This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves – Quiz 39 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 39 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Shortwave radio is broadcast between 3.50 and 29.7 MHz. To what range ofwavelengths does this correspond?c= 3.00 x 10$^{8}$ m/s. $\lambda=\frac{c}{f}$ A) 86 m / 12 m. B) 85.7 m / 10.1 m. C) 84 m / 10.1 m. D) 88 m / 12 m. Show Answer Correct Answer: B) 85.7 m / 10.1 m. 2. Which waves are used to show heat loss with heat sensitive cameras? A) Infrared radiation. B) Ultraviolet radiation. C) Microwaves. D) Gamma rays. Show Answer Correct Answer: A) Infrared radiation. 3. In the spectrum diagram, wavelength decreases from left to right. What happens to frequency as you move from radio waves to gamma rays? A) Frequency decreases to the lowest values. B) Frequency changes randomly without a pattern. C) Frequency increases to higher values. D) Frequency stays the same across the spectrum. Show Answer Correct Answer: C) Frequency increases to higher values. 4. Large wavelength = A) Small frequency. B) Large frequency. C) All the above. D) None of the above. Show Answer Correct Answer: A) Small frequency. 5. Wavelength = 3m Frequency = 6 HzSpeed =? A) 2 m/s. B) 18 m/s. C) 9 m/s. D) 1/2 m/s. Show Answer Correct Answer: B) 18 m/s. 6. Which of the following is correctly arranged from longest to shortest wavelength? A) Gamma ray, radio wave, infrared. B) Microwave, x-ray, gamma ray. C) Ultraviolet, visible light, radio wave. D) X-ray, gamma ray, ultraviolet. Show Answer Correct Answer: B) Microwave, x-ray, gamma ray. 7. Do all electromagnetic waves travel at the same speed? A) No, the waves travel at different speeds. B) No, the speeds of electromagnetic waves constantly change. C) Yes, the speeds of electromagnetic waves differ. D) Yes, all electromagnetic waves travel at the same speed. Show Answer Correct Answer: D) Yes, all electromagnetic waves travel at the same speed. 8. Light is emitted when electrons A) Move from one atom to another. B) Collide with one another, releasing energy. C) Move from a lower energy level to a higher energy level. D) Move from a higher energy level to a lower energy level. Show Answer Correct Answer: D) Move from a higher energy level to a lower energy level. 9. Which type of electromagnetic wave is commonly used in microwave ovens? A) Radio waves. B) Microwaves. C) Infrared waves. D) Ultraviolet waves. Show Answer Correct Answer: B) Microwaves. 10. How does melanin provide protection against skin cancer? A) Melanin reflects all types of light. B) Melanin transmits harmful lightwaves before they reach the genetic material. C) Melanin absorbs harmful lightwaves before they reach the genetic material. D) Melanin does not provide protection against skin cancer. Show Answer Correct Answer: C) Melanin absorbs harmful lightwaves before they reach the genetic material. 11. Which color of light is produced when all of the colors of visible light in the electromagnetic spectrum are combined? A) Gray. B) White. C) Black. D) None of the above. Show Answer Correct Answer: B) White. 12. Describe the electromagnetic spectrum and its components. A) The electromagnetic spectrum consists of radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. B) Sound waves, light waves, and heat waves. C) Radio waves, sound waves, and thermal radiation. D) Only visible light and infrared radiation. Show Answer Correct Answer: A) The electromagnetic spectrum consists of radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. 13. A(n) ..... is the substance or matter through which waves pass. A) Medium. B) Compression. C) Rarefaction. D) Hertz. Show Answer Correct Answer: A) Medium. 14. The light we can see. A) Visible. B) Gamma. C) Ultraviolet. D) None of the above. Show Answer Correct Answer: A) Visible. 15. A sound wave needs a medium to travel (to be transmitted) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. What type of electromagnetic wave is used in MRI machines to create detailed images of organs and tissues? A) Radio waves. B) X-rays. C) Ultrasound. D) Infrared waves. Show Answer Correct Answer: A) Radio waves. 17. The formula for time period of a wave is ..... A) T=1/v. B) T= 1/c. C) T= 1/f. D) None of these. Show Answer Correct Answer: C) T= 1/f. 18. Longer wavelengths are associated with A) Lower energy. B) Higher energy. C) Zero energy. D) All of these. Show Answer Correct Answer: A) Lower energy. 19. Which type of radio broadcast has a greater broadcast range? A) AM radio waves. B) FM radio waves. C) Visible light. D) Infrared waves. Show Answer Correct Answer: A) AM radio waves. 20. Unlike a transverse wave, the disturbance in a longitudinal wave is A) In a circular motion. B) Parallel to the wave motion. C) Perpendicular to the wave motion. D) In the opposite direction of the wave motion. Show Answer Correct Answer: B) Parallel to the wave motion. 21. Red light has ..... wavelength than green light. A) Lower. B) Greater. C) Same. D) None of the above. Show Answer Correct Answer: B) Greater. 22. Which electromagnetic waves are used in fiber optic communication? A) Radio waves. B) Microwaves. C) Visible light. D) Ultraviolet waves. Show Answer Correct Answer: C) Visible light. 23. Electromagnetic waves with longest wavelengths and lowest frequencies are A) Gamma waves. B) Radio waves. C) Microwaves. D) Thermowaves. Show Answer Correct Answer: B) Radio waves. 24. When an incident ray strikes a particle, it is scattered. Which of the following conditions must be met for scattering of light to happen? A) The diameter of the particle must be greater than the wavelength of the ray. B) The wavelength of the ray and the velocity of the particle must be the same. C) It should be either sunrise or sunset. D) None of the above. Show Answer Correct Answer: A) The diameter of the particle must be greater than the wavelength of the ray. 25. Which phenomenon explains the bending of light as it passes through different media? A) Reflection. B) Refraction. C) Diffraction. D) Dispersion. Show Answer Correct Answer: B) Refraction. ← PreviousNext →Related QuizzesClass 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 1Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 2Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 3Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 4Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 5Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 6Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 7Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 8Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 9Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books