MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 8 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. |
By observing the diffraction patter, the two images are said to be just resolved when ________ |
| A. | The central maxima of one image coincide with central maxima of the other |
| B. | The central maxima of one do not coincide with central maxima of the other |
| C. | The central maxima of one image coincides with the first minimum of the other |
| D. | The central maxima of one image do not coincide with the first minimum of other |
| Answer» D. The central maxima of one image do not coincide with the first minimum of other | |
| 2. |
A screen is placed 2m away from the lens to obtain the diffraction pattern in the focal plane of the lens in a single slit diffraction experiment. What will be the slit width if the first minimum lies 5 mm on either side of the central maximum when plane light waves of wavelength 4000 Å are incident on the slit? |
| A. | 0.16 mm |
| B. | 0.26 mm |
| C. | 0.36 mm |
| D. | 0.46 mm |
| Answer» B. 0.26 mm | |
| 3. |
A diffraction pattern is obtained with a straight edge using light of wavelength 5500 Å. The separation between the edge and the source is 15 cm while that between the edge and the eyepiece is 3 m. What is the position of the first maximum? |
| A. | 1.01 cm |
| B. | 2.03 cm |
| C. | 0.46 cm |
| D. | 1.56 cm |
| Answer» B. 2.03 cm | |
| 4. |
What will be the angular separation of the first order fringe from the central maximum, when a light of wavelength 500 nm is diffracted at a slit of width 0.5 mm? |
| A. | 2.1 minute |
| B. | 3.4 minute |
| C. | 4.8 minute |
| D. | 5.6 minute |
| Answer» C. 4.8 minute | |
| 5. |
Sound waves cannot be diffracted. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
If the Fresnel’s distance is a, then what should be the distance of the screen from the slit, d, such that ray optics is no longer valid? |
| A. | d > a |
| B. | d < a |
| C. | d = a |
| D. | No relation between d and a |
| Answer» C. d = a | |
| 7. |
How shall a diffraction pattern change when white light is used instead of a monochromatic light? |
| A. | The pattern will no longer be visible |
| B. | The shape of the pattern will change from hyperbolic to circular |
| C. | The colored pattern will be observed with a white bright fringe at the center |
| D. | The bright and dark fringes will change position |
| Answer» D. The bright and dark fringes will change position | |
| 8. |
What changes are observed in a diffraction pattern if the whole apparatus is immersed in water? |
| A. | The Wavelength of light increases |
| B. | Width of central maximum increases |
| C. | Width of central maximum decreases |
| D. | Frequency of light decreases |
| Answer» D. Frequency of light decreases | |