McqMate
Chapters
| 1. |
An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of $$$8*10^{6} \: ms ^{-1}$$$ , the radius of the circular path followed by an electron is |
| A. | 3.8 cm |
| B. | 3.7 cm |
| C. | 3.6 cm |
| D. | 3.5 cm |
| Answer» A. 3.8 cm | |
| 2. |
Hall voltage is directly proportional to |
| A. | current |
| B. | electric field |
| C. | magnetic flux density |
| D. | all of above |
| Answer» C. magnetic flux density | |
| 3. |
Force due to magnetic field and velocity is |
| A. | at right angles to each other |
| B. | at acute angles with each other |
| C. | at obtuse angle with each other |
| D. | antiparallel to each other |
| Answer» A. at right angles to each other | |
| 4. |
Force on a moving charge in a uniform magnetic field depends upon |
| A. | magnetic flux density |
| B. | the charge on the particle |
| C. | the speed of particle |
| D. | all of above |
| Answer» D. all of above | |
| 5. |
Electric field strength related to hall voltage is given by |
| A. | VHd |
| B. | VH⁄d |
| C. | VHE |
| D. | Ed |
| Answer» B. VH⁄d | |
| 6. |
Hall probe is made up of |
| A. | metals |
| B. | non metals |
| C. | semiconductor |
| D. | radioactive material |
| Answer» C. semiconductor | |
| 7. |
For an electron, magnitude of force on it is |
| A. | BeV |
| B. | eV |
| C. | Be |
| D. | BV |
| Answer» A. BeV | |
| 8. |
When current is parallel to magnetic fields, force on conductor is |
| A. | zero |
| B. | infinite |
| C. | 2 times |
| D. | same |
| Answer» A. zero | |
| 9. |
Direction of conventional current is |
| A. | direction of neutron flow |
| B. | direction of electron flow |
| C. | direction of flow of positive charge |
| D. | same as that of electric current |
| Answer» C. direction of flow of positive charge | |
| 10. |
According to the equation ‘r =(mv)⁄(Be)’, the faster moving particles |
| A. | move in smaller circle |
| B. | move straight |
| C. | move in bigger circle |
| D. | move randomly |
| Answer» C. move in bigger circle | |
| 11. |
In Hall effect, voltage across probe is known as |
| A. | hall voltage |
| B. | e.m.f |
| C. | potential difference |
| D. | hall potential |
| Answer» A. hall voltage | |
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