This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part Ii > 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 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Two slits in YDSE have widths in the ratio 1:25. Then the ratio of maximum and minimum in the interference pattern will be A) 9:4. B) 4:9. C) 5:1. D) 1;5. Show Answer Correct Answer: A) 9:4. 2. In single slit diffraction experiment, on moving sreen away from the slit angular width of fringes would A) Decrease. B) Increase. C) No change. D) None of these. Show Answer Correct Answer: C) No change. 3. Light of wavelength 589.3nm is incident normally on the slit of width 0.1mm. What will be the angular width of the central diffraction maximum at a distance of 1m from the slit A) 0.68$^{o}$. B) 1.02$^{o}$. C) 0.34$^{o}$. D) None of these. Show Answer Correct Answer: A) 0.68$^{o}$. 4. ..... principle says that each point of the wavefront is the source of a secondary disturbance and the wavelets emanating from these points spread out in all directions with the speed of the wave. A) Hertz. B) Maxwell. C) Huygens. D) Rayleigh. Show Answer Correct Answer: C) Huygens. 5. The human eye can readily detect wavelengths from about 400 nm to 700 nm. If white light illuminates a diffraction grating having 750 lines/mm, over what range of angles does the visible m=1 spectrum extend? A) 17-32 degrees. B) 1-10 degrees. C) 10-12 degrees. D) 43-46 degrees. Show Answer Correct Answer: A) 17-32 degrees. 6. Light propagates rectilinearly, due to A) Wavelengths. B) Wave nature. C) Velocity. D) Frequency. Show Answer Correct Answer: B) Wave nature. 7. The wave nature of light can be experimentally confirmed by observing: A) Interference patterns. B) Straight-line shadows. C) Increase in temperature on absorption. D) Photoemission of electrons. Show Answer Correct Answer: A) Interference patterns. 8. The Rayleigh criterion for resolving power for a circular aperture is $\theta=1.22\\frac{\lambda}{D}$ $\times10^{12}$ $\times10^9$ A) $4\times10^{-5}m$. B) 18 m. C) 0.018 m. D) $4\times10^{-4}m$. Show Answer Correct Answer: B) 18 m. 9. Which of the following is essential for sustained interference between two waves? A) Same amplitude. B) Same frequency and constant phase difference. C) Same wavelength only. D) Opposite polarizations. Show Answer Correct Answer: B) Same frequency and constant phase difference. 10. A slit of width 0.1 mm is illuminated by a light of wavelength 5000 A$^{0}$ . The angle of diffraction for third minimum is A) 3.5 x 10$^{-3}$ rad. B) 15 x 10$^{-3}$ rad. C) 35 x 10$^{-3}$ rad. D) 1.5 x 10$^{-3}$ rad. Show Answer Correct Answer: B) 15 x 10$^{-3}$ rad. 11. The characteristics of wave which does not change after refraction is A) Wavelength. B) Velocity. C) Frequency. D) None. Show Answer Correct Answer: C) Frequency. 12. A diffraction grating that has 4000 lines per centimetres is illuminated at normal incidence with white light ( wavelength range of 400 nm to 700 nm). How many orders of spectra can one observe in the transmitted light? A) 5. B) 2. C) 4. D) 3. Show Answer Correct Answer: D) 3. 13. In YDSE fringe width was found to be 0.4 mm . If whole apparatus is immersed in water of $\mu$= 4/3, new fringe width in mm is A) 0.30. B) 0.25. C) 0.53. D) 0.40. Show Answer Correct Answer: A) 0.30. 14. What is the highest order maximum for wavelength 450 nm that can be obtained with a grating with 600 lines per millimeter? A) 6. B) 3. C) 7. D) 4. Show Answer Correct Answer: B) 3. 15. Resolving power of telescope can be increased by increasing A) The wavelength. B) The diameter of objective. C) The diameter of eyepiece. D) The focal length of eyepiece. Show Answer Correct Answer: B) The diameter of objective. 16. Which of the following phenomenon proves that light is a transverse wave? A) Polarization. B) Interference. C) Diffraction. D) Reflection. Show Answer Correct Answer: A) Polarization. 17. The direction of wave front of a wave with the difference of propagation of wave is A) Parallel. B) Perpendicular. C) Opposite. D) At angle. Show Answer Correct Answer: B) Perpendicular. 