This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Soap bubble appears coloured due to the phenomenon of ..... A) Interference. B) Diffraction. C) Dispersion. D) Reflection. Show Answer Correct Answer: A) Interference. 2. Diffraction of light is the A) Splitting of a white ray of light in seven colour rays. B) Superposition of waves emitted from coherent sources. C) Bending of light around the corners of a very thin aperature. D) Bending of light when it travels from one medium to another medium. Show Answer Correct Answer: C) Bending of light around the corners of a very thin aperature. 3. Which parameter changes while a ray of light propagates from one medium to another? A) Velocity. B) Wave length. C) Frequency. D) Both a and b. Show Answer Correct Answer: D) Both a and b. 4. What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm A) 0.001 rad. B) 0.01 rad. C) 1 rad. D) 0.1 rad. Show Answer Correct Answer: A) 0.001 rad. 5. A wavefront is defined as a surface of ..... A) Variable Phase. B) Constant Phase. C) All the above. D) None of the above. Show Answer Correct Answer: B) Constant Phase. 6. What is the role of the mirrors in a Michelson interferometer? A) To absorb excess light. B) To change the polarization of the light. C) To focus the light onto a detector. D) To reflect the light beams back to the beam splitter. Show Answer Correct Answer: D) To reflect the light beams back to the beam splitter. 7. Diffraction aspect is easier to notice in case of the sound waves then in case of the light waves because sound waves A) Have longer wavelength. B) Shorter wavelength. C) Longitudinal wave. D) Transverse waves. Show Answer Correct Answer: A) Have longer wavelength. 8. What is the angle made by the ray of light on the wave front? A) 90. B) 0. C) 45. D) 60. Show Answer Correct Answer: A) 90. 9. Which of the following is conserved when light waves interfere ..... A) Intensity. B) Energy. C) Amplitude. D) Momentum. Show Answer Correct Answer: B) Energy. 10. Two wave having intensity in the ratio 25:4 produce interference . The ratio of maximum to the minimum intensity will be A) 5:2. B) 2:5. C) 9:49. D) 49:9. Show Answer Correct Answer: D) 49:9. 11. The alternate bright and dark bands of light due to interference are called as interference fringes. A) False. B) True. C) None of the above. D) None of the above. Show Answer Correct Answer: B) True. 12. Two tunning forks have frequencies 412 Hz and 409 He respectively. Calculate the period of the beat. A) 0.13 s. B) 1.33 s. C) 0.33 s. D) 1.03 s. Show Answer Correct Answer: C) 0.33 s. 13. If a plane wavefront is incident on a concave mirror, then the emergent wavefront will be ..... of the mirror as its centre. A) Conical with focus. B) Spherical with focus. C) Spherical with centre of the curvature of the surface. D) Conical with centre of the curvature of the surface. Show Answer Correct Answer: B) Spherical with focus. 14. If it takes a waves 2.0 s to travel a distance of 10 meters, what is the wave speed? A) 0.2 m/s. B) 5 m/s. C) 12 m/s. D) 20 m/s. Show Answer Correct Answer: B) 5 m/s. 15. Wavelength of light of frequency 100Hz A) 2 x 10$^{6}$ m. B) 3 x 10$^{6}$ m. C) 4 x 10$^{6}$ m. D) 5 x 10$^{6}$ m. Show Answer Correct Answer: B) 3 x 10$^{6}$ m. 16. Huygen's originally thought that for the propagation of light waves wavefront is required. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 17. Ratio of intensities of two waves are given by 4:1. Then the ratio of amplitudes of the two wave is A) 2:1. B) 1:2. C) 4:1. D) 1:4. Show Answer Correct Answer: A) 2:1. 18. Huygens' principle fails to explain which of the following? A) Refraction. B) Diffraction. C) Interference. D) Polarization. Show Answer Correct Answer: D) Polarization. 19. What do we mean when we say that two lightrays striking a screen are in phase with each other? A) When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes. B) They are traveling at the same speed. C) They have the same wavelength. D) They alternately reinforce and cancel each other. Show Answer Correct Answer: A) When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes. 20. The Michelson interferometer works based on which optical principle? A) Reflection. B) Diffraction. C) Refraction. D) Interference. Show Answer Correct Answer: D) Interference. 21. The spherical wave front is received A) Near the Sun. B) Near a lighting tube-light. C) When the light wave is coming from Sun to Earth. D) All of the above. Show Answer Correct Answer: A) Near the Sun. 22. In Young's double slit experiment, which laser would result in the closest together bright spots? A) Violet (410 nm). B) Blue (450 nm). C) Green (550 nm). D) Red (650 nm). Show Answer Correct Answer: A) Violet (410 nm). 23. The colours on the soap bubble is due to A) Interference. B) Polarisation. C) Diffraction. D) Reflection. Show Answer Correct Answer: A) Interference. 24. A beam of light which consists of two different wavelength $\lambda_1$ $\lambda_2$ $\lambda_1>\lambda_2$ $\lambda_1$ $\lambda_2$ $\frac{\lambda_1}{\lambda_2}$ A) 1.5. B) 2.0. C) 2.5. D) 3.0. Show Answer Correct Answer: A) 1.5. 25. The width of diffraction band varies A) Inversely as the wavelength. B) Directly as the width of the slit. C) Directly as the distance between the slit and the screen. D) Inversely as the size of the source from which the slit is illuminated. Show Answer Correct Answer: C) Directly as the distance between the slit and the screen. ← 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 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