MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
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 | |
| 2. |
Which graph is shown in the figure? |
| A. | Amplitude variation with the number of exposed zones |
| B. | Intensity variation with the number of exposed zones |
| C. | Frequency variation with the number of exposed zones |
| D. | Phase variation with the number of exposed zones |
| Answer» C. Frequency variation with the number of exposed zones | |
| 3. |
Find the missing order for a double-slit Fraunhofer Diffraction pattern if the slit widths are 0.2 mm separated by 0.6 mm. |
| A. | 1st, 5th, 9th, …. |
| B. | 2nd, 6th, 10th, … |
| C. | 3rd, 7th, 11th, …. |
| D. | 4th, 8th, 12th, … |
| Answer» E. | |
| 4. |
The zone plate behaves like a ___________ |
| A. | Concave Lens with multiple foci |
| B. | Convex Lens with multiple foci |
| C. | Convex Lens with single foci |
| D. | Concave Lens with single foci |
| Answer» C. Convex Lens with single foci | |
| 5. |
Light of 6000 Å is incident on a circular hole and is received on a screen 50 cm away. What is the radius of the hole, if the intensity of light on the screen is 4 times the intensity without the hole? |
| A. | 0.025 cm |
| B. | 0.047 cm |
| C. | 0.054 cm |
| D. | 0.089 cm |
| Answer» D. 0.089 cm | |
| 6. |
Light of 5000 Å is incident on a circular hole of radius 1 cm. How many half period zones are contained in the circle if the screen is placed at a distance of 1 m? |
| A. | 20 |
| B. | 200 |
| C. | 2000 |
| D. | 20000 |
| Answer» E. | |
| 7. |
In Double Slit Fraunhofer Diffraction, some orders of interference pattern are missing. It is called ____________ |
| A. | Missing Spectra |
| B. | Absent Spectra |
| C. | End Spectra |
| D. | Emission Spectra |
| Answer» C. End Spectra | |
| 8. |
The radius of the half period zone is proportional to __________ |
| A. | The wavelength of light |
| B. | The square root of the frequency of light |
| C. | The square root of the wavelength light |
| D. | The frequency of light |
| Answer» D. The frequency of light | |
| 9. |
In Fresnel Diffraction, the incident wavefront is _________ |
| A. | Hyperbolic |
| B. | Linear |
| C. | Spherical |
| D. | Elliptical |
| Answer» D. Elliptical | |
| 10. |
In Fresnel diffraction, the relative phase difference between the curved wavefront is ___________ |
| A. | Constant |
| B. | Zero |
| C. | Linearly increasing |
| D. | Non-constant |
| Answer» E. | |
| 11. |
If the separation between the two slits in Double Slit Fraunhofer Diffraction is changed, what change will be observed in the diffraction pattern? |
| A. | The fringe length will increase |
| B. | The fringe length will decrease |
| C. | Fringes will be colored |
| D. | No change |
| Answer» E. | |
| 12. |
How many lenses are used in Fraunhofer Diffraction? |
| A. | Two Convex lenses |
| B. | Two Concave lenses |
| C. | One Convex lens |
| D. | No lens used |
| Answer» E. | |