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1. Figure shows a circuit that contains three, identical resistors with resistance R = 9.0 Q, each, two identical inductors with, inductance L = 2.0 mH each, and an ideal, battery with emf e= 18 V. The current i, through the battery just after the switch, , , , , , , , , , closed is [NEET 2017], , L 3A R, +, ‘=, R i Cc, Z J, (a)2mA (b)O.2A, ()2A (d)04, , 2. In an electromagnetic wave in free space, the root mean square value of the electric, field is E,,., = 6 V/m. The peak value of the, , magnetic field is INEET 2017], (a) 1.41x 10° T (b) 2.83 10% T, (c) 0.70x 10 T {d) 4.23x 107 T, , 3. Out of the following options which one, can be used to produce a propagating, electromagnetic wave? INEET 2016}, (a) A stationary charge, (b) A chargeless particle, (c) An accelerating charge }, , (d) A charge moving at constant velocity, , 4. An inductor 20 mH, a capacitor 50 uF and, , ‘aresistor 40 Q are connected in series, across a source of emf V = 10sin 340 ¢. The, , power loss in AC circuit is INEET 2016), (a) 0.67 W (b) 0.76 W, (c) 0.89 W (d) 0.51 W, , 5. Which of the following combinations, should be selected for better tuning of an, L-C-R circuit used for communication?, , {a) R=202,L=J5HC = 35 pF INEET 2016}, {b) A =250, L @2.5H,C = 45 pF, {c) 8=15Q2,L=35H,C = 30 pF, (d) R =250', Lb =15H,C = 45 pF, , "6. The potential differences across the, resistance, capacitance and inductance are, 80 V, 40 V and 100 V respectively in an, L-C-R circuit. The power factor of this, , circuit is [NEET 2016], (a) 0.4 (b) 0.5 :, {c) 0.8 (d) 1.0 %, , Ss, 7. A100 Q resistance and a capacitor of 100, , © reactance are connected in series across, a 220 V source. When the capacitor is, , charged, the peak value of the she, displacement current is INET 2016), {a) 224 (b) 11A :, , {c) 4.4A (d) 11V2A

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§. Aresistance ‘R’ draws power ‘p*, connected to an AC seta tt we, is now placed in series with the resist =o, such that the impedance of the ~—, becomes ‘Z’ the power drawn will be, , ay R ICBSE AIPMT 2015], ar(3) Mrs (3) we, , 9, Aseries R-C circuit is connected to an, alternating voltage source. Consider two, situations : [CBSE AIPMT 2015}, , 1. When capacitor is air filled,, 2. When Capacitor is mica filled., Current through resistor is i and voltage, across Capacitor is V then, @y<% DM>Y Cisri, WY=aVYy, , 10. The energy of the EM waves is of th, of 15 keV. To which part of the en, , does it belong? [CBSE AIPMT 2015), (a) X-rays (b) Infrared rays, (c) Ultraviolet rays (d) y-rays, , 11, A transformer having efficiency of 90% is, working on 200 V and 3 kW power supply., If the current in the secondary coil is 6 A,, the voltage across the secondary coil and, the current in the primary coil respectively, are [CBSE AIPMT 2014], , (a) 300 V, 15A (b) 450 V, 154, (c) 450V, 13.5A (d) 600 V, 154, , 12. A coil of self-inductance L is connected in, series with a bulb B and an AC re, Brightness of the bulb decreases when, , : [NEET 2013], {a) frequency of the AC source Is decreased, (b) number of turns in the coil is red, (c) a capacitance of reactance X- = X, is, included in the same circuit, (d) an iron red is inserted in the coil, , 13. The condition under which a microwave, oven heats up a food item containing —_, molecules most efficiently is (NEET ., , (a) the frequency of the microwave must =, the resonant frequency of the water Ce, (b) the frequency of the microwave = othe, with natural frequency of water MO a > sce, {c) microwave are heat waves, so alway p, heating ., (d) infra-red waves produce heating in a, microwave oven, , 14, In an electrical circuit, R, L,C and an AC, voltage source are all connected in series., When L is removed from the circuit, the, phase difference between the voltage and, the current in the circuit is n/3. If instead,, C is removed from the circuit, the phase, difference is