MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Three positive charges are kept at the vertices of an equilateral triangle. We can make the potential energy of the system zero by adjusting the amount of charges. This statement is ______ |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Three charges q, Q and q are placed in a straight line maintaining equal distance from each other. What should be the ratio ( frac {q}{Q} ) so that the net electric potential of the system is zero? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 3. |
Electric field intensity and electric potential at a certain distance from a point charge is 32 N/C and 16 J/C. What is the distance from the charge? |
| A. | 50 m |
| B. | 0.5 m |
| C. | 10 m |
| D. | 7 m |
| Answer» C. 10 m | |
| 4. |
Two plates are kept at a distance of 0.1m and their potential difference is 20V. An electron is kept at rest on the surface of the plate with lower potential. What will be the velocity of the electron when it strikes another plate? |
| A. | 1.87*10<sup>6</sup> m/s |
| B. | 2.65*10<sup>6</sup> m/s |
| C. | 7.02*10<sup>12</sup> m/s |
| D. | 32*10<sup>-19</sup> m/s |
| Answer» C. 7.02*10<sup>12</sup> m/s | |
| 5. |
A small charge q is rotated in a complete circular path of radius r surrounding another charge Q. The work done in this process is _________ |
| A. | Zero |
| B. | ( frac {qQ}{4 pi varepsilon r} ) |
| C. | ( frac {q}{4 pi varepsilon ( pi r)} ) |
| D. | ( frac {q}{4 pi varepsilon (2 pi r)} ) |
| Answer» B. ( frac {qQ}{4 pi varepsilon r} ) | |
| 6. |
Two point charges 10C and -10C are placed at a certain distance. What is the electric potential of their midpoint? |
| A. | Some positive value |
| B. | Some negative value |
| C. | Zero |
| D. | Depends on medium |
| Answer» D. Depends on medium | |
| 7. |
What is the amount of work done to bring a charge of 4*10-3C charge from infinity to a point whose electric potential is 2*102V? |
| A. | 0.8J |
| B. | -0.8J |
| C. | 1.6J |
| D. | -0.4J |
| Answer» B. -0.8J | |
| 8. |
Calculate electric potential due to a point charge of 10C at a distance of 8cm away from the charge. |
| A. | 1.125*10<sup>13</sup>V |
| B. | 1.125*10<sup>12</sup>V |
| C. | 2.25*10<sup>13</sup>V |
| D. | 0.62*10<sup>13</sup>V |
| Answer» C. 2.25*10<sup>13</sup>V | |
| 9. |
Electric potential due to a point charge q at a distance r from the point is _______ (in the air). |
| A. | ( frac {q}{r} ) |
| B. | q*r |
| C. | ( frac {q}{r^2} ) |
| D. | ( frac {-q}{r} ) |
| Answer» B. q*r | |