Alternating Current PYQs Set 7 (PDF)

Set 7 of 9 · Questions 181-210 of 244

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Mere Teacher · Previous Year Questions NEET Physics · Alternating Current · Set 7 (Q181-210)
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181. $A capacitor of capacitance 100 μF and a coil of resistance 20Ω and inductance 12.5 mH are connected in series with a 220 V, \frac{200}{π} Hz AC source: The maximum value of instantaneous current in the circuit is$ (1) $20 A$ (2) $10 A$ (3) $11 A$ (4) $15 A$ 182. $In the series LCR circuit shown, the impedance is$ (1) $200Ω$ (2) $100Ω$ (3) $300Ω$ (4) $500Ω$ 183. $In the A.C. circuit shown, keeping ' K' pressed, if an iron rod is inserted into the coil, the bulb in the circuit$ (1) $gets damaged$ (2) $glows less brightly$ (3) $glows with same brightness (as before the rod is inserted)$ (4) $glows more brightly$ 184. $In the following circuit an AC input Vi (t) = (20 mV) sin (10^{5} t) is applied at the left end. The amplitude of the output voltage V_{0} at the right end across the capacitor will be$ (1) $14.14 mV$ (2) $10.55 mV$ (3) $20.2 mV$ (4) $25.55 mV$ 185. $An ideal resistance R, ideal inductance L, ideal capacitance C and AC volt meters V_{1}, V_{2}, V_{3} and V_{4} are connected to an AC source as shown. At resonance,$ (1) $reading in V_{3} = reading in V_{1}$ (2) $reading in V_{1} = reading in V_{2}$ (3) $reading in V_{2} = reading in V_{4}$ (4) $reading in V_{2} = reading in V_{3}$ 186. $In LC circuit the inductance L = 40 mH and capacitance C = 100 μF . If a voltage V (t) = 10 sin (314 t) is applied to the circuit, the current in the circuit is given as:$ (1) $0.52 cos 314 t$ (2) $10 cos 314 t$ (3) $5.2 cos 314 t$ (4) $0.52 sin 314 t$ 187. $A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when:$ (1) $number of turns in the coil is reduced.$ (2) $a capacitance of reactance X_{C} = X_{L} is included in the same circuit$ (3) $an iron rod is inserted in the coil$ (4) $frequency of the AC source is decreased$ 188. $In the given electrical circuit, if the switch S is closed then the maximum energy stored in the inductors is:$ (1) $3 J$ (2) $9 J$ (3) $12 J$ (4) $6 J$ 189. $Total impedance of a series LCR circuit varies with angular frequency of the AC source connected to it as shown in the graph. The quality factor Q of the series LCR circuit is$ (1) $0.4$ (2) $2.5$ (3) $5$ (4) $1$ 190. $Find the peak current and resonant frequency of the following circuit (as shown in figure)$ (1) $0.2 A and 100 Hz$ (2) $2 A and 50 Hz$ (3) $2 A and 100 Hz$ (4) $0.2 A and 50 Hz$ 191. $For a series LCR circuit, I vs ωrcurve is shown: (A) To the left of ωr, the circuit is mainly capacitive. (B) To the left of ωr, the circuit is mainly inductive. (C) At ωr, impedance of the circuit is equal to the resistance of the circuit. (D) At ωr, impedance of the circuit is 0. Choose the most appropriate answer from the options given below:$ (1) $(A) and (D) only$ (2) $(B) and (D) only$ (3) $(A) and (C) only$ (4) $(B) and (C) only$ 192. $Figure shows a circuit that contains four identical resistors with resistance R = 2.0Ω . TWo identical inductorswith inductance L = 2.0 mH and an ideal battery with emf E = 9. V . The current ’ i ’ just after the switch ’ s ’ isclosed will be:$ (1) $9 A$ (2) $3.0 A$ (3) $2.25 A$ (4) $3.37 A$ 193. $An ac voltage of 10 sin ωt volt is applied to a pure inductor of inductance 10 H . The current through the inductor in ampere is$ (1) $\frac{1}{ω} sin (ωt - \frac{π}{2})$ (2) $ω sin (ωt - \frac{π}{2})$ (3) $\frac{1}{ω ^{2}} sin (ωt - \frac{π}{2})$ (4) $ω^{2} sin (ωt - \frac{π}{2})$ 