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Class 12 Physics (Part I) Chapter 8 Electromagnetic Waves Quiz 11 (25 MCQs)

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1. What quality determines the different names assigned to the various sections of the electromagnetic spectrum?
2. Visible light passes through water. Other types of electromagnetic radiation are able to pass through other materials. Which of the following are used in medical technology because they can pass through certain parts of the human body?
3. A wave is a disturbance that transfers ..... from one place to another.
4. EM waves used to broadcast television signals
5. When using scientific notation, a negative exponent means .....
6. Is the following sentence true or false? All electromagnetic waves travel at the same speed through a vacuum.
7. Electromagnetic waves with the lowest frequency and least amount of energy are .....
8. Produced by nuclear reactions
9. Long distance radio communication. Local radio and TV broadcasting. These are the application of
10. One of Maxwell's starting points wasA varying magnetic field:
11. What are Em waves generated by?
12. Which of the following is an example of non-ionizing radiation?
13. Infrared waves are can be seen by the human eyes.
14. Wavelength is a characteristic that defines ..... , irrespective of its source.
15. The source of all electromagnetic waves is charge that is changing speed or direction.
16. Our skin color depends on the amount of pigment called ..... in our cells to protect us from the Sun's harmful rays.
17. Transverse waves move ..... to motion of medium particles?
18. A wave has frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave? (a)
19. A radiation comes from electromagnetic waves with sufficiently high energy that can possibly cause cellular and DNA damage
20. In the visible spectrum, which colour has the longest wavelength?
21. This part of the spectrum can be further divided into different subsections, each representative of a particular color, commonly known as the colors of a rainbow, ROYGBV.
22. The wavelengths become shorter as the temperature of the material increases.
23. X-rays are used in medical applications to produce images of bones, tissues, and organs. X-rays are capable of penetrating tissues such as skin, but are less capable of penetrating bone. This property of X-rays derives from which characteristic of the rays?
24. Electromagnetic waves transfer energy from the source of the waves to an absorber.
25. What electromagnetic wave radiated by plants and animals as heat waves?
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