This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 12 (24 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Wave front is a imaginary surface, where A) Everywhere phase is equal. B) Phase difference are equal. C) Phase difference is different. D) None of these. Show Answer Correct Answer: A) Everywhere phase is equal. 2. What is the velocity of light in alcohol (n = 1.36)? A) 2.2 x 10$^{8}$ m/s. B) 3 x 10$^{8}$ m/s. C) 4.08 x 10$^{8}$ m/s. D) 1.36 x 10$^{8}$ m/s. Show Answer Correct Answer: A) 2.2 x 10$^{8}$ m/s. 3. In a vacuum a particular light source gives off light waves with a measured wavelength of 2.0 X 10$^{-7}$ m. What is the frequency of the light source? A) 6.67 X 10$^{-15}$ Hz. B) 6.0 X 10$^{-11}$ Hz. C) 1.5 X 10$^{15}$ Hz. D) Not enough information. Show Answer Correct Answer: C) 1.5 X 10$^{15}$ Hz. 4. Bright spots on the interference pattern are visible because of: A) Destructive Interference of Light. B) Constructive Interference of Light. C) Polarization of Light. D) Light is always bright. Show Answer Correct Answer: B) Constructive Interference of Light. 5. The phenomenon of diffraction can be understood using A) Fraunhofer. B) Uncertainty principle. C) Fresnel. D) Huygens principle. Show Answer Correct Answer: D) Huygens principle. 6. What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 A$^{o}$ is used and slit width is 12 x 10$^{-5}$ cm A) 2 rad. B) 3 rad. C) 1 rad. D) 8 rad. Show Answer Correct Answer: C) 1 rad. 7. The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of A) 10$^{6}$ rad. B) 10$^{-2}$ rad. C) 10$^{-4}$ rad. D) 10$^{-6}$ rad. Show Answer Correct Answer: D) 10$^{-6}$ rad. 8. Yellow light is used in single slit diffraction experiment with slit width of 0.6 mm . If yellow light is replaced by X-rays, then the observed pattern will reveal: A) That the central maximum is narrower. B) More number of fringes. C) Less number of fringes. D) No diffraction pattern. Show Answer Correct Answer: D) No diffraction pattern. 9. When 2nd secondary maxima is obtained in case of single slit diffraction pattern, the angular position is given by A) $\lambda$. B) $\lambda$/2. C) 3$\lambda$/2. D) 5$\lambda$/2. Show Answer Correct Answer: D) 5$\lambda$/2. 10. When a compact disc is illuminated by a source of white light, colored lines are observed . This is due to A) Dispersion. B) Diffraction. C) Interference. D) Refraction. Show Answer Correct Answer: B) Diffraction. 11. If a wave from one slit of a Young's double-slit experiment set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point? A) Dark fringe. B) Bright fringe. C) Multi-colored fringe. D) Gray fringe, neither bright nor dark. Show Answer Correct Answer: B) Bright fringe. 12. Diffraction and interference of light suggest ..... A) Nature of light is electro-magnetic. B) Wave nature. C) Nature is quantum. D) Nature of light is transverse. Show Answer Correct Answer: B) Wave nature. 13. To demonstrate the phenomenon of interference, we require two sources A) Of the same frequency and having a constant phase difference. B) Of nearly the same frequency. C) Of the same frequency. D) Of different wavelengths. Show Answer Correct Answer: A) Of the same frequency and having a constant phase difference. 14. If the distance between a point source and screen is doubled, then intensity of light on the screen will become ..... A) Four times. B) Double. C) Half. D) One-fourth. Show Answer Correct Answer: D) One-fourth. 15. In diffraction from single slit, the angular width of central maxima does not depend on A) $\lambda$ of light used. B) Width of slit. C) Distance of slits from screen. D) Ratio of the $\lambda$ and slit width. Show Answer Correct Answer: C) Distance of slits from screen. 16. The angular width of the central maxima of the diffraction pattern remains the same A) No changes. B) Diffraction pattern becomes narrower. C) Diffraction pattern becomes broader. D) Diffraction pattern disappears. Show Answer Correct Answer: B) Diffraction pattern becomes narrower. 17. LCD uses the phenomenon of A) Dispersion. B) Diffraction. C) Interference. D) Polarization. Show Answer Correct Answer: D) Polarization. 18. The contrast in the fringes in any interference pattern depends on A) Fringe width. B) Wavelength. C) Intensity ratio of sources. D) Distance between sources. Show Answer Correct Answer: C) Intensity ratio of sources. 19. Which of the following conditions best distinguishes Fresnel diffraction from Fraunhofer diffraction? A) Type of wavefronts involved. B) Shape of aperture. C) Frequency of light used. D) Angle of incidence. Show Answer Correct Answer: A) Type of wavefronts involved. 20. In Young's double slit experiment, a thin uniform sheet of glass is kept in front of the two slits, parallel to the screen having the slits. The resulting interference pattern will satisfy: A) The interference pattern will remain unchanged. B) The fringe width will decrease. C) The fringe width will increase. D) The fringes will shift. Show Answer Correct Answer: D) The fringes will shift. 21. In interference pattern A) We get the fringes of same intensity and same width. B) We get the fringes of same intensity but different width. C) We get the fringes of different intensity but same width. D) We get the fringes of different intensities and different widths. Show Answer Correct Answer: A) We get the fringes of same intensity and same width. 22. What is meant by monochromatic light? A) A light source with one wavelength only. B) A light source with one speed only. C) A light source with only white light. D) A light source that is coherent. Show Answer Correct Answer: A) A light source with one wavelength only. 23. In the phenomena of Diffraction of light when the violet light is used in the experiment is used instead of red light then, A) Fringe width increases. B) No change in fridge width. C) Fringe width decreases. D) Colour pattern is formed. Show Answer Correct Answer: C) Fringe width decreases. 24. By a monochromatic wave, we mean A) A single ray. B) A single ray of a single colour. C) Wave having a single wavelength. D) Many rays of a single colour. Show Answer Correct Answer: C) Wave having a single wavelength. ← PreviousRelated QuizzesClass 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 1Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 2Class 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books