18. In stationary wave, antinodes are the points where there is ..... A) Minimum displacement and minimum pressure change. B) Maximum displacement and minimum pressure change. C) Minimum displacement and maximum pressure change. D) Maximum displacement and maximum pressure change. Show Answer Correct Answer: C) Minimum displacement and maximum pressure change. 19. In the context of wave optics, what does the term 'coherence' refer to? A) Same frequency of waves. B) Ability to reflect light. C) Same amplitude of waves. D) Constant phase relationship between waves. Show Answer Correct Answer: D) Constant phase relationship between waves. 20. In a double-slit experiment, if one of the slits is covered, what happens to the interference pattern? A) It becomes brighter. B) It becomes a single band. C) It disappears completely. D) It remains unchanged. Show Answer Correct Answer: C) It disappears completely. 21. The resolving power of a grating decreases with the increase in the number of lines on grating. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 22. Huygen's conception of secondary waves ..... A) Allow us to find the focal length of a thick lens. B) Is a geometrical method to find a wavefront. C) Is used to determine the velocity of light. D) Is used to explain polarization. Show Answer Correct Answer: B) Is a geometrical method to find a wavefront. 23. Superposition of family of waves originating from a slit forms ..... pattern A) Polarization. B) Interference. C) Diffraction. D) Dispersion. Show Answer Correct Answer: C) Diffraction. 24. Coherent sources have A) Same frequency. B) Constant or zero phase difference. C) Both a and b. D) None of these. Show Answer Correct Answer: C) Both a and b. 25. Which phenomenon proves that light has wave properties? A) Images formed by lenses. B) The refraction of light as it passes from air into water. C) Interference patterns formed when light passes through a diffraction grating. D) Light reflecting off a mirror. Show Answer Correct Answer: C) Interference patterns formed when light passes through a diffraction grating. 26. In a Young's double slit experiment, the source is white light. Oneof the holes is covered by a red filter and another by a blue filter.In this case A) There shall be alternate interference patterns of red and blue. B) There shall be an interference pattern for red distinct from thatfor blue. C) There shall be no interference fringes. D) There shall be an interference pattern for red mixing with one for blue. Show Answer Correct Answer: C) There shall be no interference fringes. 27. In a double slit interference pattern, the first maxima for infrared light would be A) B) closer to the centre than the first maxima for green light. B) (a) at the same place as the first maxima for green light. C) (c) farther from the centre than the first maxima for green light. D) (d) infrared light does not produce an interference pattern. Show Answer Correct Answer: C) (c) farther from the centre than the first maxima for green light. 28. Which of the following is necessary for light to propagate? A) A air. B) B aether. C) C matter. D) D None of these are necessary. Show Answer Correct Answer: D) D None of these are necessary. 29. The refractive index of ..... is 1 and that of can be approximated to be 1. A) Air, glass. B) Vacuum, air. C) Air, water. D) Air, vacuum. Show Answer Correct Answer: B) Vacuum, air. 30. The frequency of a wave is measured in ..... A) Periods. B) Hertz. C) Inches. D) Eras. Show Answer Correct Answer: B) Hertz. 31. What will be the angular separation between central maximum and the first order maximum of the diffraction pattern due to a single slit of width 0.25 mm, when light of wavelength 6890 A$^{0 }$is incident on it normally. A) 3.5 x 10$^{-3 }$rad. B) 23 x 10$^{-3 }$rad. C) 2.3 x 10$^{-3}$ rad. D) 35 x 10$^{-3 }$ rad. Show Answer Correct Answer: A) 3.5 x 10$^{-3 }$rad. 32. The intensity of light for the interference of two light wave with a phase difference of $\phi$ A) $I=4I_o\cos\phi$. B) $I=4I_o^2\cos\phi$. C) $I=4I_o\cos\frac{\phi}{2}$. D) $I=4I_o\cos^2\\frac{\phi}{2}$. Show Answer Correct Answer: D) $I=4I_o\cos^2\\frac{\phi}{2}$. 