This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What are two common uses of infrared radiation? A) Cooking food and sterilizing equipment. B) Night vision goggles and remote controls. C) Transmitting internet signals and generating electricity. D) Heating homes and powering vehicles. Show Answer Correct Answer: B) Night vision goggles and remote controls. 2. Electromagnetic waves are propagated by electric and magnetic fields oscillating at right angle to each other. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. Electromagnetic waves travel at the same speed in a vacuum, known as the speed of light. A) 350, 000. B) 500, 000. C) 400, 000. D) 300, 000. Show Answer Correct Answer: D) 300, 000. 4. Which of the following is used in fibre optics ..... A) Visible light. B) X-rays. C) Radio waves. D) None. Show Answer Correct Answer: A) Visible light. 5. Is it possible to change the speed of light? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 6. The number of waves that pass a point in a given amount of time, measured in hertz. A) Frequency. B) Wavelength. C) Amplitude. D) Medium. Show Answer Correct Answer: A) Frequency. 7. Electromagnetic waves are composed of ..... and ..... energy, allowing the wave to move in a ..... (like outer space). A) Electric and magnetic energy, allowing the wave to move in a vacuum. B) Electric and gravitational energy, allowing the wave to move in a medium. C) Magnetic and thermal energy, allowing the wave to move in a solid. D) Nuclear and chemical energy, allowing the wave to move in a liquid. Show Answer Correct Answer: A) Electric and magnetic energy, allowing the wave to move in a vacuum. 8. Which type of EM waves has the highest frequency? A) Microwaves. B) Radio waves. C) X-rays. D) Gamma rays. Show Answer Correct Answer: D) Gamma rays. 9. Ultraviolet light is associated with A) Lung cancer. B) Producing vitamin D. C) Human vision. D) Communication. Show Answer Correct Answer: B) Producing vitamin D. 10. What harmful effect can the sun have for life on Earth? A) Increasing green energy with solar panels and wind turbines. B) Vitamin D deficiency and bone loss. C) Plants and animals dying by dehydration. D) Ultraviolet radiation causes skin damage, leading to skin cancer. Show Answer Correct Answer: D) Ultraviolet radiation causes skin damage, leading to skin cancer. 11. Cell phones do not cause cancer because they lack enough A) Radio Frequency Energy. B) Photons. C) Frequency. D) Momentum. Show Answer Correct Answer: A) Radio Frequency Energy. 12. Through which of these mediums does a sound wave travel through the easiest? A) Gas. B) Liquid. C) Solid. D) None of the above. Show Answer Correct Answer: C) Solid. 13. What does a lamp give off? A) Sound. B) Light. C) Nuclear energy. D) None of the above. Show Answer Correct Answer: B) Light. 14. ..... is the use of electromagnetic waves to send information in all directions. A) Broadcasting. B) X-ray. C) Carrier wave. D) Amplitude. Show Answer Correct Answer: A) Broadcasting. 15. How are fiber optics used in communication? A) By using light waves to transmit data through glass fibers. B) By using microwaves to transmit data through air. C) By using X-rays to transmit data through metal wires. D) By using sound waves to transmit data. Show Answer Correct Answer: A) By using light waves to transmit data through glass fibers. 16. Which of the following electromagnetic waves has the lowest energy? A) Gamma ray. B) Microwave. C) Visible light wave. D) Infrared wave. Show Answer Correct Answer: B) Microwave. 17. What word describes the number of waves that pass a certain point in a given amount of time? A) Amplitude. B) Resonance. C) Frequency. D) Wavelength. Show Answer Correct Answer: C) Frequency. 18. Bone fracture can be detected by using ..... A) Gamma rays. B) X-ray. C) Light ray. D) All the above. Show Answer Correct Answer: B) X-ray. 19. Which statement best describes a property or use of gamma rays? A) They have smallest wavelength and highest frequency. B) They are safe for skin and reduce cancer risk. C) They are used to heat food in household ovens. D) They reflect off clouds to create visible rainbows. Show Answer Correct Answer: A) They have smallest wavelength and highest frequency. 