This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following phenomena can explain quantum nature of light ..... A) Photoelectric effect. B) Interference. C) Diffraction. D) Polarisation. Show Answer Correct Answer: A) Photoelectric effect. 2. In the context of wave optics, what does 'path difference' refer to? A) The difference in phase of two waves. B) The difference in amplitude of two waves. C) The difference in distance traveled by two waves. D) The difference in frequency of two waves. Show Answer Correct Answer: C) The difference in distance traveled by two waves. 3. In Fresnel diffraction, the observed pattern changes if: A) The slit width remains the same. B) The wavelength remains the same. C) The screen distance changes. D) The speed of light changes. Show Answer Correct Answer: C) The screen distance changes. 4. Light in a vacuum has wavelength, $\lambda$. What is the wavelength of light upon entering a material with an index of refraction, n? A) $n\lambda$. B) $\frac{n}{\lambda}$. C) $\frac{n}{c\lambda}$. D) $\frac{\lambda}{n}$. Show Answer Correct Answer: D) $\frac{\lambda}{n}$. 5. The ..... is equal to the ratio of the speed of light in vacuum (c) to the speed of light in the medium (v). A) Wavefront. B) Permittivity. C) Refractive index. D) Permeability. Show Answer Correct Answer: C) Refractive index. 6. The maximum number of possible interference maxima for the slit separation equal to twice the wavelength is in YDSE A) Infinity. B) Five. C) Three. D) Zero. Show Answer Correct Answer: B) Five. 7. A diffraction grating with 10, 000 lines per centimeter will exhibit the first-order maximum for light of wavelength 510 nm at what angle? A) 0.51$^{o}$. B) 0.62$^{o}$. C) 15.3$^{o}$. D) 31$^{o}$. Show Answer Correct Answer: D) 31$^{o}$. 8. The shape of waverfront for a light emerging out of a convex lens when a point source is placed at its focus A) Plane wavefront. B) Soherical wavefront. C) All the above. D) None of the above. Show Answer Correct Answer: A) Plane wavefront. 9. The points of the wave front of light are the sources of smaller waves called wavelets. A) Huygen. B) Hubble. C) Grimaldi. D) Mahathir. Show Answer Correct Answer: A) Huygen. 10. As per Huygens principle, wavelets originating on a wavefront grow with A) Slow speed. B) Same speed. C) More speed. D) None of these. Show Answer Correct Answer: B) Same speed. 11. Diffraction is waves bending because of A) Edges of a slit or thin object. B) Speed of wave changes. C) Dark matter. D) Gravity. Show Answer Correct Answer: A) Edges of a slit or thin object. 12. The frequency of a light wave in a material is 2 x 10$^{14}$ Hz and wavelengthis 5000A$^{o}$. The refractive index of material is A) 1.50. B) 3.00. C) 1.33. D) 1.40. Show Answer Correct Answer: B) 3.00. 13. According to Huygens' principle, light is a form of A) Particle. B) Rays. C) Wave. D) Radiation. Show Answer Correct Answer: C) Wave. 14. . In a Young's double slit experiment, two slits of equal width are arranged symmetrically w.r.to the sources. The intensity of the central bright fringe is I. If one of the slits is closed, the intensity at the Centre of the screen will be A) I. B) I/4. C) I/2. D) 2I. Show Answer Correct Answer: B) I/4. 15. A plane wavefront passes through a small circular aperture. What will be the shape of the wavefront emerging on the other side? A) Plane. B) Cylindrical. C) Spherical. D) Elliptical. Show Answer Correct Answer: C) Spherical. 16. What do you mean by the Rayleigh criterion? A) When the central maximum of one source coincides with the first minimum of the other. B) When the central maximum of one source overlap with the central maximum of the other. C) When the central maximum of one source overlap with the first minimum of the other. D) None of the above. Show Answer Correct Answer: A) When the central maximum of one source coincides with the first minimum of the other. 17. Which phenomenon is observed when light passes through a narrow slit and spreads out? A) Reflection. B) Refraction. C) Diffraction. D) Interference. Show Answer Correct Answer: C) Diffraction. 18. According to Huygens' principle: A) Each point on wavefront is a source of secondary wavelet. B) Each wavelet is a source of new wavefront. C) The speed of secondary wavelets is lesser than the speed of primary wavelets. D) The new wavefront can be taken in forward as well as in backward direction. Show Answer Correct Answer: A) Each point on wavefront is a source of secondary wavelet. 19. According to Huygens principle of secondary wavelets, each particle at a wave front A) Is an electron. B) Behaves as a photon. C) Represents the direction of the motion of wave front. D) Behaves as a new light source. Show Answer Correct Answer: D) Behaves as a new light source. 20. A wave front is an imaginary surface where A) All particles lying on this vibrate in opposite phase. B) Some particles in same phase and some in opposite phase. C) All particles lying on this vibrate in same phase. D) None of these. Show Answer Correct Answer: C) All particles lying on this vibrate in same phase. 21. In YDSE the ratio of maximum to minimum intensities of the fringe system is 4:1. The amplitudes of the coherent sources are in the ratio A) 4:1. B) 3:1. C) 2:1. D) 1:1. Show Answer Correct Answer: B) 3:1. 22. Reciprocal of the limit ofresolution is called ..... A) Polarization. B) Resolving power. C) Angle of resolution. D) Dispersive power. Show Answer Correct Answer: B) Resolving power. 23. Which of the following real-world phenomena demonstrates the superposition of sound waves? A) A rainbow forming after rain. B) Laser beam coherence. C) Beats heard when two tuning forks are struck. D) Bending of light in water. Show Answer Correct Answer: C) Beats heard when two tuning forks are struck. 24. Which of the following phenomenon is not explained by Huygen's wave theory? A) Diffraction. B) Interference. C) Photoelectric effect. D) None of these. Show Answer Correct Answer: C) Photoelectric effect. 25. Consider sunlight incident on a slit of width 104 A. The image seen through the slit shall A) Be a fine sharp slit white in colour at the center. B) A bright slit white at the center diffusing to zero intensities atthe edges. C) A bright slit white at the center diffusing to regions of differentcolours. D) Only be a diffused slit white in colour. Show Answer Correct Answer: A) Be a fine sharp slit white in colour at the center. ← PreviousNext →Related QuizzesClass 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 1Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 3Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 4Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 5Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 6Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 7Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 8Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 9Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 10Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books