194. $A resistor and a capacitor are connected in series with an a.c. source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, the applied voltage is$ (1) $13 V$ (2) $17 V$ (3) $5 V$ (4) $12 V$ 195. $A coil of negligible resistance is connected in series with 90Ω resistor across 120 V, 60 Hz supply. A voltmeter reads 36 V across resistance. Inductance of the coil is:$ (1) $0.286 H$ (2) $0.76 H$ (3) $2.86 H$ (4) $0.91 H$ 196. $An RC circuit as shown in the figure is driven by a AC source generating a square wave. The output wave pattern monitored by CRO would look close to:$ (1) (2) (3) (4) 197. $The readings of ammeter and voltmeter in the following circuit are respectively$ (1) $2.7 A, 220 V$ (2) $1.2 A, 120 V$ (3) $2.2 A, 220 V$ (4) $1.5 A, 100 V$ 198. $In the given circuit, rms value of current (I_{r m s}) through the resistor R is:$ (1) $2A$ (2) $\frac{1}{2} A$ (3) $20 A$ (4) $22 A$ 199. $A series L,R circuit connected with an ac source E = (25 sin 1000 t) V has a power factor of \frac{1}{2} . If the source of emf is changed to E = (20 sin 2000 t) V, the new power factor of the circuit will be:$ (1) $\frac{1}{2}$ (2) $\frac{1}{3}$ (3) $\frac{1}{5}$ (4) $\frac{1}{7}$ 200. $In the given circuit, the resomant frequency is$ (1) $1592 Hz$ (2) $15910 Hz$ (3) $15.92 Hz$ (4) $159.2 Hz$ 201. $At very high frequencies, the current (i) in the given circuit is$ (1) $4 A$ (2) $0.4 A$ (3) $44 A$ (4) $4.4 A$ 202. $For an RLC circuit driven with voltage of amplitude υ_{m} and frequency ω_{0} = \frac{1}{LC} the current exhibits resonance. The quality factor, Q is given by:$ (1) $\frac{R}{( ω _{0} C )}$ (2) $\frac{CR}{ω _{0}}$ (3) $\frac{ω _{0} L}{R}$ (4) $\frac{ω _{0} R}{L}$ 203. $In a series LCR circuit, the inductive reactance (X_{L}) is 10Ω and the capacitive reactance (X_{C}) is 4Ω . Theresistance (R) in the circuit is 6Ω. The power factor of the circuit is:$ (1) $\frac{1}{2}$ (2) $\frac{1}{2 2}$ (3) $\frac{1}{2}$ (4) $\frac{3}{2}$ 204. $An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance R are connected in series to an AC source of potential difference V volts as shown in figure. Potential difference across L, C and R is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through L - C - R series circuit is 102 A . The impedance of the circuit is [NEET 2021]$ (1) $42 Ω$ (2) $52 Ω$ (3) $4Ω$ (4) $5Ω$ 205. $What will be the reading in the voltmeter and ammeter of the circuit shown?$ (1) $90 V, 2 A$ (2) $0 V, 2 A$ (3) $90 V, 1 A$ (4) $0 V, 1 A$ 206. $A series R - C circuit is connected to an alternating voltage source. Consider two situations(A) When capacitor is air filled.(B) When capacitor is mica filled. Current through resistor is i and voltage across capacitor is V, then$ (1) $V_{A} < V_{B}$ (2) $V_{A} > V_{B}$ (3) $i_{A} > i_{B}$ (4) $V_{A} = V_{B}$ 207. $In the given circuit the peak voltages across C, L and R are 30 V, 110 V and 60 V respectively. The rms value of the applied voltage is$ (1) $70.7 V$ (2) $141 V$ (3) $100 V$ (4) $200 V$ 208. $A branch of a circuit is shown in the figure. If current is decreasing at the rate of 10^{3} As^{- 1}, then the potential difference between A and B is$ (1) $1 V$ (2) $5 V$ (3) $10 V$ (4) $2 V$ 209. $A series AC circuit containing an inductor (20mH), a capacitor (120μF) and resistor (60Ω) is driven by an AC source of 24 V/50 Hz. The energy dissipated in the circuit in 60 s is:$ (1) $5.65\times10² J$ (2) $2.26\times10³ J$ (3) $5.17\times10² J$ (4) $3.39\times10³ J$ 210. $For the given input voltage waveform V_{in} (t), the output voltage waveform V_{0} (t), across the capacitor is correctly depicted by$ (1) (2) (3) (4)