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Agniveer Air Force Electromagnetic Waves — practice questions

Explore 20 free Electromagnetic Waves questions in Agniveer Air Force Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Waves questions and exercises with answers

Showing questions 1–20 of 20.

Whose set of equations predicted electromagnetic waves?Read the answer and worked solution →The extra term Maxwell added to Ampere's law is the:Read the answer and worked solution →Electromagnetic waves are produced by charges that are:Read the answer and worked solution →Who first demonstrated electromagnetic waves experimentally?Read the answer and worked solution →Infrared waves are also referred to as:Read the answer and worked solution →Radar systems used in aircraft navigation use:Read the answer and worked solution →Most ultraviolet radiation from the Sun is absorbed in the:Read the answer and worked solution →In an electromagnetic wave, E and B are:Read the answer and worked solution →Electromagnetic waves travel at which speed in free space?Read the answer and worked solution →Maxwell's calculation showed that light is:Read the answer and worked solution →Radio waves are produced by accelerated charges in:Read the answer and worked solution →Which radiation is trapped by carbon dioxide and water vapour?Read the answer and worked solution →Household TV remote switches work using:Read the answer and worked solution →X-rays are produced by bombarding a metal target with:Read the answer and worked solution →The generalised form of Ampere's law is known as the:Read the answer and worked solution →The total current in the Ampere Maxwell law is conduction current plus:Read the answer and worked solution →Gamma rays are produced in which kind of process?Read the answer and worked solution →X-rays are emitted from atoms that are:Read the answer and worked solution →Compared with visible light, infrared waves have frequencies that are:Read the answer and worked solution →Which band is used as a diagnostic tool in medicine?Read the answer and worked solution →

Worked practice questions

Whose set of equations predicted electromagnetic waves?

  1. Maxwell
  2. Faraday
  3. Coulomb
  4. Ampere
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Correct answer: A. Maxwell

1. Four equations tie the electric and magnetic fields together. 2. They are named after the physicist who assembled them. 3. They are Maxwell's equations. 4. So the answer is Maxwell. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_

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The extra term Maxwell added to Ampere's law is the:

  1. Direct current path
  2. Displacement current
  3. Conduction current
  4. Alternating current
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Correct answer: B. Displacement current

1. A changing electric field also sources a magnetic field. 2. Maxwell gave that source a current-like name. 3. It is the displacement current. 4. So the answer is displacement current. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_

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Electromagnetic waves are produced by charges that are:

  1. Uncharged
  2. Neutralised
  3. Accelerated
  4. Motionless
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Correct answer: C. Accelerated

1. A charge sitting still gives only a static field. 2. A charge moving steadily gives a steady magnetic field. 3. Only accelerated charges radiate electromagnetic waves. 4. So the answer is accelerated. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_

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