again 7/3. The power factor of, , the circuit is [CBSE AIPMT 2012], (a2 (0) 12, (o)1 (a) 3/2, , 15. The electric field associated with an electro, magnetic wave in vacuum is given by, E = 40cos(kz - 6 x 10°t), where £,z andt, , are in voli/m, metre and second, respectively. The value of wave vector k is, , [CBSE AIPMT 2012], (a)2m" (0) 0.5m"!, (c) 6m" (a) 3m", , 16. The electric and the magnetic field,, associated with an electromagnetic wave,, propagating along the +z-axis, can be, represented by [CBSE AIPMT 2011], (a) [E = Ek. B= Bai], , (0) (E = E, j, E = Bi), , (c) [E= Ep), B= ak), (d) [E = E51, B= 81), , 17. Inan AC circuit an alternating voltage, e = 200 V2 sin 100 t volt is connected toa, capacitor of capacity 11F. The rms value of, the current in the circuit is [CBSE AIPMT 2011], , (a) 100 mA (b) 200 mA, (c) 20mA (d) 10 mA, , 18. An AC voltage is applied to a resistance R, and an inductor L in series. If R and the, inductive reactance are both equal to3 9,, the phase difference between the applied, voltage and the current in the circuit is, , (CBSE AIPMT 2011}, , (b) n/2 {c) zero (d) 6, , 19. The decreasing order of wavelength of, infrared, microwave, ultraviolet and, gamma rays is [CBSE AIPMT 2011], (a) gamma rays, ultraviolet, infrared, microwaves, , (b) microwaves, gamma rays, i ultraviolet, (c) infrared, microwave, teckel soma rye, , {d) microwave, infrared, ultraviolet, garam rays, , {a) W4

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20. Which of the following statement is false, for the properties of electromagnetic, waves? [CBSE AIPMT 2070], (a) Both electric and magnetic field vectors attain, the maxima and minima at the same place and, same time ', , (b) The energy in electromagnetic wave is divided, equally between electric and magnetic vectors, , (c) Both electric and magnetic field vectors are, parallel to each other and perpendicular to the, direction of propagation of wave, , (d) These waves do not require any material, medium for propagation, , 21. In the given circuit, the reading of, voltmeter V, and V, are 300 V each. The, reading to the voltmeter V, and ammeter A, are respectively (CBSE AIPMT 2010], , L, , Cc, wn, Lo Tete, , , , , , , , , , ®, , , , , , , , (a) 150V,2.2A (b) 220 V, 2.24, (c) 220 V, 2.04 (d) 100 V, 2.04, , 22. A 220 V input is supplied to a transformer., The output circuit draws a current of 2.0 A, at 440 V. If the efficiency of the transformer, is 80%, the current drawn by the primary, , windings of the transformer is, [CBSE AIPMT 2010], , ()25A (G)5.0A, , (a) 36A (b)28A, , 23. Power dissipated in an [-C-R series circuit, connected to an AC source of emf € is, , eR, , (a), ——_-"—_,, [* + (tw- a), , [CBSE AIPMT 2009}, , , , 24. The electric field part of an, , electromagnetic wave in a medium is, represented by E, = 0;, , N grad, , 2 =, , B, =28.cos{(2" «10 = }, , - (= x107? mats =0, The wave is, s, , [CBSE AIPMT 2009), (a) moving along y-direction with frequency, 2" x 10° Hz and wavelength 200 m, {b) moving along x-direction with frequency 10° Hz, , and wavelength 100m, (c) moving along x-direction with frequency 10° Hz, , and wavelength 200 m, {d) moving along ~ x-direction with frequency, , 10° Hz and wavelength 200 m, 25. In an AC circuit the emf (V) and the, current (i) at any instant are given, respectively by, V =V,y sin wt, i =ig sin (wt - 9), The average power in the circuit over one, , cycle of AC is {CBSE AIPMT 2008], Voi Voi,, at A0'8 gi, , (a) 2 (b) 5 sing, , (c) “0 cos @ (8) Moin, , 26. The velocity of electromagnetic radiation, in a medium of permittivity ¢, and, permeability 1, is given by, , jis [CBSE AIPMT 2008], (a) | (fice, (J) i, Wo ee Fiote Vey, , 27. A transformer is used to light a 100 W and, 110 V lamp from a 220 V mains. If the, main current is 0.5 A, the efficiency of the, transformer is approximately, {CBSE AIPMT 2007] _, (a) 30% = (6) 50% — (c) 90% +—(d) 10%, , 28. The primary and secondary coils of a, transformer have 50 and 1500 turns a:, respectively. If the magnetic flux @linked, with the primary coil is given by, $ = $9 + 42, where is in weber, ¢ is time in, second and 9, is a constant, the output, , voltage across the secondary coil is, [CBSE AIPMT 2007], , ()30V0, a, , ce, , Fa sa agernr, , , , , , (a)90¥ = (b) 120¥. (ce) 220

