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Electromagnetic Waves

Physics · Class 12 · All

PhysicsClass 12AllEasy
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The electromagnetic waves used in radar systems are

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All 15 questions in this quiz

  1. According to Maxwell's theory, electromagnetic waves are produced by

    1. Constant electric fields
    2. Changing electric and magnetic fields
    3. Stationary magnetic fields only
    4. Gravitational fields

  2. The wavelength range of visible light is approximately

    1. 10 nm to 100 nm
    2. 400 nm to 700 nm
    3. 700 nm to 1000 nm
    4. 1 mm to 10 mm

  3. Which of the following electromagnetic waves is used in night vision technology?

    1. Infrared rays
    2. Gamma rays
    3. Ultraviolet rays
    4. X-rays

  4. The momentum associated with electromagnetic radiation is due to

    1. Its mass only
    2. Its energy
    3. Its electric charge
    4. Its temperature

  5. The energy carried by an electromagnetic wave is stored in

    1. Electric field only
    2. Magnetic field only
    3. Both electric and magnetic fields
    4. Gravitational field

  6. Which electromagnetic waves have the longest wavelength?

    1. Gamma rays
    2. X-rays
    3. Radio waves
    4. Ultraviolet rays

  7. In an electromagnetic wave, the electric field and magnetic field are

    1. Parallel to each other
    2. Perpendicular to each other and to the direction of propagation
    3. Along the direction of propagation
    4. Always zero

  8. Which electromagnetic radiation is commonly used for sterilization and killing bacteria?

    1. Radio waves
    2. Infrared rays
    3. Ultraviolet rays
    4. Microwaves

  9. The displacement current was introduced by

    1. Newton
    2. Maxwell
    3. Einstein
    4. Faraday

  10. The electromagnetic waves used in radar systems are

    1. Radio waves
    2. Microwaves
    3. Ultraviolet rays
    4. Gamma rays

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

    1. Radio waves
    2. Microwaves
    3. Ultraviolet rays
    4. Gamma rays

  12. The relation between the speed of electromagnetic waves, electric field amplitude, and magnetic field amplitude is

    1. c = E/B
    2. c = B/E
    3. c = EB
    4. c = E + B

  13. Electromagnetic waves are

    1. Longitudinal waves
    2. Transverse waves
    3. Mechanical waves
    4. Matter waves

  14. The speed of electromagnetic waves in vacuum is

    1. 3 × 10⁶ m/s
    2. 3 × 10⁸ m/s
    3. 3 × 10¹⁰ m/s
    4. 3 × 10⁴ m/s

  15. Electromagnetic waves are produced by

    1. Stationary charges only
    2. Moving charges with uniform velocity
    3. Accelerating charges
    4. Neutral particles only