This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part Ii) Chapter 10 Wave Optics – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 10 Wave Optics Quiz 5 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 2Which parameter remains unchanged while a ray of light propagates from one medium to another? A) Velocity. B) Wave length. C) Frequency. D) None of the above. Show Answer Correct Answer: C) Frequency. 2. The speed of a sound wave is greatly affected by the ..... A) Amplitude of the sound. B) Pitch of the sound. C) Intensity of the sound. D) Properties of the medium. Show Answer Correct Answer: D) Properties of the medium. 3. A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 $\mu$m and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will ..... A) Remain unshifted. B) Shift downward by nearly two fringes. C) Shift upward by nearly two fringes. D) Shift downward by 10 fringes. Show Answer Correct Answer: C) Shift upward by nearly two fringes. 4. The angle of incidence at which the polarisation of light reflected from the surface of glass occurs is 58$^\circ$. The refractive index of glass is A) 1.9. B) 1.8. C) 1.7. D) 1.6. Show Answer Correct Answer: D) 1.6. 5. Which property of light does not change when it travels from one medium to another? A) Velocity. B) Wavelength. C) Amplitude. D) Frequency. Show Answer Correct Answer: D) Frequency. 6. A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 x 10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is: A) 0.20 cm. B) 0.15 cm. C) 0.25 cm. D) 0.10 cm. Show Answer Correct Answer: B) 0.15 cm. 7. It is difficult to get clear young's double slit fringes with white light because A) The frequency of white light is too high. B) The wavelength of white light is too low. C) The different colour fringes overlap. D) White light is not bright enough. Show Answer Correct Answer: C) The different colour fringes overlap. 8. A wedge shaped film has A) Non uniform thickness. B) Zero thickness at one end and it increasing towards other end. C) Zero thickness at both ends. D) Thickness increases and decreases alternately. Show Answer Correct Answer: B) Zero thickness at one end and it increasing towards other end. 9. Tan(p) = n is known as A) Malus law. B) Rayleigh law. C) Huygens law. D) Brewesters law. Show Answer Correct Answer: D) Brewesters law. 10. The bending of light rounds the corners of an obstacle is called A) Diffraction. B) Interference. C) Polarization. D) Refraction. Show Answer Correct Answer: A) Diffraction. 11. If the polarising angle for a given medium is 60$^\circ$, then the refractive index of the medium is A) $\frac{1}{\sqrt{3}}$. B) $\sqrt{3}\div2$. C) 1. D) $\sqrt{3}$. Show Answer Correct Answer: D) $\sqrt{3}$. 12. In Newton's ring experiment, the diameter of bright ring is proportional to A) Odd natural numbers. B) Natural numbers. C) Square roots of odd natural numbers. D) Square roots of natural numbers. Show Answer Correct Answer: C) Square roots of odd natural numbers. 13. What is the path difference between the two light waves coming from coherent sources, which produces 3rd maxima. A) $\lambda$. B) 2$\lambda$. C) 3$\lambda$. D) 0. Show Answer Correct Answer: C) 3$\lambda$. 14. Which of the following best differentiates interference from diffraction? A) Diffraction needs two coherent sources; interference needs one. B) Interference involves division of wavefront, diffraction does not. C) Interference is due to superposition of waves from two sources; diffraction is due to superposition from different parts of the same wavefront. D) Interference always produces circular fringes. Show Answer Correct Answer: C) Interference is due to superposition of waves from two sources; diffraction is due to superposition from different parts of the same wavefront. 15. Critical angle and refractive index are: A) Directly related. B) Equal. C) Inversely related. D) None of these. Show Answer Correct Answer: C) Inversely related. 16. In YDSE if a thin glass plate is placed in the path of on of the interference beams then A) Fringe width decreases. B) Fringe width increases. C) Fringe pattern is shifted. D) Fringe pattern is unaffected. Show Answer Correct Answer: C) Fringe pattern is shifted. 17. In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then, in the interference pattern A) The intensities of both the maxima and the minima increases. B) The intensity of the maxima increases and the minima has zero intensity. C) The intensity of the maxima decreases and that of the minima increases. D) The intensity of the maxima decreases and the minima has zero intensity. Show Answer Correct Answer: A) The intensities of both the maxima and the minima increases. 18. The doppler shift for a sodium light line at 589.0 nm is observed at 589.6 nm. This shows ..... A) Red shift. B) Blue shift. C) All the above. D) None of the above. Show Answer Correct Answer: A) Red shift. 19. In Young's two-slit experiment, a source of green light is used. The separation of fringes in the interference pattern produced can be increased by increasing A) The distance between the screen and the slit. B) The size of every slit. C) The distance between the two slits. D) The intensity of the green light. Show Answer Correct Answer: A) The distance between the screen and the slit. 20. When a ray of light travels from a denser to a rarer medium, it A) It bends towards the normal d) None of the above. B) B) it travels in a straight line irrespective of angle of incidence. C) C) it bends away from the normal. D) D) None of the above. Show Answer Correct Answer: C) C) it bends away from the normal. 21. The frequencies of X-rays, gama-rays and ultraviolet rays are respectively a, b and c. Then ..... A) A < b, b > c. B) A > b, b > c. C) A > b, b < c. D) A < b, b < c. Show Answer Correct Answer: A) A < b, b > c. 22. The relative index of refraction between two media is 1.20. Compared to the velocity of ligh tin medium 1, the velocity of light in medium 2 will be ..... A) Greater by 1.2 times. B) Reduced by 1.2 times. C) The same. D) The velocity will depend on the two media. Show Answer Correct Answer: B) Reduced by 1.2 times. 23. A laser beam is coherent because it contains A) Waves of several wavelengths. B) Incoherent waves of a single wavelength. C) Coherent waves of several wavelengths. D) Coherent waves of a single wavelength. Show Answer Correct Answer: D) Coherent waves of a single wavelength. 24. What is the shape of the wavefront on earth for sunlight? A) Spherical. B) Cylindrical. C) Plane. D) None of these. Show Answer Correct Answer: C) Plane. 25. In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions must be met? A) Sources are coherent. B) Sources are monochromatic. C) Both choices above are valid. D) None of the choices are valid. Show Answer Correct Answer: C) Both choices above are valid. ← 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 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