Recent questions tagged #mcq

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A coil of inductance 8.4 mH and resistance `6Omega` is connected to a 12 V battery. The current in the coil is 1A in the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Alternating current can not be measured by dc ammeter

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The resistance of a coil for dc is in ohms. In ac, the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An alternating current of rms valuve 10 A is passed through a `12_Omega` resistance. The maximum potential difference across the resistor

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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220 V,50 Hz, ac is applied to a resistor. The instantancous value of voltage

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The rms value of an ac of 50 Hz is 10 amp.The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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If a current I given by `I_O sin(omegat-pi/ 2)` flows in an ac circuit across which an ac potential of `E = E_O sinomegat` has been applied, then the power consumption p in the circuit will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In general in an alternating current

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An alternating current is given by the `eq^n` I = I1 coswt + I2 sinwb. The rms current is given

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In an ac circuit, the current is given by `I= 5sin[ 100 t -pi/2]` and the ac potential is `V = 200 sin 100t`. Then the power consumption

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In ac circuit with voltage V and current I, the power dissipaled

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the transmission of a.c. power through transmission lines, when the voltage is shapped up n times, the power loss in

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An alternating voltage is represented as `E = 20 sin 300t`. The average value of voltage over one cycle will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The instantancous voltage through a device of impedance `20Omega` is `ε= 80 sin100π t ` . The effective value of the current

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A choke coil

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A resistor and a capicitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, the applied voltage

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In an ac circuit the emf (e) and the current (i) at any instant core given respectively by `e = E_O sinomegat`, `I= I_o sin (ωt- φ)` The average power in the circuit over one cycle of ac

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The instanteneous value of current in an A.C. circuit is `I= 2sin (100pi t+pi/3)A`. The current will be maximum for the first time

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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