This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves – Quiz 29 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 29 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In microwave ovens, a ..... causes water molecules to rotate billions of times per second causing friction, creating TE which heats the food. A) Vibrating electric field. B) Vibrating magnetic field. C) All the above. D) None of the above. Show Answer Correct Answer: A) Vibrating electric field. 2. What is the resulting direction of a surface wave? A) Parallel. B) Circular. C) Opposite. D) Perpendicular. Show Answer Correct Answer: B) Circular. 3. The distance from one crest to another crest is called a ..... A) Wave period. B) Wavelenght. C) Lambada. D) None of these. Show Answer Correct Answer: B) Wavelenght. 4. A ship anchored at sea is rocked by waves that have crests 14 m apart. The waves travel at 7.0 m/s. At what frequency do the waves reach the ship? A) 21 Hz. B) 7 Hz. C) 2 Hz. D) 0.5 Hz. Show Answer Correct Answer: D) 0.5 Hz. 5. A disturbance in magnetic and electric fields produces light waves. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. Among the given EM waves below, which carries the most energy? A) Microwave. B) Radio wave. C) Ultraviolet ray. D) Visible light. Show Answer Correct Answer: C) Ultraviolet ray. 7. Which electromagnetic waves help doctors detect broken bones inside your body? A) Gamma rays. B) X-rays. C) Ultraviolet rays. D) None of the above. Show Answer Correct Answer: B) X-rays. 8. How does light travel through a uniform medium? A) In an unpredictable course. B) In a straight line. C) In an angled path. D) In a wave-like pattern. Show Answer Correct Answer: B) In a straight line. 9. When a light ray passes from water (n=1.333) into diamond (n=2.419) at an angle of 45$^\circ$, its path is A) Bent towards the normal. B) Bent away from the normal. C) Parallel to the normal. D) Not bent. Show Answer Correct Answer: A) Bent towards the normal. 10. Which electromagnetic wave has the shortest wavelenght? A) Radio waves. B) Gamma rays. C) Infrared radiation. D) Microwaves. Show Answer Correct Answer: B) Gamma rays. 11. On AM broadcasts, what remains constant? A) The amplitude. B) The frequency. C) The music. D) The speech. Show Answer Correct Answer: B) The frequency. 12. Ultraviolet waves have the next shortest wavelength after which type of light? A) Infrared light. B) X-ray light. C) Visible light. D) Gamma-ray light. Show Answer Correct Answer: C) Visible light. 13. Which type of wave can travel through vacuum? A) Electromagnetic wave. B) Longitudinal wave. C) Mechanical wave. D) Sound wave. Show Answer Correct Answer: A) Electromagnetic wave. 14. Which of the following correctly describes the speed of electromagnetic waves in a vacuum? A) They travel at the speed of sound. B) They travel at a constant speed of $3 \times 10^8$. C) Their speed varies with frequency. D) They do not travel in a vacuum. Show Answer Correct Answer: B) They travel at a constant speed of $3 \times 10^8$. 15. The definition of the word refract is ..... A) To make warm. B) To go through. C) To bend. D) To create energy. Show Answer Correct Answer: C) To bend. 16. Which among the following facts about electromagnetic waves is the CORRECT explanation? A) They travel at a speed of 3.0 x 108 m/s. B) They require a medium to propagate. C) They have electric and magnetic components. D) They are made up of tiny bundles of energy called photons. Show Answer Correct Answer: A) They travel at a speed of 3.0 x 108 m/s. 17. What are the three primary colors of light? A) Red, Yellow, Blue. B) Red, Green, Yellow. C) Red, Green, Blue. D) Yellow, Blue, Green. Show Answer Correct Answer: C) Red, Green, Blue. 18. Electromagnetic waves are split based on the different frequencies. This is called the ..... A) Mechanical waves. B) Electronic waves. C) Electromagnetic spectrum. D) Expecto Patronum. Show Answer Correct Answer: C) Electromagnetic spectrum. 19. What is the origin of electromagnetic waves? A) The rotation of planets. B) The accelerated motion of electrons. C) The splitting of atoms. D) The reflection of light. Show Answer Correct Answer: B) The accelerated motion of electrons. 20. A change in the frequency of a carrier wave. A) Amplitude modulation (AM). B) Frequency modulation (FM). C) Carrier wave. D) Transmission. Show Answer Correct Answer: B) Frequency modulation (FM). 21. True or False:Violet has the shortest wavelength A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. Thermographic cameras can be used to detect the temperature of objects by using ..... A) Gamma rays. B) X-ray. C) Thermometer. D) Infrared radiation. Show Answer Correct Answer: D) Infrared radiation. 23. Electromagnetic waves are deflected by electric field and magnetic field. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 24. What type of electromagnetic wave is primarily used in remote controls? A) Infrared wave. B) Microwave. C) Radio wave. D) Ultraviolet wave. Show Answer Correct Answer: A) Infrared wave. 25. What are the MOST energetic electromagnetic waves called? A) Gamma rays. B) X-rays. C) Microwaves. D) Ultraviolet light. Show Answer Correct Answer: A) Gamma 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