, , : About 6% of the power of a LOO W light bulb is, ted to visible radiation. The average intensity, , , , , , cod, , f visible radiation at a distance of 8 m is (Assume vectors,, , hut the radiation is emitted isotropically and neglect {ce} Bothelecteicand magnetic held vectors are parallel, eilection ‘ to each other and perpendicular to the direction, i) 335x107 Wm (b) 51x10? Wor? of propagation of wave, , |, , x 107 Wm (d} 2.3% 10-7 Wm? } {d) ‘These waves do not require any material medium, i for propagation., , . 4 plane electromagnetic wave travels in vacuum along, , ion. Ifthe frequency ofthe waveis40Milzthen | 22. A plane electromagnetic wave is incident on a material, , surface, The wave delivers momentum p and energy E., , , , , , avelength is fe, v3 (b) 73. j (a) p20, EO (b) p=0,£=0, \) 85m (a) 10m | (c) p=0,E40 (gd) p#0,E=0, , 4 charge, when , rae, ource of electromagnetic waves can Bt 23, Which of the following has/have vero average value, , at nee, a) moving with a constant velocity plane electromagnetic wave? I, b) moving in a circular orbit (a) Both magnetic = electric fields, C) falling in an electric field i (b) Electric as a, ‘¢) bath (b) and (ce) {c} Magnetic held only, , electromagnetic | {d) None of these, , electric field associated with on ke 61081)! ), , of an electromagnetic Wave, , , , = electric field ,, in vacuum is given by B= 40 derpater andsecond 4 ae through vacuum is a tee, ete E,zand fare in volt pet earls j = Ey sin (kx - om). The quantity, , “i “o ies as ‘of wavelength is, aad (a) ko, sation jn 7.5 MHz to 12 MHz, wavelength band is, ‘nd, The corresponding, , ee, eel, , eo, =, , {c) Fw

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the electric field of the light coming, p72 8 6 Te trae ft nergy, Bra {b) 458x10%Jm>, , s¢xio’tm? = {dh 81.35 x10? fm,, , , , , , Miah Sa vee ta vacuum is By = 510 nT. The, ‘of the electric field part of the wave is, , @ 2oNC! b) 134NC?, , fe) SINC" (4) 153NC, , Radiations of intensity 0.5 W m- are striking a metal, ., , re on the plate is, ¥ Byiaicxw' Nm? (b) 0.332% 10*Nm2, , {c) o1x10$Nm? — (d) 0.083 x 10*Nm*, , fe, , hom?, , 28. Light with an energy flux of 18 W cm ? falls on a non, sh surface at normal incidence, If the surface, , has an area of 20 cm’, the average force exerted on the, surface during 4 30 minute time span is, , (a) 21x 10°N (b) 12x 10*N, (c) 1.2% 10°N (d) 2.1.x 10°N, 29. Assume a bulb of efficiency 2,5% as a point source. The, , peak values of electric and magnetic fields produced by, the radiation coming from a 100 W bulb at a distance of, 3m is respectively, , (a) 25V or! 3.6 x 104T, , (b) 42Vm',28x 10*T, , (cs) 4.08V m4, 1.36 10°T, , (2) 36Vm'.42% 10% T, , A plane electromagnetic wave Propagating along, 2 direction can have the following pairs of E and B, , (a) EB. (b) £..B,, , () £8, (¢) both (a) and (b), , Acharged Particle oscillates about its mean equilibrium, , “ate with a frequency of 10° Hz, The frequency, Homagnetic waves produced by the oscillator is, , fa) to Hz (b) 107 Hz, , Aol set tte {d) 10" Hz, , 32. In the above ‘, question, the i, () wilhawan. a Screen waves, , . will have @ wavelength of 0.3 m, 1 fallin the Tegion of radiowaves, , , , , ri, (d) all ofthese, , The magnet,, ie: ss sean < sone emerging from a filter, Beet 120107 acaly gale pera, (3) rrr ofthe beam i, UW ne, War (by) 2.1Wm?, hed @) 29Wm2, , , , , , , P of the magnetic field of a harmonic |, , | ag-cTHe photon’ enetgy ta /aditr rele, , , , , , , , (a) 13.29 x 10°?, (co) 17.72 10-2, , 35. Anelectromagnetic wave of, from vacuum into a dielectric, €=4, Then a, (a) wavelength and frequency b, (b) wavelength is doubled, unchanged., wavelength and, unchanged,, wavelength is halved, unchanged., , 36. Which of the following is not eru, waves?, fa) They transport energy., (b) They have momentum. 