20. The range of all forms of radiant energy is called the A) Color spectrum. B) Video spectrum. C) Electromagnetic spectrum. D) Audio spectrum. Show Answer Correct Answer: C) Electromagnetic spectrum. 21. Which type of radio waves has a higher frequency:AM or FM? A) AM. B) FM. C) All the above. D) None of the above. Show Answer Correct Answer: A) AM. 22. What is the type of modulation achieved by varying the frequency of a carrier wave while keeping the amplitude constant? A) Digital Modulation (DM). B) Phase Modulation (PM). C) Frequency Modulation (FM). D) Amplitude Modulation (AM). Show Answer Correct Answer: C) Frequency Modulation (FM). 23. Speed of electromagnetic waves in vacuum is A) 3 x 10$^{8}$ m/s. B) 4 x 10$^{8}$ m/s. C) 2 x 10$^{8}$ m/s. D) None. Show Answer Correct Answer: A) 3 x 10$^{8}$ m/s. 24. An EM wave only travels in one directions. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 25. What is the frequency range of ultraviolet radiation? A) 3.5x1011-3x1014 Hz. B) 7.5x1016-3x1019 Hz. C) 3.5x109-3x1011 Hz. D) 7.5x1014-3x1016 Hz. Show Answer Correct Answer: D) 7.5x1014-3x1016 Hz. 26. Based on Maxwell's starting points*Magnetic fields are generated: A) By moving charges or currents. B) By still charges. C) By chemical reactions. D) By summer and hot weather. Show Answer Correct Answer: A) By moving charges or currents. 27. Given images of three galaxies-one with a disk and arms, one that is round and smooth, and one with no clear shape-how would you categorize each galaxy type? A) Irregular, Spiral, Elliptical. B) Elliptical, Irregular, Spiral. C) Spiral, Irregular, Elliptical. D) Spiral, Elliptical, Irregular. Show Answer Correct Answer: D) Spiral, Elliptical, Irregular. 28. True or false? Warm objects emit radiation, but cool objects do not. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 29. Which part of the electromagnetic spectrum is used in night vision goggles? A) Visible light. B) Ultraviolet. C) Microwave. D) Infrared. Show Answer Correct Answer: D) Infrared. 30. A wave is a disturbance that transfers energy. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 31. The magnetic and electric fields ..... A) Create each other only once. B) Create each other again and again. C) All the above. D) None of the above. Show Answer Correct Answer: B) Create each other again and again. 32. When on a flat surface, giving the Slinky$^{\textregistered}$ a push or pulse will create a disturbance A) In the opposite direction of the wave motion. B) Parallel to the wave motion. C) In a circle. D) Perpendicular to the wave motion. Show Answer Correct Answer: B) Parallel to the wave motion. 33. Speed of electromagnetic waves is highest in ..... A) Solids. B) Water. C) Air. D) Vacuum. Show Answer Correct Answer: D) Vacuum. 34. Frequency = 9.25x10$^{25}$ HzWavelength =? A) 3.24E-18. B) 2.77E+34. C) 3.09E+17. D) 6.13E-08. Show Answer Correct Answer: A) 3.24E-18. 35. ..... carry the greatest amount of energy. A) Visible light. B) Gamma rays. C) Infrared rays. D) X-rays. Show Answer Correct Answer: B) Gamma rays. 36. All electromagnetic waves travel at the speed of light. Is this statement true or false? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 37. EM waves consist of changing electric and magnetic fields moving perpendicular with respect to each other. What kind of wave is it? A) Transverse waves. B) Compressional waves. C) Longitudinal waves. D) Mechanical waves. Show Answer Correct Answer: A) Transverse waves. 38. Light bouncing off of an object: A) Rarefraction. B) Diffraction. C) Reflection. D) Refraction. Show Answer Correct Answer: C) Reflection. 39. Infrared rays are important for A) Warming the Earth. B) Providing visible light for plants. C) Taking X-rays. D) All of these. Show Answer Correct Answer: A) Warming the Earth. 40. The area of a longitudinal wave where particles are pushed close together are called: A) Compressions. B) Amplitude. C) Rarefactions. D) Wavelength. Show Answer Correct Answer: A) Compressions. 41. What type of wave is responsible for the transfer of electric and magnetic energy through the vacuum of space? A) Visible light. B) Microwaves. C) Electromagnetic waves. D) Radio waves. Show Answer Correct Answer: C) Electromagnetic waves. 