This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part Ii) Chapter 17 Waves – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Teo sound waves have frequencies of 250 Hz and 300 Hz. The speed of sound is 340 m/s, What is the difference between the wavelenghts of the two waves? A) 0.23 m. B) 1.1 m. C) 1.4 m. D) 6.8 m. Show Answer Correct Answer: A) 0.23 m. 2. Music is an example of harmonic motion. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 3. How do waves transfer energy? A) By emitting light. B) By creating static electricity. C) By causing particles in the medium to vibrate back and forth. D) By changing the color of the medium. Show Answer Correct Answer: C) By causing particles in the medium to vibrate back and forth. 4. Which of the following is NOT a benefit of using digital signals to transmit information? A) Digital signals maintain their quality over long distances better than analog signals. B) Digital signals can be recorded and stored easily. C) Using a digital system can be more expensive than an analog system. D) Digitized signals are a more reliable way to encode and transmit information than analog signals. Show Answer Correct Answer: C) Using a digital system can be more expensive than an analog system. 5. Which has a longer wavelength, Radiowaves or ultraviolet waves? A) Radio. B) Ultraviolet. C) All the above. D) None of the above. Show Answer Correct Answer: A) Radio. 6. A source of sound of frequency 1000 Hz moves away from the stationary observer at a speed of 30 m/s. the speed of sound is 330 m/s. What is the frequency of sounnd heard by the observer A) 909 Hz. B) 917 Hz. C) 1090 Hz. D) 1100. Show Answer Correct Answer: B) 917 Hz. 7. A beam of monochromatic light travels through flint glass, crown glass, Lucite, and water. The speed of the light beam is slowest in A) Flint glass. B) Crown glass. C) Lucite. D) Water. Show Answer Correct Answer: A) Flint glass. 8. If a wave is traveling at a certain speed and its frequency is doubled, what happens to is wavelength? A) The wavelength doubles. B) The wavelength is halved. C) The wavelength is stopped. D) The wavelength remains the same. Show Answer Correct Answer: B) The wavelength is halved. 9. A yellow object would appear what colour when viewed through a green filter A) Green. B) Red. C) Yellow. D) Black. Show Answer Correct Answer: A) Green. 10. What kind of light has the shortest wavelength? A) Ultraviolet. B) Microwaves. C) Infrared. D) Gamma rays. Show Answer Correct Answer: D) Gamma rays. 11. The lowest part of a wave is called the ..... A) Crest. B) Trough. C) Amplitude. D) Wavelength. E) Equilibrium. Show Answer Correct Answer: B) Trough. 12. The power of a light bulb is 60W and the wavelength of the light emitted by the bulb is 520nm. What is the number of photons emitted by the bulb each second? A) 3.82 x 10$^{19}$. B) 1.57 x 10$^{20}$. C) 1.15 x 10$^{8}$. D) 1.74 x 10$^{21}$. Show Answer Correct Answer: B) 1.57 x 10$^{20}$. 13. Which of the following statements about the energy of light is correct?I The energy of a light wave increases with increasing amplitude. II The energy of a light wave increases with increasing frequency. III The energy of a light wave increases with decreasing wavelength. $_{(VCAA 2020-modified)}$ A) III only. B) I and II only. C) I and III only. D) All of the statements are correct. Show Answer Correct Answer: D) All of the statements are correct. 14. Two waves with phase difference 180$^\circ$ have resultant of amplitude A) One. B) Zero. C) Same as the single wave. D) Doubles the single wave. Show Answer Correct Answer: B) Zero. 15. Select the correct order of waves on the EMS from the longest wavelength to the shortest wavelength A) Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma. B) Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio. C) Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio. D) Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma. Show Answer Correct Answer: A) Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma. 16. The angle of incidence is 35.9$^{o}$. Determine the angle of reflection. A) $35.9$. B) 35.9 Mathematical EquivalenceOFF. C) All the above. D) None of the above. Show Answer Correct Answer: A) $35.9$. 17. Regular disturbances that carry energy through matter or space A) Crest. B) Energy. C) Wave. D) Trough. Show Answer Correct Answer: C) Wave. 18. Waves are a transfer of A) Energy. B) Matter. C) All the above. D) None of the above. Show Answer Correct Answer: A) Energy. 19. What is the significance of Planck's law in black body radiation? A) Planck's law is a recent scientific discovery. B) Planck's law is only applicable to solid objects. C) Planck's law explains the behavior of white body radiation. D) Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium. Show Answer Correct Answer: D) Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium. 20. Which of these answers best describes a scientific theory? A) An explanation based on the opinion of a scientist. B) A description of a specific relationship under given conditions. C) A well-supported and widely accepted explanation of nature. D) A statement describing what always happens under certain conditions SHOW ANSWER. Show Answer Correct Answer: C) A well-supported and widely accepted explanation of nature. 21. When light enters a medium with a higher refractive index, it bends ..... the normal A) Towards. B) Away from. C) All the above. D) None of the above. Show Answer Correct Answer: A) Towards. 22. How does the temperature of a black body affect the wavelength of the emitted radiation? A) The wavelength of the emitted radiation decreases. B) The wavelength of the emitted radiation remains constant. C) The wavelength of the emitted radiation becomes negative. D) The wavelength of the emitted radiation increases. Show Answer Correct Answer: A) The wavelength of the emitted radiation decreases. 23. Decibles A) The unit to measure the intensity or power of sounds. B) A type of musical note. C) A measure of temperature. D) A unit for measuring distance. Show Answer Correct Answer: A) The unit to measure the intensity or power of sounds. 24. Which wave has the largest wavelength? A) X ray. B) Visible light. C) Radio. D) Gamma ray. Show Answer Correct Answer: C) Radio. 25. Bending of sound waves through openings A) Reflection. B) Refraction. C) Diffraction. D) Interference. Show Answer Correct Answer: C) Diffraction. ← PreviousNext →Related QuizzesClass 11 Physics (Part Ii) Chapter 17 Waves Quiz 1Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 2Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 3Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 4Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 5Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 6Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 7Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 8Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 9Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books