4, (c) They travel at different speeds ing, , their frequency. v, , They travel at different sp, , depending on their frequency., , , , , , , , , , , , , , , (c), {d), , (d), , waves of wavelength 2 cm is, fa) 25x10?, {c) 32x 107-6, , 38. IfEand Bdenote electricand m:, which of the following is dime!, , fa) fice 5, , , , , , (Ry, (c) Moto| = |, , 39, The amplitude of an 0, is doubled with no other changes, a result of this doubling of the an, following statement is correct?, (a) ‘The speed of wave propagation:, {b) The frequency of the wave chan, {c) The wavelength of the wave, (d}_ None of these,, , , , , , 40. An electromagnetic wave is prop, At x= 1 mand t= 105, its electric, then the magnitude of its magnetic, (a) 2x10°T :, , @) 6x10°T, , , , , , e, Y, , B., , %,, , |. A plane, , travels i, point in, B is eq, , fa)

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182, , 55, Which waves, (a) Microwaves, fc) Radio waves, , Which of the following electromagnetic wave is used in, , d in sonography ?, a teh nicer ape, , (d} Ultrasonic waves, , ae ision application like LASIK eye surgery?, - ane {b) Ultraviolet rays, ia Gamma rays {d) X-rays, , ‘i, aA electromagnetic wave is used as in, {a} television waves ', , th) cellular phone communication, {cl commercial FM radio, , id) both (a) and (c), , 58, Which of the following electromagnetic waves has, smallest wavelength?, fa) X-rays (b), {c] ‘f-rays (d}, , Microwaves, Radiowaves, , 59. An electromagnetic radiation has an energy of 13.2 keV,, Then the radiation belongs to the region of, fa} visible light (b} ultraviolet, (co) infrared fd) X-ray, 60. A. Wavelength of microwaves is greater than that of, ultraviolet rays., B. The wavelength of infrared rays is lesser than that, of ultraviolet rays,, , C. The wavelength of microwaves is lesser than that of, , infrared rays, , Gamma ray has shortest wavelength in the, clectromagnetic Spectrum, , Choose the correct option from the given options,, , (a) Aand Bare true {b) Band Care true, (Cand Dare tre (d) Aand D are true, , Db., , SL. Which of the tollowin;, in medicine to destroy cancer cells?, e a rays (b] Visible rays, ‘} Gamina rays (4) Ultraviolet rays, , 62 Xe 5 ,, 2, ii and y-rays of same energies are distinguished by, Pcie, a frequency (b) charges, sie : Tonising power {d) method of production, , The vltra high frequency band of radiowaves in | 65 Which of the following clectromagnetic, , | 66. If v, vy and v,, are the speeds of gamma, , 69. A microwave and an ultrasonic sound., , ig electromagnetic waves is used i, , , , , , , 63. The crystal structure can be studied, (a) UV rays (b) X., (c) IR radiation (d) Micy, , , , 64. The waves used by artificial satellit, is, fa) microwaves, (c) radio waves, , 3 for cy 7, , , , , , , , , , , , , , , , , , , , , , important role in maintaining the, average temperature through the preenho, (a) Visible rays (b), te) Gamma rays, , and microwaves respectively in, (a) Ve SV SV yy {b} Ve? ¥, fc} Vg > Vx < Ven id) Ve= ys, , 67. Frequency of radiations arising from, levels in hydrogen, known as lamb shift, ‘This frequency falls in which range of, wave?, , (a) Infrared rays, {c) y-rays, , 68. X-rays, gamma rays and microwaves, vacuum have “et, (a) same wavelength but different veloc, (b) same frequency but different, (c) same velocity but different wavelen, (d} same velocity and same frequency ,, , , , , , , , , , , , , , , same wavelength. Their frequencies are |, (approximately) >, (a) 10 (b) 10%, fe) 10% {d) 108, , 70, Radio waves diffract around buildings, E, waves do not. The reason is that radio bi, {a) travel with speed larger than c od, (b) have much larger wavelength than, {c) are not electromagnetic waves, (d) none of these