MCQOPTIONS
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MCQOPTIONS
This section includes 5 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 information carrying capacity of laser is enormous due its large _________ |
| A. | Coherence |
| B. | Bandwidth |
| C. | Directionality |
| D. | Intensity |
| Answer» C. Directionality | |
| 2. |
Lasers are used for welding of wires because they can be focused onto a fine spot. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
For an ordinary light source, the coherence time t = 10-10 s. The degree of Monochromaticity for a wavelength of 6000 is ___________ |
| A. | 0.1 X 10<sup>-4</sup> |
| B. | 0.2 X 10<sup>-4</sup> |
| C. | 0.3 X 10<sup>-4</sup> |
| D. | 0.4 X 10<sup>-4</sup> |
| Answer» C. 0.3 X 10<sup>-4</sup> | |
| 4. |
Laser light from a 2mW source of aperture diameter 1.5 cm and wavelength 5000 is focused by a lens of focal length 20 cm. The intensity of the image is __________ |
| A. | 1.57 X 10<sup>6</sup> Wm<sup>-2</sup> |
| B. | 2.57 X 10<sup>6</sup> Wm<sup>-2</sup> |
| C. | 3.57 X 10<sup>6</sup> Wm<sup>-2</sup> |
| D. | 4.57 X 10<sup>6</sup> Wm<sup>-2</sup> |
| Answer» D. 4.57 X 10<sup>6</sup> Wm<sup>-2</sup> | |
| 5. |
Which of the following is not a characteristic of LASERS? |
| A. | Monochromatic |
| B. | Coherent |
| C. | Divergent |
| D. | Intense |
| Answer» D. Intense | |