33. Consider the diffraction pattern for a small pinhole. as the size of hole is increased then the intensity of central bright ..... A) Non of these. B) Increases. C) No change. D) Decreases. Show Answer Correct Answer: B) Increases. 34. In a Young's double-slit experiment, both the wavelength and the slit separation are increased by 50%. What happens to the distance between two adjacent bright fringes? A) It increases by 50%. B) The distance increases by 100% or more. C) The distance stays the same. D) It decreases by 50%. Show Answer Correct Answer: C) The distance stays the same. 35. Which of the following statements is untrue when applied to Young's double slit pattern A) The fringes are equally spaced. B) A bright fringe occurs when the waves arrive in phase. C) The sources must be coherent. D) The centre fringe is the brightest. Show Answer Correct Answer: D) The centre fringe is the brightest. 36. In Young's double-slit experiment, the intensity at the central maximum is I0 if one of the slit is covered, then the intensity at the central maximum become: A) $I_0$. B) $\frac{I_0}{\sqrt{2}}$. C) $\frac{I_0}{2}$. D) $\frac{I_0}{4}$. Show Answer Correct Answer: D) $\frac{I_0}{4}$. 37. Interference effects observed in the early 1800swere instrumental in supporting a concept of theexistence of which property of light? A) Particle nature. B) Wave nature. C) Polarization. D) Electromagnetic character. Show Answer Correct Answer: B) Wave nature. 38. To demonstrate the phenomenon of interference, we require A) Two sources which emit radiation of same frequency. B) Two sources which emit radiation of nearly same frequency. C) Two sources which emit radiation of the same frequency and have a definite phase relationship. D) Two sources which emit radiation of different wavelength. Show Answer Correct Answer: C) Two sources which emit radiation of the same frequency and have a definite phase relationship. 39. 2Which parameter remains unchanged while a ray of light propagates from one medium to another? A) Velocity. B) Wave length. C) Frequency. D) None of the above. Show Answer Correct Answer: C) Frequency. 40. The speed of a sound wave is greatly affected by the ..... A) Properties of the medium. B) Amplitude of the sound. C) Pitch of the sound. D) Intensity of the sound. Show Answer Correct Answer: A) Properties of the medium. 41. A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 $\mu$m and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will ..... A) Shift downward by 10 fringes. B) Shift downward by nearly two fringes. C) Remain unshifted. D) Shift upward by nearly two fringes. Show Answer Correct Answer: D) Shift upward by nearly two fringes. 42. The angle of incidence at which the polarisation of light reflected from the surface of glass occurs is 58$^\circ$. The refractive index of glass is A) 1.8. B) 1.7. C) 1.6. D) 1.9. Show Answer Correct Answer: C) 1.6. 43. Which property of light does not change when it travels from one medium to another? A) Frequency. B) Velocity. C) Amplitude. D) Wavelength. Show Answer Correct Answer: A) Frequency. 44. A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 x 10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is: A) 0.15 cm. B) 0.10 cm. C) 0.20 cm. D) 0.25 cm. Show Answer Correct Answer: A) 0.15 cm. 45. It is difficult to get clear young's double slit fringes with white light because A) The frequency of white light is too high. B) The wavelength of white light is too low. C) The different colour fringes overlap. D) White light is not bright enough. Show Answer Correct Answer: C) The different colour fringes overlap. 46. A wedge shaped film has A) Non uniform thickness. B) Zero thickness at one end and it increasing towards other end. C) Zero thickness at both ends. D) Thickness increases and decreases alternately. Show Answer Correct Answer: B) Zero thickness at one end and it increasing towards other end. 47. Tan(p) = n is known as A) Huygens law. B) Brewesters law. C) Rayleigh law. D) Malus law. Show Answer Correct Answer: B) Brewesters law. 48. The bending of light rounds the corners of an obstacle is called A) Refraction. B) Diffraction. C) Polarization. D) Interference. Show Answer Correct Answer: B) Diffraction. 