MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A capacitor, resistor of 10 Ω, and an inductor of 70 mH are in series with an ac source marked 120 V, 70 Hz. If it is found that voltage is in phase with the current, then find out the impedance of the circuit. |
| A. | 5 Ω |
| B. | 10 Ω |
| C. | 100 Ω |
| D. | 900 Ω |
| Answer» C. 100 Ω | |
| 2. |
Voltages across L and C in series are 90° out of phase. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
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? |
| A. | 79 Hz |
| B. | 19 Hz |
| C. | 21 Hz |
| D. | 93 Hz |
| Answer» D. 93 Hz | |
| 4. |
A resistor of 50 Ω, an inductor of \(\frac {20}{\pi}\) H and a capacitor of \(\frac {5}{\pi }\) μF are connected in series to a voltage supply of 230 V – 50 Hz. Find the impedance of the circuit. |
| A. | 150 Ω |
| B. | 250 Ω |
| C. | 350 Ω |
| D. | 50 Ω |
| Answer» E. | |
| 5. |
If a 0.5 H inductor, 80 μF capacitor and a 40 Ω resistor are connected in series with a 150 V, 60 Hz supply. Calculate the impedance of the circuit. |
| A. | 100 Ω |
| B. | 160.3 Ω |
| C. | 50 Ω |
| D. | 65 Ω |
| Answer» C. 50 Ω | |
| 6. |
Determine the impedance of a series LCR-circuit if the reactance of C and L are 250 Ω and 220 Ω respectively and R is 40 Ω. |
| A. | 250 Ω |
| B. | 150 Ω |
| C. | 50 Ω |
| D. | 80 Ω |
| Answer» D. 80 Ω | |