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 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes must be placed in orbit around Earth in order to observe short-wavelength radiation? A) Radio telescopes. B) Visible-light telescopes. C) Gamma-ray telescopes. D) Infrared telescopes. Show Answer Correct Answer: C) Gamma-ray telescopes. 2. Convert this number into scientific notation:950, 000 A) 9.5 x 10$^{5}$. B) 9.5 x 10$^{-9}$. C) 9.5 x 10$^{2}$. D) None of the above. Show Answer Correct Answer: A) 9.5 x 10$^{5}$. 3. White light is the entire range of A) Colorsof visible light combined. B) Ultravioletlight. C) Gammarays and X rays. D) EMwaves. Show Answer Correct Answer: A) Colorsof visible light combined. 4. The wave equation is ..... A) V = f $\lambda$. B) $\lambda$ = v / f. C) F = v / $\lambda$. D) All of them. Show Answer Correct Answer: A) V = f $\lambda$. 5. How are infrared waves classified? A) Hot and cold infrared. B) Visible and invisible infrared. C) Near and far infrared. D) Short and long infrared. Show Answer Correct Answer: C) Near and far infrared. 6. The electromagnetic waves with the highest frequencies are called A) Gamma rays. B) Radio waves. C) Visible light. D) X-rays. Show Answer Correct Answer: A) Gamma rays. 7. Which of the following electromagnetic waves travels the fastest? A) Gamma rays. B) Radio waves. C) Ultraviolet waves. D) They all travel the same speed. Show Answer Correct Answer: D) They all travel the same speed. 8. Which of the following is not an application of microwaves? A) Cellphone. B) Microwave oven. C) Radio. D) Radar. Show Answer Correct Answer: C) Radio. 9. What are electromagnetic waves grouped by? A) Their function. B) Wavelength and frequency. C) Wavelength. D) Frequency. Show Answer Correct Answer: B) Wavelength and frequency. 10. Describe how the energy level changes from gamma rays to radio waves. A) Increases. B) Cannot be determined. C) Remain the same. D) Decreases. Show Answer Correct Answer: D) Decreases. 11. What happens when electric and magnetic fields change? A) A changing magnetic field creates the same electric field. B) A changing magnetic field creates a changing electric field. C) A changing magnetic field creates a burning fire field. D) None of the above. Show Answer Correct Answer: B) A changing magnetic field creates a changing electric field. 12. ..... waves have the highest frequency among electromagnetic waves. A) X-rays. B) Microwaves. C) Ultraviolet rays. D) Gamma rays. Show Answer Correct Answer: D) Gamma rays. 13. During a concert, how does the sound from the instruments reach the audience? A) Through the air as a medium. B) Sound is unrelated to the vibrations of the instruments. C) Sound cannot travel through the concert hall's atmosphere. D) Sound can travel even in the vacuum of space. Show Answer Correct Answer: A) Through the air as a medium. 14. An electromagnetic consists of an electric field and a magnetic field. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 15. Which electromagnetic wave is used in medical imaging to view bones? A) X-ray. B) Ultraviolet wave. C) Visible light. D) Gamma ray. Show Answer Correct Answer: A) X-ray. 16. What is the nature of light? A) Particle. B) Wave. C) Both particle and wave. D) None of the above. Show Answer Correct Answer: C) Both particle and wave. 17. A prism splits white light into 7 constituent colours. In what order does this process take place? A) Refraction when white light enters the prism and dispersion when it exits the prism. B) Dispersion when the light enters the prism and refraction when it exits the prism. C) Both refraction and dispersion happen at both points-entry and exit of light from the prism. D) None of the above. Show Answer Correct Answer: B) Dispersion when the light enters the prism and refraction when it exits the prism. 18. The color most closely associated with a high frequency A) Orange. B) Red. C) Blue. D) Yellow. Show Answer Correct Answer: C) Blue. 19. Rattlesnakes need to catch preys at night. What type of waves would their eyes need to see? A) Infrared light. B) Gamma rays. C) Visible light. D) Radio waves. Show Answer Correct Answer: A) Infrared light. 20. Which of the following is a use of microwaves? A) Power generation. B) Water purification. C) Remote controls. D) Bluetooth headsets. Show Answer Correct Answer: D) Bluetooth headsets. 21. Which type of electromagnetic wave is used in MRI (Magnetic Resonance Imaging) machines? A) X-rays. B) Microwaves. C) Gamma rays. D) Radio waves. Show Answer Correct Answer: D) Radio waves. 