This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The nature of the wavefront for a point source of light is ..... A) Spherical wanefront. B) Plane wavefront. C) All the above. D) None of the above. Show Answer Correct Answer: A) Spherical wanefront. 2. According to Brewster's law, at polarising angle, the reflected and refracted rays are A) Parallel to each other. B) Antiparallel to each other. C) Perpendicular to each other. D) At 40$^\circ$ to each other. Show Answer Correct Answer: C) Perpendicular to each other. 3. A repeating and periodic disturbance that travels from one location to another carrying energy A) Trough. B) Wave. C) Amplitude. D) Energy. Show Answer Correct Answer: B) Wave. 4. When the wavelength and wave speed are quadrupled, then the wave's frequency will be ..... A) Doubled. B) Quadrupled. C) Constant. D) Halved. Show Answer Correct Answer: C) Constant. 5. Polarization of light is best described by A) The bouncing back of light form mirror. B) The splitting of white light into seven colours. C) Restricting component of light in a particular direction. D) Change of direction of light when it passes form one transparent medium to another. Show Answer Correct Answer: C) Restricting component of light in a particular direction. 6. A wavefront is defined as a surface of ..... phase. A) Constant. B) Increasing. C) Decreasing. D) Time variable. Show Answer Correct Answer: A) Constant. 7. Two slits in Young's double slit experiment have widths in the ratio 81:1. The ratio of the amplitudes of light waves is A) ) 3:1(b) (c) (d) 6:1. B) 3:2. C) 9:1. D) 6:1. Show Answer Correct Answer: C) 9:1. 8. If a wave is traveling at 15 m/s and has a frequency of 5.0 Hz, what is its wavelength? A) 0.33 m. B) 3 m. C) 20 m. D) 75 m. Show Answer Correct Answer: B) 3 m. 9. A star appears to be white according to its spectral composition, but it appears blue when observed through a telescope. What is the best explanation for this phenomenon? A) A The object is moving toward Earth. B) B The object is moving away from Earth. C) C The object is moving parallel to Earth. D) D all of the above. Show Answer Correct Answer: A) A The object is moving toward Earth. 10. Which of these is the correct expression for Malus law for polarization of light A) $I=I_o\cos^2\theta$. B) $I=I_o\cos^2\\frac{\theta}{2}$. C) $I=I_o\cos\theta$. D) $I=I_o^2\cos\theta$. Show Answer Correct Answer: A) $I=I_o\cos^2\theta$. 11. In YDSE is carried out green, red, blue light one color at atime .The fringe width recorded are $\beta$$_{G}$ $\beta$$_{R}$ $\beta$$_{B}$ respectively ; Then A) $\beta$$_{R}$ < $\beta$$_{B}$<$_{ }$$\beta$$_{G }$. B) $\beta$$_{G}$ < $\beta$$_{R}$ < $\beta$$_{B}$. C) $\beta$$_{R }$< $_{ }$$\beta$$_{G}$ < $\beta$$_{B}$. D) $\beta$$_{B }$<$_{ }$$\beta$$_{G }$<$_{ }$$\beta$$_{R}$. Show Answer Correct Answer: D) $\beta$$_{B }$<$_{ }$$\beta$$_{G }$<$_{ }$$\beta$$_{R}$. 12. Constructive interference of light results in dark fringe A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 13. The ratio of the widths of two slits in Young's double slit experiment is 4:1. Evaluate the ratio of intensities at maxima and minima in the interference pattern. A) 1:1. B) 1:4. C) 3:1. D) 9:1. Show Answer Correct Answer: D) 9:1. 14. A sound wave differs from a light wave because a sound wave ..... A) Is produced by an oscillating object and a light wave is not. B) Is not capable of traveling through a vacuum. C) Is not capable of diffracting and a light wave is. D) Is capable of existing with a variety of frequencies and a light wave has a single frequency. Show Answer Correct Answer: B) Is not capable of traveling through a vacuum. 15. If on rotating an analyser there no variation in the intensity of light then the light is A) Plane polarized. B) Unpolarized. C) Partially polarized. D) Extra ordinary. Show Answer Correct Answer: B) Unpolarized. 16. Visible light wavelengths range from 400 nm-700 nm. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 17. Light waves travelling through air strike the surface water at an angle. Which of the following statements is correct? A) The light speed, frequency and wavelength all stay the same. B) The light speed, frequency and wavelength all change. C) The light speed and frequency change, but the wavelength stays the same. D) The light wavelength and speed change but frequency stays the same. Show Answer Correct Answer: D) The light wavelength and speed change but frequency stays the same. 18. In Young's double slit experiment, the two coherent sources have different intensities. If the ratio of maximum intensity to the minimum intensity in the interference pattern produced is25:1. What was the ratio of intensities of the two A) 5:1. B) 25:1. C) 3:2. D) 9:4. Show Answer Correct Answer: D) 9:4. 19. The term coherence relates to ..... A) The phase relationship between two waves. B) The polarization state of two waves. C) The diffraction of two waves. D) The amplitude of two waves. Show Answer Correct Answer: A) The phase relationship between two waves. 20. For diffraction of light condition of getting secondary minima is A) $x=\frac{\left(2n+1\right)\lambda}{2}$. B) $x=\left(2n+1\right)\lambda$. C) $x=n\lambda$. D) None of these. Show Answer Correct Answer: C) $x=n\lambda$. 21. In vacuum optical path is A) Equal to actual path travelled. B) Less than actual path travelled. C) Greater than actual path travelled. D) Infinite. Show Answer Correct Answer: A) Equal to actual path travelled. 22. The phenomena which is not explained by Huygen's construction of wavefront A) Reflection. B) Diffraction. C) Refraction. D) Origin of spectra. Show Answer Correct Answer: D) Origin of spectra. 23. If the intensity of a monochromatic ray of light is increased while the ray is incident on a pair of narrow slits, the spacing between maxima in the diffraction pattern will be ..... A) Increased. B) Decreased. C) The same. D) Increased or decreased, depending on frequency. Show Answer Correct Answer: C) The same. 24. Resolving power of microscope depends upon A) Wavelength of light used (directly proportional). B) Wavelength of light used (inversely proportional). C) Frequency of light used. D) Focal length of objective. Show Answer Correct Answer: B) Wavelength of light used (inversely proportional). 25. Which condition is essential for superposition to produce observable interference patterns? A) Waves must travel in opposite directions. B) Waves must have different velocities. C) Waves must be coherent. D) Waves must be polarized. Show Answer Correct Answer: C) Waves must be coherent. ← 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 10Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books