This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the highest order maximum for wavelength 450 nm that can be obtained with a grating with 600 lines per millimeter? A) 3. B) 4. C) 6. D) 7. Show Answer Correct Answer: A) 3. 2. 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. 3. Which of the following phenomenon proves that light is a transverse wave? A) Reflection. B) Interference. C) Diffraction. D) Polarization. Show Answer Correct Answer: D) Polarization. 4. 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. 5. 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. 6. In the context of wave optics, what does the term 'coherence' refer to? A) Same amplitude of waves. B) Same frequency of waves. C) Constant phase relationship between waves. D) Ability to reflect light. Show Answer Correct Answer: C) Constant phase relationship between waves. 7. 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. 8. 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. 9. 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. 10. Superposition of family of waves originating from a slit forms ..... pattern A) Interference. B) Diffraction. C) Polarization. D) Dispersion. Show Answer Correct Answer: B) Diffraction. 11. 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. 12. Which phenomenon proves that light has wave properties? A) Images formed by lenses. B) Interference patterns formed when light passes through a diffraction grating. C) Light reflecting off a mirror. D) The refraction of light as it passes from air into water. Show Answer Correct Answer: B) Interference patterns formed when light passes through a diffraction grating. 13. 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. 14. In a double slit interference pattern, the first maxima for infrared light would be A) (a) at the same place as the first maxima for green light. B) B) closer to the centre than 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. 15. 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. 16. The refractive index of ..... is 1 and that of can be approximated to be 1. A) Vacuum, air. B) Air, vacuum. C) Air, glass. D) Air, water. Show Answer Correct Answer: A) Vacuum, air. 17. The frequency of a wave is measured in ..... A) Inches. B) Hertz. C) Periods. D) Eras. Show Answer Correct Answer: B) Hertz. 18. 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) 2.3 x 10$^{-3}$ rad. B) 23 x 10$^{-3 }$rad. C) 35 x 10$^{-3 }$ rad. D) 3.5 x 10$^{-3 }$rad. Show Answer Correct Answer: D) 3.5 x 10$^{-3 }$rad. 19. The intensity of light for the interference of two light wave with a phase difference of $\phi$ A) $I=4I_o\cos\frac{\phi}{2}$. B) $I=4I_o\cos^2\\frac{\phi}{2}$. C) $I=4I_o\cos\phi$. D) $I=4I_o^2\cos\phi$. Show Answer Correct Answer: B) $I=4I_o\cos^2\\frac{\phi}{2}$. 20. Consider the diffraction pattern for a small pinhole. as the size of hole is increased then the intensity of central bright ..... A) No change. B) Decreases. C) Increases. D) Non of these. Show Answer Correct Answer: C) Increases. 21. 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) It decreases by 50%. C) The distance stays the same. D) The distance increases by 100% or more. Show Answer Correct Answer: C) The distance stays the same. 22. 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. 23. 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) $\frac{I_0}{2}$. B) $\frac{I_0}{\sqrt{2}}$. C) $\frac{I_0}{4}$. D) $I_0$. Show Answer Correct Answer: C) $\frac{I_0}{4}$. 24. Interference effects observed in the early 1800swere instrumental in supporting a concept of theexistence of which property of light? A) Polarization. B) Particle nature. C) Wave nature. D) Electromagnetic character. Show Answer Correct Answer: C) Wave nature. 25. 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. ← 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 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