This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves – Quiz 44 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 44 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. As frequency increases, wavelength becomes bigger. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 2. How fast the wave is moving through a medium (a) A) A. wave speed. B) Wavelength. C) Amplitude. D) Frequency. Show Answer Correct Answer: A) A. wave speed. 3. Which one is a type of ionizing radiation? A) Radio waves. B) Microwaves. C) Gamma rays. D) Infrared. Show Answer Correct Answer: C) Gamma rays. 4. ..... is the device that uses electromagnetic waves to receive and transmit signals for communication. A) Refrigerator. B) Television. C) Mobile phone. D) Microwave. Show Answer Correct Answer: C) Mobile phone. 5. When an electron emits a photon of light, it also ..... A) Gains positive charge. B) Gains negative charge. C) Increases energy level. D) Decreases energy level. Show Answer Correct Answer: D) Decreases energy level. 6. Which scientist proved light acts like a wave by causing intereference patterns to form A) Einstein. B) Thomas Young. C) Alfred Michelson. D) Isaac Newton. Show Answer Correct Answer: B) Thomas Young. 7. This describes when the atoms of matter absorb light, and converts the light into thermal energy. A) Transmission. B) Reflection. C) Refraction. D) Absorption. Show Answer Correct Answer: D) Absorption. 8. In ..... waves, matter in the medium moves back and forth at right angles to the direction the wave travels. A) Longitudinal. B) Transverse. C) Sound. D) Light. Show Answer Correct Answer: B) Transverse. 9. Imagine this:Grace, Elijah, and Maya are having a debate. They are trying to figure out which type of electromagnetic wave can be seen with the unaided eye. Can you help them settle this debate? A) Radio waves. B) Microwaves. C) Visible light. D) Infrared rays. Show Answer Correct Answer: C) Visible light. 10. How far away is the wall if the echo takes 2 s to make a ROUND trip to come back to your ear and the speed of sound is 340 m/s? (HINT ..... only HALF of the time is needed to make the trip TO THE WALL ONLY!!!) ..... d=v*t A) 170 m. B) 340 m. C) 680 m. D) 342 m. Show Answer Correct Answer: B) 340 m. 11. System of satellites and ground monitoring stations that enable a receiver to determine its location at or above Earth's surface A) Global Positioning System. B) Carrier wave. C) Transceiver. D) Modulation. Show Answer Correct Answer: A) Global Positioning System. 12. What type of wave can travel through solids, liquids, and gases? A) Mechanical wave. B) Electromagnetic wave. C) Surface wave. D) Transverse wave. Show Answer Correct Answer: A) Mechanical wave. 13. Electromagnetic waves all have the same ..... and ..... A) Wavelength and speed. B) Speed and amplitude. C) Frequency and amplitude. D) Amplitude and wavelength. Show Answer Correct Answer: B) Speed and amplitude. 14. Blue and Yellow light combine to produce white light. This combination is known as A) Complementary colors. B) Secondary colors. C) Primary colors. D) Primary pigments. Show Answer Correct Answer: A) Complementary colors. 15. The lowest pitch that the average human can hear has a frequency of 20 Hz. If sound with this frequency travels through air with a speed of 400 m/s, what is its wavelength? A) 8000 m. B) 20 m. C) 200 m. D) 420 m. Show Answer Correct Answer: B) 20 m. 16. A scientist is planning to observe distant galaxies using electromagnetic waves that can pass through dust clouds in space. Which type of wave should the scientist use and why? A) Visible light, because it is easily detected by telescopes. B) Radio waves, because they can penetrate dust clouds. C) Ultraviolet rays, because they are blocked by Earth's atmosphere. D) X-rays, because they are absorbed by dust. Show Answer Correct Answer: B) Radio waves, because they can penetrate dust clouds. 17. As the wavelength of an electromagnetic wave gets LONGER, the frequency gets ..... A) Lower. B) Higher. C) Does not change. D) Doubles. Show Answer Correct Answer: A) Lower. 18. Dim blue light can knock electrons off the surface of metal, but bright red light cannot. Which of the following theories can explain why this occurs? A) Particle theory of light. B) Wave theory of light. C) Kinetic theory. D) Classical mechanics. Show Answer Correct Answer: A) Particle theory of light. 19. Which electromagnetic wave is used to diagnose and treat cancer? A) Gamma rays. B) Infrared rays. C) Ultraviolet rays. D) X-rays. Show Answer Correct Answer: A) Gamma rays. 20. Which of the following statements best explains why lightning is seen before thunder is heard? A) Electromagnetic waves travel faster than mechanicalwaves in air. B) Electromagnetic waves have a higher frequencythan mechanical waves. C) Electromagnetic waves experience less interferencethan mechanical waves. D) Electromagnetic waves form faster than mechanicalwaves during a thunderstorm. Show Answer Correct Answer: A) Electromagnetic waves travel faster than mechanicalwaves in air. 21. Which type of electromagnetic wave is primarily used in medical imaging to view the inside of the human body? A) Ultraviolet rays. B) X-rays. C) Microwaves. D) Gamma rays. Show Answer Correct Answer: B) X-rays. 22. What is the role of electromagnetic waves in the greenhouse effect? A) Greenhouse gases block all electromagnetic waves from entering the atmosphere. B) Electromagnetic waves have no impact on temperature regulation in the atmosphere. C) Electromagnetic waves, especially infrared radiation, are absorbed and re-emitted by greenhouse gases, trapping heat in the atmosphere. D) Electromagnetic waves cool the Earth's surface by reflecting sunlight. Show Answer Correct Answer: C) Electromagnetic waves, especially infrared radiation, are absorbed and re-emitted by greenhouse gases, trapping heat in the atmosphere. 23. How does changing the wavelength affect a light wave? A) It changes the volume. B) It changes the intensity. C) It changes the the type of wave. D) It doesn't change anything. Show Answer Correct Answer: C) It changes the the type of wave. 24. The ratio of the electric field to the magnetic field in an EM wave equals the speed of light. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 25. Electromagnetic waves with enough energy to penetrate skin and muscle, but not lead are known as ..... A) Visible light. B) Infrared. C) X rays. D) Gamma rays. Show Answer Correct Answer: C) X rays. ← 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