Electro-magnetic Spectrum of Light in Physics Solved MCQs

Electro-Magnetic Spectrum of Light

1. Which colour of light has the longest wavelength in the electromagnetic spectrum?

a) Red

b) Blue

c) Green

d) Violet

2. What phenomenon causes the dispersion of light into its component colours when passing through a prism?

a) Refraction

b) Reflection

c) Diffraction

d) Dispersion

3. In the electromagnetic spectrum, which region has shorter wavelengths than visible light?

a) Infrared

b) Ultraviolet

c) Microwave

d) Radio waves

4. Which property of a medium affects the speed of light and leads to different colours being refracted by different amounts?

a) Density

b) Temperature

c) Transparency

d) Elasticity

5. What is the order of colours in the visible spectrum from longest to shortest wavelength?

a) Violet, Indigo, Blue, Green, Yellow, Orange, Red

b) Red, Orange, Yellow, Green, Blue, Indigo, Violet

c) Blue, Green, Yellow, Orange, Red, Indigo, Violet

d) Red, Yellow, Green, Blue, Indigo, Violet

6. . Which color has the highest frequency in the visible spectrum?

a. Red

b. Blue

c. Green

d. Yellow

7. What is the approximate wavelength range of ultraviolet (UV) light in the electromagnetic spectrum?

a. 700 nm to 1 mm

b. 400 nm to 700 nm

c. 10 nm to 400 nm

d. 20 nm to 200 nm

8. Infrared radiation has wavelengths:

a. Longer than visible light

b. Shorter than visible light

c. Equal to visible light

d. None of them

9. Which color of light has the shortest wavelength in the visible spectrum?

a. Red

b. Blue

c. Violet

d. Green

10. What is the relationship between frequency and wavelength in the electromagnetic spectrum?

a. Inversely proportional

b. Directly proportional

c. No relationship

d. None of them

11. X-rays have shorter wavelengths than:

a. Microwaves

b. Ultraviolet light

c. Infrared radiation

d. All of them

12. The electromagnetic spectrum includes all of the following except:

a. Radio waves

b. Sound waves

c. Gamma rays

d. Infrared waves

13. What phenomenon is responsible for the formation of a rainbow when light passes through water droplets?

a) Diffraction

b) Refraction

c) Reflection

d) Dispersion

14. Which colour of light undergoes the least deviation when passing through a water droplet?

a) Red

b) Blue

c) Green

d) Violet

15. What term describes the separation of light into its component colours based on their wavelengths when passing through a prism or water droplets?

