This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the value of coherent time if L is the coherent length and c is the velocity of light? A) CL. B) L/c. C) C/L. D) 1/Lc. Show Answer Correct Answer: B) L/c. 2. Coherent sources have same A) Frequency. B) Wavelength. C) Phase. D) All the above. Show Answer Correct Answer: D) All the above. 3. For the Michelson interferometer to work accurately, the two mirrors must be: A) At 45$^\circ$ to each other. B) Perfectly parallel. C) Slightly tilted. D) At 90$^\circ$ to each other. Show Answer Correct Answer: D) At 90$^\circ$ to each other. 4. The dual nature of light is exhibited by ..... A) Photoelectric effect. B) Refraction and interference. C) Diffraction and reflection. D) Diffraction and photoelectric effect. Show Answer Correct Answer: D) Diffraction and photoelectric effect. 5. In Young's double slit experiment, constructive interference occurs when the path difference between the two waves is: A) An odd multiple of half wavelengths. B) A multiple of the wavelength. C) Zero only. D) Equal to the distance between the slits. Show Answer Correct Answer: B) A multiple of the wavelength. 6. If I$_{0}$ is the intensity of principal maximum in the single slit diffraction pattern, then what will be its intensity when slit width is double A) 2I$_{0}$. B) 4I$_{0}$. C) I$_{0}$. D) I$_{0 }$/2. Show Answer Correct Answer: C) I$_{0}$. 7. The ratio of intensities of two light sources in YDSE is 4:1. The ratio of their amplitudes will be: A) 4:1. B) 1:4. C) 16:1. D) 2:1. Show Answer Correct Answer: D) 2:1. 8. Which of these best describes a key difference in geometry between Fresnel and Fraunhofer diffraction? A) Fraunhofer uses diverging sources, Fresnel does not. B) Fresnel requires at least two slits. C) Fresnel is near-field, Fraunhofer is far-field. D) Fraunhofer occurs only in vacuum. Show Answer Correct Answer: C) Fresnel is near-field, Fraunhofer is far-field. 9. In diffraction pattern A) We get the fringes of same intensities. B) We get all the fringed of same width. C) We get the fringes of different intensities and different width. D) We get fringes of same intensites but different width. Show Answer Correct Answer: C) We get the fringes of different intensities and different width. 10. You observe two very closely-spaced sources of white light through a circular opening using various filters. Which color filter is most likely in resolving the images on your retinas as coming from two distinct sources? A) Red. B) Yellow. C) Green. D) Blue. Show Answer Correct Answer: D) Blue. 11. Which one of the following phenomena is not explain by Huygen's construction of wavefront? A) Refraction. B) Reflection. C) Diffraction. D) Origin of spectra. Show Answer Correct Answer: D) Origin of spectra. 12. The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be A) Violet. B) Red. C) Green. D) Yellow. Show Answer Correct Answer: B) Red. 13. For the greatest amount of diffraction to occur when a wave reaches a barrier, the barrier must be A) Largerthan the wavelength. B) Atleast twice the size of the wavelength. C) Thesame size or smaller than the wavelength. D) Theexact same size as the wavelength. Show Answer Correct Answer: C) Thesame size or smaller than the wavelength. 14. As a result of interference of two coherent sources of light, energy is ..... A) Increased. B) Redistributed and the distribution does not vary with time. C) Decreased. D) Redistributed and the distribution changes with time. Show Answer Correct Answer: B) Redistributed and the distribution does not vary with time. 15. For destructive interference, A) Crest of one wave coincides with trough of other. B) Trough of one wave coincides with trough of the other. C) Crest of one wave coincides with crest of other. D) Formation of crest and trough is not necessary. Show Answer Correct Answer: A) Crest of one wave coincides with trough of other. 16. Wavelength of an incident light when it is incident normally on a diffraction grating having 3000 lines per centimeter angular separation is 10$^\circ$ is A) 500 nm. B) 650 nm. C) 580 nm. D) 600 nm. Show Answer Correct Answer: C) 580 nm. 17. In young's double slit experiment A) All fringes have same thickness. B) Central bright is of double width. C) Central fringe is intense. D) Thickness of fringes decreases gradually. Show Answer Correct Answer: A) All fringes have same thickness. 18. What is the primary cause of the colors seen in a soap bubble? A) Reflection of light. B) Refraction of light. C) Interference of light. D) Diffraction of light. Show Answer Correct Answer: C) Interference of light. 19. When waves come together to for a larger wave for a brief period of time A) Additive waves. B) Constructive waves. C) Subtractive waves. D) Destructive waves. Show Answer Correct Answer: B) Constructive waves. 20. Two coherent monochromatic light beams of intensities I and 4I superimpose. The maximum and minimum possible intensities in the resulting beam are A) 5I and I. B) 5I and 3I. C) 3I and I. D) 9I and I. Show Answer Correct Answer: D) 9I and I. 21. In which type of diffraction, diffracted light is collected by a lens in a telescope A) Fresnel's. B) Fraunhoffer's. C) Both. D) None. Show Answer Correct Answer: B) Fraunhoffer's. 22. Glass plate of refractive index 1.732 is to be used as a polariser, its polarising angle is A) 30$^\circ$. B) 45$^\circ$. C) 60$^\circ$. D) 90$^\circ$. Show Answer Correct Answer: C) 60$^\circ$. 23. In YDSE uses a monochromatic source. The shape of the interference fringes formed on the screen is A) Hyperbola. B) Circle. C) Straight line. D) Parabola. Show Answer Correct Answer: A) Hyperbola. 24. In the Nicol Prism experiment, the calcite crystal length is x times its breadth. What is x? A) 2. B) 3. C) 1/2. D) 1/3. Show Answer Correct Answer: B) 3. 25. Refraction occurs when ..... A) The wave's speed changes by entering a new medium. B) A wave bounces off of a boundary. C) Waves parts meet each other. D) Waves bend around a barrier. Show Answer Correct Answer: A) The wave's speed changes by entering a new medium. ← 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 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