MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The energy levels of which ion/atom/molecule are responsible for lasing action? |
| A. | Al<sup>3+</sup> |
| B. | Cr<sup>3+</sup> |
| C. | Al<sub>2</sub>O<sub>3</sub> |
| D. | Cr<sub>2</sub>O<sub>3</sub> |
| Answer» C. Al<sub>2</sub>O<sub>3</sub> | |
| 2. |
What is the wavelength of the emitted laser in a Ruby laser? |
| A. | 694 nm |
| B. | 650 nm |
| C. | 780 nm |
| D. | 754 nm |
| Answer» B. 650 nm | |
| 3. |
What will be the relative population of atoms in a ruby layer that produces a light beam of wavelength 6943 at 300 K. |
| A. | 5 X 10<sup>-31</sup> |
| B. | 6 X 10<sup>-31</sup> |
| C. | 7 X 10<sup>-31</sup> |
| D. | 8 X 10<sup>-31</sup> |
| Answer» E. | |
| 4. |
For a Ruby laser, the coherence time t = 10-10 s. The degree of Monochromaticity is __________ |
| A. | 0.13 X 10<sup>-4</sup> |
| B. | 0.24 X 10<sup>-4</sup> |
| C. | 0.35 X 10<sup>-4</sup> |
| D. | 0.47 X 10<sup>-4</sup> |
| Answer» B. 0.24 X 10<sup>-4</sup> | |
| 5. |
The laser beam is emitted in the form of __________ |
| A. | Fluctuating radiations |
| B. | Continuous spectrum |
| C. | Pulsed output |
| D. | Exponentially decreasing intensity |
| Answer» D. Exponentially decreasing intensity | |
| 6. |
Which material is used for cooling of the ruby rod for efficient continuous operation? |
| A. | CFC |
| B. | Liquid helium |
| C. | Liquid oxygen |
| D. | Liquid Nitrogen |
| Answer» E. | |
| 7. |
The pumping mechanism used in Ruby rod is __________ |
| A. | Optical Pumping |
| B. | Electrical Excitation |
| C. | Chemical pumping |
| D. | Thermal pumping |
| Answer» B. Electrical Excitation | |
| 8. |
The ends of the ruby rod works as __________ |
| A. | Pumping source |
| B. | Active medium |
| C. | Cavity mirrors |
| D. | Energy levels |
| Answer» D. Energy levels | |
| 9. |
The lifetime of meta-stable state in a Ruby laser is ___________ |
| A. | 10<sup>-8</sup>s |
| B. | 10<sup>-6</sup>s |
| C. | 10<sup>-3</sup>s |
| D. | 10<sup>-2</sup>s |
| Answer» D. 10<sup>-2</sup>s | |
| 10. |
Which of the following is a three-level laser? |
| A. | ND: YAG |
| B. | Ruby |
| C. | He-Ne |
| D. | Semiconductor laser |
| Answer» C. He-Ne | |