MCQOPTIONS
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MCQOPTIONS
This section includes 14 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 following graph is pictorial representation of _________ |
| A. | Spontaneous emission |
| B. | Spontaneous Absorption |
| C. | Stimulated emission |
| D. | Stimulated Absorption |
| Answer» D. Stimulated Absorption | |
| 2. |
What is the region enclosed by the optical cavity called? |
| A. | Optical Region |
| B. | Optical System |
| C. | Optical box |
| D. | Optical Resonator |
| Answer» E. | |
| 3. |
Which characteristic of LASER allows it to be used in holography? |
| A. | Coherency |
| B. | Directionality |
| C. | Intensity |
| D. | Monochromaticity |
| Answer» B. Directionality | |
| 4. |
The information carrying capacity of laser is enormous due its large _________ |
| A. | Coherence |
| B. | Bandwidth |
| C. | Directionality |
| D. | Intensity |
| Answer» C. Directionality | |
| 5. |
Where is ND: YAG most commonly used? |
| A. | Cosmetic Surgery |
| B. | Welding |
| C. | Photography |
| D. | Optical Communications |
| Answer» B. Welding | |
| 6. |
Lasers are used for welding of wires because they can be focused onto a fine spot. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
For an ordinary light source, the coherence time t = 10-10 s. The degree of Monochromaticity for a wavelength of 6000 Å is ___________ |
| A. | 0.1 X 10-4 |
| B. | 0.2 X 10-4 |
| C. | 0.3 X 10-4 |
| D. | 0.4 X 10-4 |
| Answer» C. 0.3 X 10-4 | |
| 8. |
Laser light from a 2mW source of aperture diameter 1.5 cm and wavelength 5000 Å is focused by a lens of focal length 20 cm. The intensity of the image is __________ |
| A. | 1.57 X 106 Wm-2 |
| B. | 2.57 X 106 Wm-2 |
| C. | 3.57 X 106 Wm-2 |
| D. | 4.57 X 106 Wm-2 |
| Answer» D. 4.57 X 106 Wm-2 | |
| 9. |
The output of a laser has pulse duration of 30 ms and average output power of 1 W per pulse. How much energy is released per pulse if wavelength is 6600 Å? |
| A. | 0.001 J |
| B. | 0.002 J |
| C. | 0.003 J |
| D. | 0.004 J |
| Answer» D. 0.004 J | |
| 10. |
Laser is used in LIDAR for what purpose? |
| A. | High-Speed Photography |
| B. | Range finder |
| C. | Optical Carrier signal |
| D. | Drilling |
| Answer» C. Optical Carrier signal | |
| 11. |
Which of the following is not a characteristic of LASERS? |
| A. | Monochromatic |
| B. | Coherent |
| C. | Divergent |
| D. | Intense |
| Answer» D. Intense | |
| 12. |
Phonons are __________ |
| A. | Quanta of energy |
| B. | Quanta of light waves |
| C. | Quanta of sound waves |
| D. | Quanta of heat |
| Answer» D. Quanta of heat | |
| 13. |
In Stimulated Absorption, what is the lifetime of atoms ground state? |
| A. | 1 second |
| B. | 1 minute |
| C. | 1 hour |
| D. | Infinity |
| Answer» E. | |
| 14. |
What is the full form of LASER? |
| A. | Light Absorbent and Stimulated Emission of Radiations |
| B. | Light Absorbing Solar Energy Resource |
| C. | Light Amplification by Stimulated Emission of Radiations |
| D. | Light Amplification of Singular Emission of Radiations |
| Answer» D. Light Amplification of Singular Emission of Radiations | |