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29. What is the value of inductan,, which the current is maximum: in —_, , LCR ciroult with C=10pF and, @ = 1000s"?, CBs, anni E AIPMT 2007], (b) 1 mH, , (c) Cannot be calculated un! i, (a) 10 mH less R is known, , 30. A coil of inductive reactance 31 © has a, , resistance of 8Q. It is placed in series with, , a condenser of capacitative reactan,, The combination is connected to =i “, , source of 110 V. The power factor of the, , circuit is [CBSE AIPMT 2006}, (056 — (0)0.64 = (0.80 = (d) 0.33, , 31, The core of a transformer is laminated, , because [CBSE AIPMT 2006}, , {a) energy losses due to eddy currents may be, minimised, , (0) the weight of the transformer may be reduced, , (c) rusting of the core may be prevented, , (dc) ratio of voltage in primary and secondary may, be increased, , 32. IfK,,%, and 2,, represent the wavelengths, of visible light, X-rays and microwaves, , respectively, then [CBSE AIPMT 2005], (A) Rim > Ay > Ay (b) Ay > Am >A, (C) Am > Ay > Ax (d) Ay > Ay >Am, , 33. In acircuit, L,C and R are connected in, , series with an ene baa — of, , frequency f. The current leads the voltage, , by a5" The value of C is cage Aent ae, 1, , (a) DaleniL + A) (bo) wipel.+ A), 1 ace iage rene, Ormea-h © weRt-Fi, , 34, Which of the following rays are not, , , , electromagnetic waves? [CBSE AIP IMT 2008!, (a) Berays (b) Het yey, (c) X-rays era, loss at, 35, For a series LCR circuit, the power, resonance is {CBSE AIPMT 2002], —“ : (p)? Co, ei, , eC ve, , (ih (d) we, , 36, Which of the following has minimum, , wavelength 7 (CBSE AIPMT 2002], (a) X-rays (d) Ultraviolet rays, (c) y-rays (a) Cosmic rays, , 37. The velocity of electromagnetic wave is, , along the direction of [CBSE AIPMT 2002], (aBxE (b)ExB (cj)E (dB, , 38. What is the cause of “Green house effect"?, {a) Infrared rays [CBSE AIPMT 2002], (b) Ultraviolet rays, {c) X-rays, (d) Radio-waves, , 39, In a certain region of space electric field E, and magnetic field B are perpendicular to, each other and an electron enters in region, perpendicular to the direction of Band E, both and moves undeflected, then velocity, , of electron is case ‘AIPMT 2001], lel Exe (cB E-B, (a) ipl (KE x ( EI (d), , 40. The reactance of a capacitor of capacitance, Cis X. If both the frequency and, capacitance be doubled, then new, , reactance will be {CBSE AIPMT 2001}, (a) X (b) ¥ x, (c) 4x (a) mi, , 41. A wire of resistance R is connected in, series with an inductor of reactance @ L., Then quality factor of RL circuit is, , {case AIPMT 2000), @t (o) 2, ol a, , wl, , R, (c), eee OR at, , 42. The frequency of y-rays, X-rays and, , ultraviolet rays are a, b and ively., Tien, and c respectively, , [CBSE AIPMT 2000], (a)a>b>c (D)a<b<c, (ja=beac (dja>c>b, , 43, In a circuit inductance L and capacitance C, are connected as shown in figure. A, and, A, are ammeters. When key K is pressed to, complete the circuit, then just after closing, , key (X), the reading of curren PMT 1999)

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Ay c Ry, ~O—4 bk —weL fe, (?\, 2, ae I, Battery, , (a) Zero in both A, and A,, , (b) maximum in both A, and A,, (c) zero in A, and maximum in A,, (d) maximum in A, and zero in Ay, , 44, The electromagnetic radiations are, caused by [CBSE AIPMT 1999], , (a) a stationary charge, , (b) uniformly moving charges, (c) accelerated charges, , (d) All of the above, , 45. Ozone layer blocks the radiations of wave, length [CBSE AIPMT 1999], , (a) less than 3 x 107? m, (b) equal to 3x 10°? m, (c) more than 3 x 10-? m, (d) All of the above