Electromagnetic Waves Quiz - ICSE Class 12 Physics

Free practice quiz: Electromagnetic Waves (ICSE Class 12 Physics). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 12 Physics practice quiz has 50 multiple-choice questions on Electromagnetic Waves, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following electromagnetic waves has the highest frequency?

   1. Infrared radiation
   2. Microwaves
   3. Gamma rays
   4. Ultraviolet radiation
   Show answer

   Answer: C. Gamma rays

   The electromagnetic spectrum is ordered by frequency and wavelength. Gamma rays have the highest frequency and shortest wavelength, followed by X-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves.

2. When an electromagnetic wave passes from a vacuum into a medium, its speed:

   1. Increases
   2. Decreases
   3. Remains the same
   4. Becomes zero
   Show answer

   Answer: B. Decreases

   The speed of an electromagnetic wave in a medium is given by v = c/n, where 'c' is the speed of light in a vacuum and 'n' is the refractive index of the medium. Since n is greater than 1 for all media, the speed decreases.

3. The energy of a photon of electromagnetic radiation is quantized, meaning it exists in discrete packets called:

   1. Waves
   2. Frequencies
   3. Quanta
   4. Photons
   Show answer

   Answer: D. Photons

   According to quantum theory, electromagnetic radiation is emitted or absorbed in discrete packets of energy known as photons. The energy of each photon is given by E=hf.

4. The property of electromagnetic waves that allows them to be sorted by color is:

   1. Polarization
   2. Intensity
   3. Wavelength
   4. Amplitude
   Show answer

   Answer: C. Wavelength

   Different colors of visible light correspond to different wavelengths. When white light is dispersed, these different wavelengths are separated.

5. The SI unit for frequency is:

   1. Second (s)
   2. Meter (m)
   3. Hertz (Hz)
   4. Watt (W)
   Show answer

   Answer: C. Hertz (Hz)

   Hertz (Hz) is the SI unit of frequency, defined as one cycle per second.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The energy of a photon of electromagnetic radiation is directly proportional to its:
2. Which type of electromagnetic wave is commonly used in remote controls for televisions?
3. The phenomenon of diffraction of electromagnetic waves is most pronounced when the wavelength of the wave is:
4. A radio station broadcasts at a frequency of 98.3 MHz. What is the wavelength of these radio waves?
5. The speed of all electromagnetic waves in a vacuum is:
6. Which part of the electromagnetic spectrum is used for medical imaging like X-rays?
7. The phenomenon of polarization of electromagnetic waves demonstrates that they are:
8. Which of the following statements about the electromagnetic spectrum is INCORRECT?
9. The characteristic color of a visible light photon is determined by its:
10. Which type of electromagnetic radiation has the longest wavelength?
11. The process by which light waves can be filtered so that all the waves vibrate in a single plane is called:
12. A radar system uses which type of electromagnetic wave to detect objects?
13. What is the relationship between the energy (E) and the wavelength (λ) of a photon?
14. Which of the following is a characteristic of all electromagnetic waves?
15. The electromagnetic radiation that causes sunburn is:
16. If the frequency of an electromagnetic wave doubles, its wavelength will:
17. What phenomenon is responsible for the separation of white light into its constituent colors when passed through a prism?
18. The SI unit for the intensity of an electromagnetic wave is:
19. Which of the following statements about the interaction of electromagnetic waves with matter is generally true for X-rays?
20. The electromagnetic wave responsible for heating food in a microwave oven is:
21. When an electromagnetic wave undergoes reflection, its:
22. The intensity of an electromagnetic wave is proportional to the square of the:
23. Which phenomenon is evidence that light is a transverse wave?
24. If a source emits electromagnetic waves of a certain frequency, and these waves travel through a vacuum, their frequency will remain the same when they reach an observer. This is due to the principle of:
25. The spectrum of electromagnetic waves includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. These are arranged in order of:
26. Which part of the electromagnetic spectrum is used in night vision devices?
27. According to Planck's equation, the energy of a photon is directly proportional to its:
28. When light travels from a denser medium to a rarer medium, it bends:
29. Gamma rays are produced by:
30. The speed of an electromagnetic wave in a medium with refractive index 'n' is given by:
31. Which phenomenon demonstrates the wave nature of electrons when they are accelerated and interact with a crystal lattice?
32. The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength. If a photon has a frequency f, its energy is E = hf. If its wavelength is λ, its energy is E = hc/λ. Which property of the photon remains constant regardless of its frequency or wavelength?
33. When light waves from two coherent sources overlap, they exhibit:
34. Which of the following electromagnetic waves has the lowest energy?
35. The process of thermal radiation is the emission of electromagnetic waves from objects due to their temperature. Which part of the spectrum is primarily associated with this thermal radiation for objects at room temperature?
36. If the electric field component of an electromagnetic wave is oscillating along the y-axis, then the magnetic field component will be oscillating along the:
37. Which of the following is NOT a property of all electromagnetic waves?
38. The phenomenon of 'dispersion' in optics, which separates white light into its constituent colors, is a consequence of:
39. If the intensity of an electromagnetic wave is doubled, the amplitude of the electric field will change by a factor of:
40. Which type of electromagnetic radiation is used in sterilization of medical equipment due to its high energy and penetrating power?
41. The superposition of two electromagnetic waves can lead to:
42. Consider an electromagnetic wave propagating in the positive z-direction. If the electric field is polarized along the x-axis, what is the direction of propagation of the wave?
43. The frequency of a microwave oven is typically around 2.45 GHz. What is the wavelength of these microwaves?
44. Which of the following correctly describes the relationship between energy (E), frequency (f), and wavelength (λ) for an electromagnetic wave?
45. When an electromagnetic wave undergoes refraction, which of the following quantities changes?

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