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 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 18 (24 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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) Infrared rays. B) Radio waves. C) Visible light. D) Microwaves. Show Answer Correct Answer: C) Visible light. 2. 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) 680 m. B) 170 m. C) 342 m. D) 340 m. Show Answer Correct Answer: D) 340 m. 3. System of satellites and ground monitoring stations that enable a receiver to determine its location at or above Earth's surface A) Modulation. B) Transceiver. C) Global Positioning System. D) Carrier wave. Show Answer Correct Answer: C) Global Positioning System. 4. What type of wave can travel through solids, liquids, and gases? A) Mechanical wave. B) Transverse wave. C) Electromagnetic wave. D) Surface wave. Show Answer Correct Answer: A) Mechanical wave. 5. Blue and Yellow light combine to produce white light. This combination is known as A) Primary pigments. B) Primary colors. C) Secondary colors. D) Complementary colors. Show Answer Correct Answer: D) Complementary colors. 6. 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) 20 m. B) 420 m. C) 8000 m. D) 200 m. Show Answer Correct Answer: A) 20 m. 7. 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) X-rays, because they are absorbed by dust. B) Radio waves, because they can penetrate dust clouds. C) Ultraviolet rays, because they are blocked by Earth's atmosphere. D) Visible light, because it is easily detected by telescopes. Show Answer Correct Answer: B) Radio waves, because they can penetrate dust clouds. 8. As the wavelength of an electromagnetic wave gets LONGER, the frequency gets ..... A) Doubles. B) Higher. C) Lower. D) Does not change. Show Answer Correct Answer: C) Lower. 9. 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) Kinetic theory. B) Classical mechanics. C) Wave theory of light. D) Particle theory of light. Show Answer Correct Answer: D) Particle theory of light. 10. Which electromagnetic wave is used to diagnose and treat cancer? A) X-rays. B) Gamma rays. C) Ultraviolet rays. D) Infrared rays. Show Answer Correct Answer: B) Gamma rays. 11. Which of the following statements best explains why lightning is seen before thunder is heard? A) Electromagnetic waves have a higher frequencythan mechanical waves. B) Electromagnetic waves experience less interferencethan mechanical waves. C) Electromagnetic waves travel faster than mechanicalwaves in air. D) Electromagnetic waves form faster than mechanicalwaves during a thunderstorm. Show Answer Correct Answer: C) Electromagnetic waves travel faster than mechanicalwaves in air. 12. 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. 13. How does changing the wavelength affect a light wave? A) It doesn't change anything. B) It changes the intensity. C) It changes the the type of wave. D) It changes the volume. Show Answer Correct Answer: C) It changes the the type of wave. 14. 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. 15. Electromagnetic waves with enough energy to penetrate skin and muscle, but not lead are known as ..... A) X rays. B) Visible light. C) Gamma rays. D) Infrared. Show Answer Correct Answer: A) X rays. 16. What is the celestial sphere? A) An imaginary transparent grid in the sky at night. B) An imaginary transparent grid on Earth's surface. C) An imaginary transparent grid outside the solar system. D) Earth's Southern Hemisphere. Show Answer Correct Answer: A) An imaginary transparent grid in the sky at night. 17. Xrays and Gamma Rays have the highest frequencies, therefore, highest energies. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 18. The highest point on a transverse wave is called the ..... A) Wavelength. B) Crest. C) Trough. D) Amplitude. Show Answer Correct Answer: B) Crest. 19. While studying the nature of waves during a physics class, a student wonders how to distinguish between electromagnetic and mechanical waves. Which question should the student ask to determine the type of wave? A) Does it require a medium in order to travel?. B) Can it pass through air and water?. C) Does it have a measurable speed?. D) Does it have a measurable frequency?. Show Answer Correct Answer: A) Does it require a medium in order to travel?. 20. At a rock concert, which type of wave allows the crowd to see the vibrations of the guitar strings as they're played, with the wave motion perpendicular to the direction of the disturbance? A) Mechanical. B) Surface. C) Transverse. D) Longitudinal. Show Answer Correct Answer: C) Transverse. 21. Which type of galaxy has no definite shape and appears disorganized? A) Lenticular. B) Elliptical. C) Spiral. D) Irregular. Show Answer Correct Answer: D) Irregular. 22. What is the description for radio waves? A) Have the least amount of energy. B) Allows for night vision. C) See broken bones. D) Kills cancer cells. Show Answer Correct Answer: A) Have the least amount of energy. 23. Of the various types of electromagnetic radiation, which is the most penetrating through all forms of matter? A) Visible light. B) Infrared. C) Ultraviolet. D) Gamma. Show Answer Correct Answer: D) Gamma. 24. A form of electromagnetic radiation that doesn't require a medium to pass through A) Compressional wave. B) Sound wave. C) Transverse wave. D) Light wave. Show Answer Correct Answer: D) Light wave. ← PreviousRelated 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 7Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books