McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
Effect of diffraction is greatest if waves pass through a gap with width equal to |
| A. | frequency |
| B. | wavelength |
| C. | amplitude |
| D. | wavefront |
| Answer» B. wavelength | |
| 2. |
Visible light has wavelength of |
| A. | 5 × 10-7 m |
| B. | 3 × 108 m |
| C. | 6 × 103 m |
| D. | 4 × 104 m |
| Answer» A. 5 × 10-7 m | |
| 3. |
From double-slit experiment, the quantities to be measured are |
| A. | slit separation |
| B. | fringe separation |
| C. | slit-to-screen distance |
| D. | all of above |
| Answer» D. all of above | |
| 4. |
For destructive interference, the path difference is |
| A. | odd number of half wavelengths |
| B. | even number of half wavelengths |
| C. | whole number of wavelengths |
| D. | even whole number of wavelengths |
| Answer» A. odd number of half wavelengths | |
| 5. |
Constructive interference happens when two waves are |
| A. | out of phase |
| B. | zero amplitude |
| C. | in phase |
| D. | in front |
| Answer» C. in phase | |
| 6. |
Two waves with phase difference 180° have resultant of amplitude |
| A. | one |
| B. | zero |
| C. | same as the single wave |
| D. | doubles the single wave |
| Answer» B. zero | |
| 7. |
If two waves are in phase and have same amplitude then resultant wave has |
| A. | half of amplitude of single wave |
| B. | same amplitude as single wave |
| C. | twice of amplitude of single wave |
| D. | thrice of amplitude of single wave |
| Answer» C. twice of amplitude of single wave | |
| 8. |
For listening radio in cars, external radio aerials are used because |
| A. | radio waves have shorter wavelength |
| B. | radio waves have longer wavelength |
| C. | radio waves cannot pass through window |
| D. | radio waves require a medium to propagate |
| Answer» B. radio waves have longer wavelength | |
| 9. |
When two waves meet, their displacements |
| A. | add up |
| B. | cancel out |
| C. | destruct each other |
| D. | subtract down |
| Answer» A. add up | |
| 10. |
Splitting of white light in to constituent colors is called |
| A. | diffraction |
| B. | refraction |
| C. | reflection |
| D. | dispersion |
| Answer» D. dispersion | |
| 11. |
Grating element is equal to |
| A. | nλ/sinθ |
| B. | nλ |
| C. | sinθ |
| D. | cosθ |
| Answer» A. nλ/sinθ | |
| 12. |
With diffraction grating, the angles are |
| A. | small |
| B. | greater |
| C. | zero |
| D. | close to zero |
| Answer» B. greater | |
| 13. |
Extra distance travelled by one of waves compared with other is called |
| A. | path |
| B. | displacement |
| C. | phase difference |
| D. | path difference |
| Answer» D. path difference | |
| 14. |
Spreading of wave as it passes through a gap or around an edge is called |
| A. | reflection |
| B. | refraction |
| C. | diffraction |
| D. | superposition |
| Answer» C. diffraction | |
| 15. |
Fringes are referred to as |
| A. | minima |
| B. | maxima |
| C. | nodes |
| D. | normal points |
| Answer» B. maxima | |
| 16. |
Principle of superposition can be applied to |
| A. | EM waves |
| B. | sound waves |
| C. | radio waves |
| D. | all of above |
| Answer» D. all of above | |
| 17. |
Coherent sources emit waves that have |
| A. | increasing phase difference |
| B. | decreasing phase difference |
| C. | constant phase difference |
| D. | varying phase difference |
| Answer» C. constant phase difference | |
| 18. |
Interference pattern of light and dark bands on screen is called |
| A. | graphical pattern |
| B. | line spectrum |
| C. | light spectrum |
| D. | fringes |
| Answer» D. fringes | |
| 19. |
Microwaves have wavelength of about |
| A. | 10 cm |
| B. | 20 cm |
| C. | 30 cm |
| D. | 40 cm |
| Answer» A. 10 cm | |
| 20. |
In young double slit experiment, the wavelength of incident beams should be |
| A. | same |
| B. | different |
| C. | zero |
| D. | opposite |
| Answer» A. same | |
| 21. |
Wavelength of an incident light when it is incident normally on a diffraction grating having 3000 lines per centimeter angular separation is 10° is |
| A. | 500 nm |
| B. | 650 nm |
| C. | 580 nm |
| D. | 600 nm |
| Answer» C. 580 nm | |
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