42. When using scientific notation, a positive exponent means ..... A) The standard number is greater than one. B) The standard number is less than one. C) The negative sign doesn't have a meaning. D) None of the above. Show Answer Correct Answer: A) The standard number is greater than one. 43. Which application relies on gamma rays? A) Cancer treatments that kill of cancer cells. B) Bluetooth phone connections. C) X ray imaging. D) GPS mapping city streets. Show Answer Correct Answer: A) Cancer treatments that kill of cancer cells. 44. What is the fourth highest electromagnetic wave on the electromagnetic spectrum? A) Visible Light. B) Ultraviolet. C) Infrared. D) Microwave. Show Answer Correct Answer: A) Visible Light. 45. A thermogram identifies the warm and cool parts of an object by using ..... A) Visible light. B) Infrared rays. C) Radio waves. D) Ultraviolet rays. Show Answer Correct Answer: B) Infrared rays. 46. What is the frequency that human eye can detect on EM? A) Radio waves. B) Visible light. C) X-rays. D) Ultraviolet rays. Show Answer Correct Answer: B) Visible light. 47. They are materials that do not transmit any light. A) Transparent. B) Opaque. C) Translucent. D) Reflective. Show Answer Correct Answer: B) Opaque. 48. X-ray photographs show softer tissues ..... A) As dark, highly exposed areas. B) The same as dense bones. C) As invisible. D) As bright white areas. Show Answer Correct Answer: A) As dark, highly exposed areas. 49. Wave with the longest wavelength A) Gamma. B) Microwave. C) Radio. D) Visible light. Show Answer Correct Answer: C) Radio. 50. Which type of electromagnetic wave is most harmful to human skin? A) Visible light. B) Radio waves. C) Ultraviolet light. D) Infrared radiation. Show Answer Correct Answer: C) Ultraviolet light. 51. Which electromagnetic waves are useful for Television? A) Radio. B) Gamma. C) X ray. D) Microwave. Show Answer Correct Answer: A) Radio. 52. Radar uses which type of electromagnetic waves to detect objects & measure their distance and speed? A) Microwaves. B) Infrared rays. C) X-rays. D) None of the above. Show Answer Correct Answer: A) Microwaves. 53. Polarized sunglasses work by A) Blocking light waves that vibrate in one plane. B) Gradually refracting light as it passes through the lenses. C) Bending light as it passes from air into the lenses. D) Reflecting most of the light that strikes the sunglasses. Show Answer Correct Answer: A) Blocking light waves that vibrate in one plane. 54. Microwaves are ..... with wavelengths less than 30 cm and higher frequency & shorter wavelength. A) Computer sounds. B) Sound waves. C) Radio waves. D) Hand signals. Show Answer Correct Answer: C) Radio waves. 55. What type of electromagnetic wave is used in fiber optic communications? A) Microwaves. B) Radio waves. C) Infrared waves. D) Ultraviolet waves. Show Answer Correct Answer: C) Infrared waves. 56. The electric and magnetic fields vibrate at right angles to the direction the wave travels so it is a transverse wave. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 57. Electromagnetic waves are examples of A) Transverse waves. B) Mechanical waves. C) Ocean waves. D) Longitudinal waves. Show Answer Correct Answer: A) Transverse waves. 58. Sunscreen protects you from sunburns. What type of electromagnetic wave causes sunburns? A) Ultraviolet. B) Infared. C) Gamma. D) Visible Light. Show Answer Correct Answer: A) Ultraviolet. 59. Which type of electromagnetic radiation is used extensively in communications? A) Radio waves. B) X-rays. C) Infrared rays. D) Gamma rays. Show Answer Correct Answer: A) Radio waves. 60. A black shirt will look black to our eyes because ..... A) All the visible light colors are being absorbed and nothing is being reflected back to our eyes. B) Black is the only color absorbed by the shirt. C) All the above. D) None of the above. Show Answer Correct Answer: A) All the visible light colors are being absorbed and nothing is being reflected back to our eyes. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 7Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 8Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books