MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which among the following is the correct expression for finding capacitive reactance for an ac circuit containing capacitor only? |
| A. | Xc = 2πf |
| B. | Xc = \(\frac {1}{2πfC}\) |
| C. | Xc = 2πfC |
| D. | Xc = \(\frac {2πf}{C}\) |
| Answer» C. Xc = 2πfC | |
| 2. |
A 1.50 μF capacitor is connected to a 220 V, 50 Hz source. If the frequency is doubled, what happens to the capacitive reactance? |
| A. | Remains the same |
| B. | Doubled |
| C. | Halved |
| D. | Becomes zero |
| Answer» D. Becomes zero | |
| 3. |
What will be the reactance of a capacitor at 150 Hz, if it has a reactance of 200 Ω at 50 Hz? |
| A. | 67 Ω |
| B. | 40 Ω |
| C. | 150 Ω |
| D. | 60 Ω |
| Answer» B. 40 Ω | |
| 4. |
Calculate the rms value of current in the circuit wherein an 80 μF capacitor is connected to a 100 V, 80 Hz ac supply. |
| A. | 4 A |
| B. | 2 A |
| C. | 7 A |
| D. | 50 A |
| Answer» B. 2 A | |
| 5. |
The capacitive reactance varies directly with the frequency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Give the SI unit of capacitive reactance. |
| A. | Am |
| B. | Ω |
| C. | Ωm |
| D. | A |
| Answer» D. A | |
| 7. |
How will the capacitive reactance be affected if the frequency is doubled? |
| A. | Doubled |
| B. | Insignificant |
| C. | Remains the same |
| D. | Halved |
| Answer» E. | |
| 8. |
What is the capacitive reactance of a 5 μF capacitor when it is a part of a circuit whose frequency is 50 Hz? |
| A. | 636.6 Ω |
| B. | 1636.6 Ω |
| C. | 2636.6 Ω |
| D. | 4636.6 Ω |
| Answer» B. 1636.6 Ω | |
| 9. |
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. |
| A. | 197 mA |
| B. | 1 mA |
| C. | 179 mA |
| D. | 5 mA |
| Answer» C. 179 mA | |
| 10. |
A 1.5 μF capacitor is connected to a 220 V, 50 Hz source. Find the capacitive reactance in the circuit. |
| A. | 2120 Ω |
| B. | 21.2 Ω |
| C. | 212 Ω |
| D. | 2.12 Ω |
| Answer» D. 2.12 Ω | |