MCQOPTIONS
Saved Bookmarks
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. |
In a cyclotron, a magnetic induction of 1.4 T is used to accelerate protons. How rapidly should the electric field between the dees be reversed? |
| A. | 5.2 10<sup>-8</sup> s |
| B. | 2.34 10<sup>-8</sup> s |
| C. | 792.25 10<sup>-8</sup> s |
| D. | 46.25 10<sup>-8</sup> s |
| Answer» C. 792.25 10<sup>-8</sup> s | |
| 2. |
What should be the minimum magnitude of the magnetic field that must be produced at the equator of earth so that a proton may go round the earth with a speed of 1 107 ms-1? Earth s radius is 6.4 106 m. |
| A. | 16.63 10<sup>-8</sup> T |
| B. | 91.63 10<sup>-8</sup> T |
| C. | 1.63 10<sup>-8</sup> T |
| D. | 761.63 10<sup>-8</sup> T |
| Answer» D. 761.63 10<sup>-8</sup> T | |
| 3. |
Alpha particles of mass 6.68 10-27 Kg and charge 3.2 10-19 C is accelerated in a cyclotron in which a magnetic field of 1.25 T is applied perpendicular to the dees. How rapidly should the electric field between the dees be reversed? |
| A. | 5.25 10<sup>-8</sup> s |
| B. | 955.25 10<sup>-8</sup> s |
| C. | 55.25 10<sup>-8</sup> s |
| D. | 575.25 10<sup>-8</sup> s |
| Answer» B. 955.25 10<sup>-8</sup> s | |
| 4. |
The frequency of revolution of a charged particle in a cyclotron does not depend on X . Identify X. |
| A. | Magnetic field |
| B. | Speed of the particle |
| C. | Mass of the particle |
| D. | Charge on the particle |
| Answer» C. Mass of the particle | |
| 5. |
Electrons are accelerated in a cyclotron. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
A cyclotron has an oscillatory frequency of 12 MHz and a dee radius of 50 cm. Calculate the magnetic field required to accelerate deuterons of mass 3.3 10-27 Kg and charge 1.6 10-19 C. |
| A. | 25.6 T |
| B. | 75.5 T |
| C. | 1.56 T |
| D. | 7.56 T |
| Answer» D. 7.56 T | |
| 7. |
If an electron entering at a magnetic field of 2 10-2 T has a velocity of 3 107 ms-1 and describes a circle of radius 8 10-3 m, then find the value of ( frac {e}{m} ) of the electron. |
| A. | 1.567 10<sup>11</sup> C/Kg |
| B. | 190 10<sup>11</sup> C/Kg |
| C. | 18 10<sup>11</sup> C/Kg |
| D. | 1.875 10<sup>11</sup> C/Kg |
| Answer» E. | |
| 8. |
Which of the following particles cannot be accelerated using a cyclotron? |
| A. | Neutron |
| B. | -particle |
| C. | Deuteron |
| D. | Proton |
| Answer» B. -particle | |
| 9. |
A chamber is maintained at a uniform magnetic field of 5 10-3 T. An electron with a speed of 5 107 ms-1 enters the chamber in a direction normal to the field. Calculate the radius of the path. |
| A. | 15.7 cm |
| B. | 5.7 cm |
| C. | 25.7 cm |
| D. | 75.7 cm |
| Answer» C. 25.7 cm | |
| 10. |
Calculate the speed of an electron if it travels in a circular path of radius 50 cm in a magnetic field of 5 10-3 T. |
| A. | 440 10<sup>7</sup> m/s |
| B. | 4 10<sup>7</sup> m/s |
| C. | 44 10<sup>7</sup> m/s |
| D. | 0.4 10<sup>7</sup> m/s |
| Answer» D. 0.4 10<sup>7</sup> m/s | |