MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
In Newton’s ring experiment, the diameter of the 10th ring changes from 1.40 to 1.23 cm when a liquid is introduced between the lens and glass plate. What is the refractive index of the liquid? |
| A. | 1.05 |
| B. | 1.15 |
| C. | 1.25 |
| D. | 1.35 |
| Answer» D. 1.35 | |
| 2. |
A thin layer of colorless oil is spread over water in a container (μ = 1.4). If the light of wavelength 640 nm is absent in the reflected light, what is the minimum thickness of oil layer? |
| A. | 179.6 nm |
| B. | 198.3 nm |
| C. | 207.6 nm |
| D. | 214.3 nm |
| Answer» E. | |
| 3. |
When a thin plate of refractive index 1.5 is placed in the path of one of interfering beams of Michaelson Interferometer, a shift of 30 fringes is observed. If the thickness of plate is 0.018 mm, the wavelength of the used light is ___________ |
| A. | 4000 Å |
| B. | 5000 Å |
| C. | 6000 Å |
| D. | 7000 Å |
| Answer» D. 7000 Å | |
| 4. |
Which phenomenon is observed in the following figure? |
| A. | Wedge-Shaped film |
| B. | Destructive Interference |
| C. | Refraction |
| D. | Newton’s Rings |
| Answer» E. | |
| 5. |
The interference pattern of soap bubble changes continuously. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
According to stoke’s law, the expression for maxima is: 2μtcosr = ____________ |
| A. | nλ |
| B. | 2nλ |
| C. | (2n + 1) λ/2 |
| D. | (n + 1) λ/2 |
| Answer» D. (n + 1) λ/2 | |
| 7. |
A thin sheet of refractive index 1.5 and thickness 1 cm is placed in the path of light. What is the path difference observed? |
| A. | 0.003 m |
| B. | 0.004 m |
| C. | 0.005 m |
| D. | 0.006 m |
| Answer» D. 0.006 m | |
| 8. |
The shape of the pattern depends on the ____________ |
| A. | Distance between the slits |
| B. | Distance between the slits and the screen |
| C. | Wavelength of light |
| D. | Shape of the slit |
| Answer» E. | |
| 9. |
Interference is observed only when the phase difference between the two waves is zero. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
Zero order fringe can be identified using ____________ |
| A. | White light |
| B. | Yellow light |
| C. | Achromatic light |
| D. | Monochromatic light |
| Answer» B. Yellow light | |
| 11. |
If instead of monochromatic light white light is used for interference of light, what would be the change in the observation? |
| A. | The pattern will not be visible |
| B. | The shape of the pattern will change from hyperbolic to circular |
| C. | Colored fringes 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 | |
| 12. |
The shape of the fringes observed in interference is ____________ |
| A. | Straight |
| B. | Circular |
| C. | Hyperbolic |
| D. | Elliptical |
| Answer» D. Elliptical | |
| 13. |
When Two waves of same amplitude add constructively, the intensity becomes _____________ |
| A. | Double |
| B. | Half |
| C. | Four Times |
| D. | One-Fourth |
| Answer» D. One-Fourth | |
| 14. |
The main principle used in Interference is _____________ |
| A. | Heisenberg’s Uncertainty Principle |
| B. | Superposition Principle |
| C. | Quantum Mechanics |
| D. | Fermi Principle |
| Answer» C. Quantum Mechanics | |
| 15. |
Which of the following does not show any interference pattern? |
| A. | Soap bubble |
| B. | Excessively thin film |
| C. | A thick film |
| D. | Wedge Shaped film |
| Answer» C. A thick film | |