49. If the polarising angle for a given medium is 60$^\circ$, then the refractive index of the medium is A) $\sqrt{3}\div2$. B) $\sqrt{3}$. C) $\frac{1}{\sqrt{3}}$. D) 1. Show Answer Correct Answer: B) $\sqrt{3}$. 50. In Newton's ring experiment, the diameter of bright ring is proportional to A) Square roots of natural numbers. B) Odd natural numbers. C) Natural numbers. D) Square roots of odd natural numbers. Show Answer Correct Answer: D) Square roots of odd natural numbers. 51. What is the path difference between the two light waves coming from coherent sources, which produces 3rd maxima. A) 3$\lambda$. B) $\lambda$. C) 0. D) 2$\lambda$. Show Answer Correct Answer: A) 3$\lambda$. 52. Which of the following best differentiates interference from diffraction? A) Diffraction needs two coherent sources; interference needs one. B) Interference always produces circular fringes. C) Interference is due to superposition of waves from two sources; diffraction is due to superposition from different parts of the same wavefront. D) Interference involves division of wavefront, diffraction does not. Show Answer Correct Answer: C) Interference is due to superposition of waves from two sources; diffraction is due to superposition from different parts of the same wavefront. 53. Critical angle and refractive index are: A) Directly related. B) Equal. C) Inversely related. D) None of these. Show Answer Correct Answer: C) Inversely related. 54. In YDSE if a thin glass plate is placed in the path of on of the interference beams then A) Fringe width decreases. B) Fringe width increases. C) Fringe pattern is unaffected. D) Fringe pattern is shifted. Show Answer Correct Answer: D) Fringe pattern is shifted. 55. In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then, in the interference pattern A) The intensities of both the maxima and the minima increases. B) The intensity of the maxima increases and the minima has zero intensity. C) The intensity of the maxima decreases and that of the minima increases. D) The intensity of the maxima decreases and the minima has zero intensity. Show Answer Correct Answer: A) The intensities of both the maxima and the minima increases. 56. The doppler shift for a sodium light line at 589.0 nm is observed at 589.6 nm. This shows ..... A) Red shift. B) Blue shift. C) All the above. D) None of the above. Show Answer Correct Answer: A) Red shift. 57. In Young's two-slit experiment, a source of green light is used. The separation of fringes in the interference pattern produced can be increased by increasing A) The distance between the screen and the slit. B) The size of every slit. C) The distance between the two slits. D) The intensity of the green light. Show Answer Correct Answer: A) The distance between the screen and the slit. 58. When a ray of light travels from a denser to a rarer medium, it A) It bends towards the normal d) None of the above. B) B) it travels in a straight line irrespective of angle of incidence. C) C) it bends away from the normal. D) D) None of the above. Show Answer Correct Answer: C) C) it bends away from the normal. 59. The relative index of refraction between two media is 1.20. Compared to the velocity of ligh tin medium 1, the velocity of light in medium 2 will be ..... A) Reduced by 1.2 times. B) The velocity will depend on the two media. C) Greater by 1.2 times. D) The same. Show Answer Correct Answer: A) Reduced by 1.2 times. 60. A laser beam is coherent because it contains A) Coherent waves of several wavelengths. B) Coherent waves of a single wavelength. C) Waves of several wavelengths. D) Incoherent waves of a single wavelength. Show Answer Correct Answer: B) Coherent waves of a single wavelength. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 11 Dual Nature Of Radiation And Matter QuizClass 12 Physics (Part Ii) Chapter 12 Atoms QuizClass 12 Physics (Part Ii) Chapter 13 Nuclei QuizClass 12 Physics (Part Ii) Chapter 14 Semiconductor Electronics Materials Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books