a) Absorption

b) Dispersion

c) Reflection

d) Transmission

16. In the context of a rainbow, why does each raindrop contribute to the overall spectrum of colours?

a) Due to interference

b) Due to diffraction

c) Due to reflection

d) Due to varying angles of refraction

17. As light passes through a water droplet, what happens to its speed and wavelength?

a) Speed increases, wavelength decreases

b) Speed decreases, wavelength increases

c) Speed decreases, wavelength decreases

d) Speed increases, wavelength increases

18. Which of the following electromagnetic waves has the longest wavelength?

a) Gamma rays

b) Radio waves

c) X-rays

d) Infrared radiation

19. What is the speed of electromagnetic waves in a vacuum?

a) 300,000 km/s

b) 150,000 km/s

c) 1,000,000 km/s

d) 500,000 km/s

20. In which part of the electromagnetic spectrum does visible light belong?

a) Infrared radiation

b) Microwave

c) Radio waves

d) Optical (visible) spectrum

21. What is the primary source of ultraviolet (UV) radiation on Earth?

a) Sun

b) Moon

c) Asteroids

d) Comets

22. Which electromagnetic waves are commonly used in medical imaging?

a) Ultraviolet rays

b) Microwaves

c) X-rays

d) Infrared radiation

23. What is the main application of microwaves in household appliances?

a) Cooking

b) Boiling

c) Medical imaging

d) Sterilization

24. Which electromagnetic waves are often used for electronic communication?

a) Infrared radiation

b) Radio waves

c) Ultraviolet rays

d) Gamma rays

25. In the electromagnetic spectrum, which region has the highest energy per photon?

a) Radio waves

b) Microwaves

c) Gamma rays

d) Infrared radiation

26. How does the frequency of electromagnetic waves change as you move from radio waves to gamma rays?

a) Decreases

b) Increases

c) Remains constant

d) Varies randomly

27. What is the role of the ozone layer in relation to electromagnetic waves?

a) Blocks radio waves

b) Absorbs ultraviolet (UV) radiation

c) Enhances X-ray transmission

d) Reflects microwaves

28. What is the main component of the electromagnetic spectrum responsible for visible light?

a. Radio waves

b. Microwaves

c. Infrared radiation

d. Ultraviolet radiation

29. Which part of the electromagnetic spectrum is used for communication through satellite television?

a. Gamma rays

b. X-rays

c. Radio waves

d. Ultraviolet radiation

30. What is the primary source of natural radio waves in the electromagnetic spectrum?

a. Earth's magnetic field

b. Sun

c. Human-made devices

d. Lightning

31. What type of waves propagate through optical fibers in the electromagnetic spectrum?

a) Radio waves

b) Microwaves

c) Infrared waves

d) Ultraviolet waves

32. Which property of optical fibers allows them to transmit data over long distances without significant loss?

a) High absorption

b) Low refraction

c) Total internal reflection

d) Low transmission speed

33. In optical fiber communication, what is the main purpose of the core material?

a) To enhance flexibility

b) To provide mechanical strength

c) To carry the optical signals

d) To protect against external interference

34. What is the wavelength range of typical optical fiber communication systems in the electromagnetic spectrum?

a) Microwave range

b) Visible light range

c) X-ray range

d) Radio wave range

35. Which of the following is a key advantage of using optical fibers for communication?

a) High susceptibility to electromagnetic interference

b) Low bandwidth capacity

c) Immunity to signal attenuation

d) Ease of installation

36. Which portion of the electromagnetic spectrum is commonly used for communication in technologies like Wi-Fi and mobile phones?

a) Infrared

b) Ultraviolet

c) Radio waves

d) X-rays

37. What type of waves are utilized in medical imaging technologies?

a) Microwaves

b) Gamma rays

c) Ultraviolet waves

d) Radio waves

38. In fiber optic communication, information is transmitted using:

a) Mechanical waves

b) Sound waves

c) Electromagnetic waves

d) Water waves

39. Which part of the electromagnetic spectrum is harnessed for satellite communication?

a) Infrared

b) Microwave

c) Visible light

d) Ultraviolet

40. What type of waves are employed in radar systems for detecting the location and speed of objects, such as aircraft or weather patterns?

a) Radio waves

b) Infrared waves

c) Ultraviolet waves

d) Visible light waves

41. In RFID (Radio-Frequency Identification) technology, which part of the electromagnetic spectrum is commonly used for communication between tags and readers?

a) Ultraviolet

b) Infrared

c) Microwave

d) X-rays

42. What medical imaging technique utilizes sound waves for visualization?

a) X-ray imaging

b) Magnetic resonance imaging (MRI)

c) Ultrasound imaging

d) Positron emission tomography (PET)

43. In the electromagnetic spectrum, which range of waves is associated with Magnetic Resonance Imaging (MRI)?

a) Infrared

b) Radio waves

c) Gamma rays

d) Visible light

44. How are radio waves employed in the medical field?

a) Therapeutic radiation

b) Communication with patients

c) Magnetic resonance imaging (MRI)

d) Sterilization of medical equipment

45. Which electromagnetic waves are commonly used for cancer treatment?

a) Ultraviolet rays

b) Infrared rays

c) Gamma rays

d) Microwaves

46. What is the primary purpose of using ultrasound waves in medical diagnostics?

a. Internal imaging

b. Cancer treatment

c. Monitoring brain activity

d. Sound therapy

47. Which part of the electromagnetic spectrum is commonly used in laser therapy for various medical conditions?

a. Infrared rays

b. Ultraviolet rays

c. Visible light

d. Radio waves

48. What is the primary function of microwaves in engineering applications?

a) Communication

b) Cooking

c) Medical Imaging

d) Material Testing

49. In fiber optics, what type of waves are utilized for data transmission?

a) Radio waves

b) Sound waves

c) Light waves

d) Gamma rays

50. How are ultrasonic waves applied in engineering applications?

a) Data storage

b) Cleaning

c) Satellite communication

d) Thermal imaging

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