Physics – Class 12 Mock Test 6

1. What is the reactance of an inductor in a dc circuit?

2. A series circuit with L = 0.12 H, C = 0.48 mF and R = 25 Ω is connected to a 220 V variable frequency power supply. At what frequency is the circuit current maximum?

3. What is measured by the eddy currents induced in energy meters?

4. In which type of circuit the value of power factor will be minimum?

5. When a sinusoidal voltage E = 200 sin 314 t is applied to a resistor of 10 Ω resistance, the power dissipated is 250 Watts.

6. What is the reactance of an inductor in a dc circuit?

7. Which of the following is not an application of eddy currents?

8. A capacitor of capacitance 10 μF is connected to an oscillator giving an output voltage, E = 10 sin ωt volt. If ω = 10 rad s^-1, find the peak current in the circuit.

9. An inductor coil joined to a 6 V battery draws a steady current of 12 A. This coil is connected in series to a capacitor and ac source of alternating emf 6 V. If the current in the circuit is in phase with the emf, find the rms current.

10. What will be the rms value of the voltage, if the sinusoidal value voltage is given as E = 100 sin 314 t applied across a resistor of resistance 15 ohms?