This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What happens, if the monochromatic light used in Young's double slit experiment is replaced by white light? A) No fringes are observed. B) All bright fringes become while. C) All bright fringes have colour between violet and red. D) Only the central fringe is white and all other fringes are coloured. Show Answer Correct Answer: D) Only the central fringe is white and all other fringes are coloured. 2. In double refraction, two refracted rays are produced, called as O-ray and E-ray. Which of the following statements is TRUE A) Only O-ray is polarised. B) Only E-ray is polarised. C) Both O-ray and E-ray are polarised. D) Neither E-ray nor O-ray are polarised. Show Answer Correct Answer: C) Both O-ray and E-ray are polarised. 3. Phenomenon that establishes transvers nature of light is A) Photoelectric effect. B) Interference. C) Diffraction. D) Polarization. Show Answer Correct Answer: D) Polarization. 4. Which of the following does not affect the interference pattern in a Michelson interferometer? A) Wavelength of light. B) Mirror displacement. C) Refractive index of medium in one arm. D) Size of the beam splitter. Show Answer Correct Answer: D) Size of the beam splitter. 5. Which of the following sources is most coherent? A) Sunlight. B) Incandescent bulb. C) LED. D) Laser. Show Answer Correct Answer: D) Laser. 6. Sound wave do not exhibit ..... A) Interference. B) Diffraction. C) Polarisation. D) Reflection. Show Answer Correct Answer: C) Polarisation. 7. In Young's double-slit experiment, the intensity is I at a point, where the path difference is $\lambda$/6 ($\lambda$-wavelength of light used). If I$_{0}$ denotes the maximum intensity then I/I$_{0}$ is equal to A) $\sqrt{\frac{3}{2}}$. B) 1/2. C) 3/4. D) $\frac{1}{\sqrt{2}}$. Show Answer Correct Answer: C) 3/4. 8. Two coherent sources of light can be obtained from A) Two different lamps. B) Two different lamps of different colours. C) Two different lamps of the same colour. D) None of these. Show Answer Correct Answer: D) None of these. 9. In Fraunhofer diffraction from a single slit, increasing the slit width will: A) Increase the fringe width. B) Decrease the fringe width. C) Eliminate diffraction entirely. D) Cause fringes to shift randomly. Show Answer Correct Answer: B) Decrease the fringe width. 10. The shape of wave front from a distant souce of light will be A) Spherical. B) Plane. C) Cylindrical. D) Elliptical. Show Answer Correct Answer: B) Plane. 11. Which type of diffraction typically shows fewer but sharper fringes? A) Fresnel diffraction. B) Fraunhofer diffraction. C) Both show same pattern. D) Neither. Show Answer Correct Answer: B) Fraunhofer diffraction. 12. Coherent sources are those sources for which A) Phase difference remain constant. B) Frequency remains constant. C) Both phase difference and frequency remains constant. D) None of these. Show Answer Correct Answer: C) Both phase difference and frequency remains constant. 13. A point source of light is placed in front of a plane mirror. A) All the reflected rays meet at a point when produced backward. B) Only the reflected rays close to the normal meet at a point when produced backward. C) Only the reflected rays making a small angle with the mirror, meet at a point when produced backward. D) Light of different colours make different images. Show Answer Correct Answer: A) All the reflected rays meet at a point when produced backward. 14. Doubly refracting calcite crystal is placed over an ink dot. On seeing through the crystal, one observes. A) Both dots rotating about a comman axis. B) Two stationary dots. C) One dot rotating about the other. D) A single dot. Show Answer Correct Answer: C) One dot rotating about the other. 15. Figure 10.2 shows a standard two slit arrangement with slits $S_{1, }S_{2, }P_1P_2$ $P_2$ $P_2$ $S_{3, }S_4$ A) There would be no interference pattern on thesecond screen but it would be lighted. B) The second screen would be totally dark. C) There would be a single bright point on the second screen. D) There would be a regular two slit pattern on the second screen. Show Answer Correct Answer: D) There would be a regular two slit pattern on the second screen. 16. The phenomenon of interference is based on A) Conservation of momentum. B) Conservation of energy. C) Conservation of momentum and energy. D) Quantum nature of light. Show Answer Correct Answer: B) Conservation of energy. 17. Which of the following devices uses the wave nature of light to separate different wavelengths? A) Convex lens. B) Concave mirror. C) Diffraction grating. D) Optical fiber. Show Answer Correct Answer: C) Diffraction grating. 18. Electromagnetic waves have A) Electric field only. B) Magnetic field only. C) Both electric and magnetic field. D) None of the above. Show Answer Correct Answer: C) Both electric and magnetic field. 19. In a Young's double-slit interference apparatus, the distance from the slits to the screen is doubled. The distance between adjacent light and dark fringes changes by a factor of A) 1/4. B) 1/2. C) 2. D) 4. Show Answer Correct Answer: D) 4. 20. Secondary wave principle given by A) Newton. B) Brewster. C) Melus. D) Huygen. Show Answer Correct Answer: D) Huygen. 21. The substance the wave travels through (solid, liquid, gas) A) Seismic. B) Medium. C) Trough. D) Crest. Show Answer Correct Answer: B) Medium. 22. For Young's double slit interference distance of $n^{th}$ A) $\frac{n\lambda D}{d}$. B) $\frac{n\lambda d}{D}$. C) $\left(n+\frac{1}{2}\right)\\frac{\lambda D}{d}$. D) $\left(n+\frac{1}{2}\right)\\frac{\lambda d}{D}$. Show Answer Correct Answer: A) $\frac{n\lambda D}{d}$. 23. The ratio of the amplitude of the two sources producing interference 3:5, the ratio of intensities at maxima and minima is A) 25:6. B) 5:3. C) 16:1. D) 25:9. Show Answer Correct Answer: C) 16:1. 24. A diffraction grating with 2400 lines per centimetre is used to produce a diffraction pattern that is recorded by a detector. The first-order fringe is 8.94 cm from central fringe. If the distance between the grating and the detector is 0.625 m, what is the wavelength of the electromagnetic wave used? A) 295 nm. B) 590 nm. C) 1180 nm. D) 1190 nm. Show Answer Correct Answer: B) 590 nm. 25. When exposed to sunlight, thin films of oil on water often exhibit brilliant colors due to the phenomenon of A) Dispersion. B) Polarisation. C) Diffraction. D) Interference. Show Answer Correct Answer: D) Interference. ← PreviousNext →Related 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 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