22. Which of the following best describes X-rays? A) Used by medical professionals to "see" inside the body. B) Used to broadcast television signals. C) Used in tanning beds. D) Widely used in the cooking industry. Show Answer Correct Answer: A) Used by medical professionals to "see" inside the body. 23. Which statement best describes how electromagnetic waves move through space? A) They can travel through a vacuum without a medium. B) They require a solid medium to travel. C) They need air as their only medium. D) They stop completely in empty space. Show Answer Correct Answer: A) They can travel through a vacuum without a medium. 24. The ..... of an electromagnetic wave determines its color in the visible spectrum. A) Amplitude. B) Wavelength. C) Frequency. D) Speed. Show Answer Correct Answer: C) Frequency. 25. The number of waves passing a given point each second is: A) Wavelength. B) Amplitude. C) Frequency. D) Wave speed. Show Answer Correct Answer: C) Frequency. 26. Which electromagnetic radiation has the highest penatrating ability and is emitted only during high-energy nuclear reaction? A) Gamma rays. B) Microwave radiation. C) X-rays. D) Radio waves. Show Answer Correct Answer: A) Gamma rays. 27. Some radar systems detect the size and shape of objects such as aircraft and geological terrain. Approximately what is the smallest observable detail utilizing 500-MHz radar? A) $60.0$. B) $6.0$. C) $6.0\times10^{-2}$. D) $0.6$. Show Answer Correct Answer: D) $0.6$. 28. Electromagnet waves transfer ..... without matter. A) Information. B) Energy. C) Medium. D) X rays. Show Answer Correct Answer: B) Energy. 29. Select the correct order of waves on the Electromagnetic Spectrum A) Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma. B) Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma. C) Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio. D) Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio. Show Answer Correct Answer: B) Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma. 30. What is the fourth lowest electromagnetic wave on the electromagnetic spectrum? A) Microwave. B) Infrared. C) Visible light. D) Ultraviolet. Show Answer Correct Answer: B) Infrared. 31. This type of electromagnetic wave can be used to see inside luggage at an airport or in hospitals to see your bones. A) Gamma Rays. B) X Rays. C) Infrared Rays. D) Visible Light. Show Answer Correct Answer: B) X Rays. 32. Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation? A) Microwave. B) X-rays. C) Infrared. D) Ultraviolet. Show Answer Correct Answer: C) Infrared. 33. The magnetic and electric fields create each other again and again. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 34. What is the relationship between wavelength and frequency in the electromagnetic spectrum? A) They are unrelated. B) They are inversely proportional. C) They are directly proportional. D) They are equal. Show Answer Correct Answer: B) They are inversely proportional. 35. Which type of waves are used in energy efficient bulbs? A) X-ray. B) Ultraviolet. C) Microwave. D) Infrared. Show Answer Correct Answer: B) Ultraviolet. 36. Electromagnetic wave with a wavelength longer than about 10 cm, used for communication A) Radio wave. B) Infrared wave. C) Analog signal. D) Microwave. Show Answer Correct Answer: A) Radio wave. 37. Electromagnetic waves with the highest frequency are x-rays A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 38. Maxwell guessed that visible light was an electromagnetic wave because of its ..... A) Energy. B) Wavelength. C) Frequency. D) Speed. Show Answer Correct Answer: D) Speed. 39. Does time stop at the Speed of Light? A) Yes, because when you speed up mass decreases. B) No, because its not possible!. C) Yes, because the faster you move in space, the slower you move in time. D) No, because time is nothing in space. Show Answer Correct Answer: C) Yes, because the faster you move in space, the slower you move in time. 40. Light waves that vibrate in only one plane is polarized light. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 41. When a charged particle moves, it produces a A) Field of gravity. B) Black hole. C) Magnetic field. D) Supernova. Show Answer Correct Answer: C) Magnetic field. 42. Waves can be used to examine internal body parts are ..... A) Radio waves. B) Visible light. C) Ultraviolet. D) X-rays. Show Answer Correct Answer: D) X-rays. 43. Which form of electromagnetic energy is so powerful that it can penetrate concrete and metal as well as being used to kill cancerous cells in the human body? A) Ultraviolet rays. B) Gamma rays. C) Microwaves. D) Radio waves. Show Answer Correct Answer: B) Gamma rays. 44. Sound waves are (a) waves. A) A. mechanical. B) Electromagnetic. C) All the above. D) None of the above. Show Answer Correct Answer: A) A. mechanical. 