This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 10 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Approximately how much light is blocked by two polarizing filters that are perpendicular to each other? A) 0%. B) 50%. C) 75%. D) 100%. Show Answer Correct Answer: D) 100%. 2. Two wave are said to be a coherent, if they have A) Same phase & different amplitude. B) Same frequency, phase & amplitude. C) Same frequency but different amplitude. D) Difference frequency, phase & amplitude. Show Answer Correct Answer: B) Same frequency, phase & amplitude. 3. Intensity of secondary maxima in diffraction has A) Same intensity as central maxima. B) Less intensity than central maxima. C) More intensity than central maxima. D) None of these. Show Answer Correct Answer: C) More intensity than central maxima. 4. Huygens wave theory couldn't explain A) Diffraction. B) Interference. C) Polarisation. D) Photoelectric effect. Show Answer Correct Answer: D) Photoelectric effect. 5. In YDSE the separation between the slits and the distance between slits and screen both are halved. What will be effect on the interference pattern observed? A) No effect. B) Fringe width will be doubled. C) Fringe width will be 4 times. D) Fringe width will be 1/4 times. Show Answer Correct Answer: A) No effect. 6. The phenomenon of beats is due to A) Superposition of incoherent waves. B) Superposition of coherent waves. C) Reflection. D) Refraction. Show Answer Correct Answer: B) Superposition of coherent waves. 7. .In Young's double-slit experiment, if there is no initial phase difference between the light from two slits, a point on the screen corresponding to the fifth minimum has path difference A) 5 $\lambda$/2. B) 57$\lambda$/. C) 9 $\lambda$/2. D) 11$\lambda$/2. Show Answer Correct Answer: C) 9 $\lambda$/2. 8. Condition for getting bright fringe in YDSE is A) $x=\frac{\left(2n+1\right)\lambda}{2}$. B) $x=\frac{\left(2n-1\right)\lambda}{2}$. C) $x=\left(n+1\right)\lambda$. D) $x=n\lambda$. Show Answer Correct Answer: D) $x=n\lambda$. 9. Thin film of kerosene on water surface appear coloured due to A) Scattering. B) Dispersion. C) Interference. D) Refraction. Show Answer Correct Answer: C) Interference. 10. What is the primary reason for using a diffraction grating in optical experiments? A) To reflect light. B) To separate different wavelengths. C) To polarize light. D) To focus light. Show Answer Correct Answer: B) To separate different wavelengths. 11. The working of Nicole prism is based on the phenomenon of ..... A) Refraction. B) Reflection. C) Diffraction. D) Double Refraction. Show Answer Correct Answer: D) Double Refraction. 12. Wavefront means ..... A) All particles in it have same phase. B) All particles have opposite phase of vibrations. C) All particles have opposite phase of vibrations. D) None of these. Show Answer Correct Answer: A) All particles in it have same phase. 13. When the light falls normally on a small-angled wedge film then the fringe width $\beta$ A) $\beta=\frac{\lambda}{2\mu\cos\alpha}$. B) $\beta=\frac{\lambda}{\mu\alpha}$. C) $\beta=\frac{\lambda}{2\\tan\alpha\sqrt{\mu^2-\sin^2i}}$. D) $\beta=\frac{\lambda}{2\mu\alpha}$. Show Answer Correct Answer: D) $\beta=\frac{\lambda}{2\mu\alpha}$. 14. Which one of the following phenomena is not explained by Huygen's construction of wavefront ..... A) Refraction. B) Reflection. C) Diffraction. D) Origin of spectra. Show Answer Correct Answer: D) Origin of spectra. 15. Consider the diffraction pattern for a small pinhole. as the size of hole is increased then the central bright ..... A) The size decreases. B) The size increases. C) No change. D) No effect. Show Answer Correct Answer: A) The size decreases. 16. When Sunlight strikes air molecules ordust particles in the atmosphere, it changesits direction. This is called ..... A) Scattering. B) Dispersion. C) Polarization. D) Interference. Show Answer Correct Answer: A) Scattering. 17. If the 2nd order maximum for a double-slit experiment occurs at an angle of 45.0$^{o}$, what is the relationship between the wavelength and the distance between the slits? A) D = 1.41 $\lambda$. B) D = 2.00 $\lambda$. C) D = 2.83 $\lambda$. D) D = 4.00 $\lambda$. Show Answer Correct Answer: C) D = 2.83 $\lambda$. 18. On passing a plane wavefront through a concave lens, we get a A) Plane wavefront. B) Spherical wavefront. C) Cylindrical wavefront. D) Parabolic wavefront. Show Answer Correct Answer: B) Spherical wavefront. 19. Consider the diffraction pattern for a small pinhole. As the size of the hole is increased A) The size decreases. B) The intensity decreases. C) The size increases. D) The intensity decreases. Show Answer Correct Answer: A) The size decreases. 20. According to the above given fig., identify the correct expression for Snell's law. A) A) n1 sin i = n2 sin r. B) B) n2 sin i = n1 sin r. C) C) n21 = sin r/ sin i. D) None of these. Show Answer Correct Answer: A) A) n1 sin i = n2 sin r. 21. Two waves interfere constructively when their optical path lengths ..... A) Are unequal. B) Are equal or differ by integral multiples of wavelength. C) Are equal or differ by even integral multiples of wavelength. D) Are equal or differ by odd integral multiples of wavelength. Show Answer Correct Answer: B) Are equal or differ by integral multiples of wavelength. 22. A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be ..... A) 1 mm. B) 2 mm. C) 4 mm. D) 5 mm. Show Answer Correct Answer: C) 4 mm. 23. The index of refraction of air is approximately ..... A) 0.5. B) 1.0. C) 1.5. D) 2.0. Show Answer Correct Answer: B) 1.0. 24. If the speed of a wave remains constant, and the wavelength is doubled, then the frequency will be ..... A) Doubled. B) Quadrupled. C) Halved. D) Remains constant. Show Answer Correct Answer: C) Halved. 25. The energy of the wave travels in a direction ..... to the wavefront. A) Similarly. B) Oppositely. C) Perpendicularly. D) None. Show Answer Correct Answer: C) Perpendicularly. ← 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 8Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 9Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books