This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When compact disk is illuminated by a source of white light, coloured lines are observed. This is due to A) Dispersion. B) Diffraction. C) Interference. D) Refraction. Show Answer Correct Answer: B) Diffraction. 2. If waves overlap and are out of phase, how will that affect the resultant wave? A) Decrease the amplitude. B) Increase the amplitude. C) Decrease the frequency. D) Increase the frequency. Show Answer Correct Answer: A) Decrease the amplitude. 3. An object is placed at a distance of 0.5 m in front of a plane mirror. The distance between object and image will be: A) 0.25 m. B) 0.5 m. C) 1.0 m. D) 2.0 m. Show Answer Correct Answer: C) 1.0 m. 4. Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where: A) The crests from both waves overlap. B) The crest from one wave overlaps with the trough from the other. C) The troughs from both waves overlap. D) Darkness cannot occur as the two waves are coherent. Show Answer Correct Answer: B) The crest from one wave overlaps with the trough from the other. 5. The fringe width in interference is: A) Inversely proportional to wavelength. B) Inversely proportional to slit width. C) Directly proportional to slit separation. D) Directly proportional to wavelength. Show Answer Correct Answer: D) Directly proportional to wavelength. 6. What is common with all electromagnetic and mechanical waves? A) They travel at the same speed. B) They transfer energy. C) They are all longitudinal waves. D) They are all transverse waves. Show Answer Correct Answer: B) They transfer energy. 7. How does the diffraction band of blue light look in comparison with the red light? 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. 8. Two coherent sources of light can be obtained by ..... A) Two different lamps. B) Two different lamps but of the same power. C) Two different lamps of same power and having the same colour. D) None of the above. Show Answer Correct Answer: D) None of the above. 9. Young's double slit experiment has two slits. A) True. B) False. C) Both a and b. D) None of the above. Show Answer Correct Answer: A) True. 10. For a total internal reflection, which of the following is correct? A) Light travels from rarer to denser medium. B) Light travels from denser to rarer medium. C) Light travels in air only. D) Light travels in water only. Show Answer Correct Answer: B) Light travels from denser to rarer medium. 11. Light is considered to be A) Electromagnetic waves. B) Particles. C) Transverse waves. D) All of the above. Show Answer Correct Answer: D) All of the above. 12. Bending of light at sharp edges of obstacles is due to A) Polarization. B) Diffraction. C) Refraction. D) Interference. Show Answer Correct Answer: B) Diffraction. 13. Approximately how much light is blocked by a single polarizing filter? A) 0%. B) 50%. C) 75%. D) 100%. Show Answer Correct Answer: B) 50%. 14. Which would have the widest-spaced fringe pattern for light traveling through a diffraction grating? A) Large wavelength and a small slit spacing. B) Small wavelength and small slit spacing. C) Large wavelength and a large slit spacing. D) Small wavelength and a large slit spacing. Show Answer Correct Answer: A) Large wavelength and a small slit spacing. 15. The refractive index of glass is 1.5 for light waves of X = 6000 A in vacuum. Its wavelength in glass is A) 2000. B) 4000. C) 1000. D) 3000. Show Answer Correct Answer: B) 4000. 16. In Fraunhofer class of diffraction A) The source and screen are at infinite distance. B) The source is at finite distance and screen is at infinite distance. C) The source and screen are at a finite distance. D) The source is at infinite distance and screen is at a finite distance. Show Answer Correct Answer: A) The source and screen are at infinite distance. 17. What is path difference for destructive interference? A) N$\lambda$. B) N($\lambda$ +1). C) (2n + 1)$\lambda$/2. D) (n +1)$\lambda$/2. Show Answer Correct Answer: C) (2n + 1)$\lambda$/2. 18. Bending of light from sharp edges is called A) Reflection. B) Refraction. C) Dispersion. D) Polarisation. Show Answer Correct Answer: C) Dispersion. 19. If the velocity of light in a medium depends on its frequency, the medium is said to be A) Refractive. B) Resonant. C) Diffractive. D) Dispersive. Show Answer Correct Answer: D) Dispersive. 20. The wavefront due to a source situated at infinity is A) Spherical. B) Cylindrical. C) Planar. D) Circular. Show Answer Correct Answer: C) Planar. 21. For Young's double slit interference the fringe width $\beta$ A) $\frac{\lambda D}{d}$. B) $\frac{\lambda d}{D}$. C) $\frac{D}{\lambda d}$. D) $\frac{d}{\lambda D}$. Show Answer Correct Answer: A) $\frac{\lambda D}{d}$. 22. The idea of secondary wavelets for the. propagation of a wave was first given by A) Newton. B) Huygens. C) Maxwell. D) Fresnel. Show Answer Correct Answer: B) Huygens. 23. What is the minimum distancebetween two objects which can be resolvedby a microscope having the visual angle of300 when light of wavelength 500 nm is used? A) 3.1 x10$^{-8 }$m. B) 4.1 x 10$^{7}$m. C) 6.1 x 10-7 m. D) 7.1x 10$^{-7}$m. Show Answer Correct Answer: C) 6.1 x 10-7 m. 24. The centre of interference pattern is A) Always bright. B) Always dark. C) May be bright or dark. D) Brightness changes continuously. Show Answer Correct Answer: A) Always bright. 25. The bending of a wave caused by a change in its speed as it moves from one medium to another. A) Reflection. B) Rarefaction. C) Refraction. D) None of the above. Show Answer Correct Answer: C) Refraction. Next →Related QuizzesClass 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 10Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books