45. What tools are needed to measure the speed of light? A) A pencil, glass of water, and oil or sugar. B) A light source, a mirror, and vacuum. C) Lanterns and a smart mind!. D) A light source, a mirror, and a gear wheel, and an observer. Show Answer Correct Answer: D) A light source, a mirror, and a gear wheel, and an observer. 46. Describe how lasers utilize the principles of polarization. A) Lasers emit polarized light by aligning the electric field vectors of photons, using optical components to control polarization. B) Lasers produce unpolarized light by scattering photons randomly. C) Lasers emit light in all directions without any polarization control. D) Lasers use polarization to amplify sound waves instead of light. Show Answer Correct Answer: A) Lasers emit polarized light by aligning the electric field vectors of photons, using optical components to control polarization. 47. Electromagnetic waves travel at a constant velocity of 3 x 10$^{8 }$m/s in a vacuum. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 48. The EM wave with frequency higher than infrared and lower than UV. A) Radio. B) Xray. C) Gamma. D) Visible light. Show Answer Correct Answer: D) Visible light. 49. Identify the fields produced by a moving charged particle. A) Both an electric field and a magnetic field will be produced. B) Neither a magnetic field nor an electric field will be produced. C) A magnetic field, but no electric field will be produced. D) Only the electric field, but no magnetic field will be produced. Show Answer Correct Answer: A) Both an electric field and a magnetic field will be produced. 50. Electromagnetic wave with a wavelength between about 10 billionths of a meter and 10 trillionths of a meter, often used for medical imaging A) Ultraviolet waves. B) Visible light. C) X-ray. D) Gamma ray. Show Answer Correct Answer: C) X-ray. 51. What do far infrared waves give off? A) Light. B) Sound. C) Cold. D) Heat. Show Answer Correct Answer: D) Heat. 52. Which of the following waves are used in medical imaging and treatment ..... A) X-rays. B) Infrared light. C) Radio waves. D) Micro waves. Show Answer Correct Answer: A) X-rays. 53. When an electron moves from an excited state back to its normal energy level, it creates a disturbance in the magnetic field around it and makes what? (Vocab) A) Permanent Magnet. B) Electromagnet. C) Gravity Wave. D) Electric Motor. E) Electromagnetic Wave. Show Answer Correct Answer: E) Electromagnetic Wave. 54. The entire range of the electromagnetic wave frequencies is known as ..... A) The electromagnetic spectrum. B) Visible light. C) Magnetism. D) Ultraviolet radiation. Show Answer Correct Answer: A) The electromagnetic spectrum. 55. Which of the following experiments demonstrated the wave nature of electromagnetic radiation? A) Rutherford's gold foil experiment. B) Thomson's cathode ray experiment. C) Millikan's oil drop experiment. D) Young's double-slit experiment. Show Answer Correct Answer: D) Young's double-slit experiment. 56. Identify the fields that make up an electromagnetic wave. A) Both an electric field and a magnetic field. B) Neither a magnetic field nor an electric field. C) Only a magnetic field, but no electric field. D) Only an electric field, but no magnetic field. Show Answer Correct Answer: A) Both an electric field and a magnetic field. 57. In order of the light transmitting capabilities of materials from none to all, which is the correct sequence? A) Translucent, transparent, opaque. B) Opaque, transparent, translucent. C) Opaque, translucent, transparent. D) Transparent, opaque, translucent. Show Answer Correct Answer: C) Opaque, translucent, transparent. 58. Which of these mediums does light travel through the easiest? A) Gas. B) Liquid. C) Solid. D) None of the above. Show Answer Correct Answer: A) Gas. 59. The measure from crest to crest OR trough to trough is the ..... A) Wavelength. B) Rest. C) Amplitude. D) Frequency. Show Answer Correct Answer: A) Wavelength. 60. ..... contributes primarily to greenhouse effect. Other greenhouse gases include methane, nitrous oxide, fluorinated gases, etc. A) Oxygen. B) Carbon dioxide. C) Sunlight. D) Hydrogen. Show Answer Correct Answer: B) Carbon dioxide. ← 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 6Class 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