MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
All the given particles have a lifetime of 1 microsecond. Which of them will survive the longest? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 2. |
A particle with a lifetime of 2 X 10-6 s moves through the laboratory with a speed of 0.9 c. It’s lifetime, as measured by an observer in the laboratory, is ___________ |
| A. | 2 X 10-6 s |
| B. | 3.2 X 10-6 s |
| C. | 4.6 X 10-6 s |
| D. | 5.4 X 10-6 s |
| Answer» D. 5.4 X 10-6 s | |
| 3. |
A cube with sides of proper length lo is viewed from a reference frame moving with velocity v, parallel to an edge of the cube. The expression for the volume of the cube for the observer is __________ |
| A. | Lo3 |
| B. | Lo3\(\sqrt{1-\frac{v^2}{c^2}}\) |
| C. | Lo3\((1-\frac{v^2}{c^2})^{3/2}\) |
| D. | Lo3\((1-\frac{v^2}{c^2})\) |
| Answer» B. Lo3\(\sqrt{1-\frac{v^2}{c^2}}\) | |
| 4. |
The length of a rod seems shorter to an observer when it moves in a specific direction. What change would he observe when the direction of rod changes by 180o? |
| A. | The rod becomes even smaller |
| B. | The length of the rod increases |
| C. | The length of the rod remains the same |
| D. | The rod has the length equal to its proper length |
| Answer» D. The rod has the length equal to its proper length | |
| 5. |
If an object reaches the speed of light, it’s length changes to ___________ |
| A. | Infinite |
| B. | Double of the value |
| C. | Half of the value |
| D. | Zero |
| Answer» E. | |