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ISC Class 12 Electromagnetic Waves — practice questions — page 2

Explore 52 free Electromagnetic Waves questions in ISC Class 12 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 31–52 of 52.

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 →Gamma rays are produced in which kind of process?Read the answer and worked solution →True or false about EM wavesRead the answer and worked solution →The total current in the Ampere Maxwell law is conduction current plus:Read the answer and worked solution →Name the radiationRead the answer and worked solution →Becquerel's emission penetrated black paper and:Read the answer and worked solution →X-rays are emitted from atoms that are:Read the answer and worked solution →Match the band to its useRead the answer and worked solution →Complete the Maxwell ruleRead the answer and worked solution →NEET · Physics · EM Spectrum — Increasing FrequencyRead the answer and worked solution →Electromagnetic waves bingoRead the answer and worked solution →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 →Spot the odd one outRead the answer and worked solution →When unpolarized light passes through a single ideal polarizer, the transmitted intensity is:Read the answer and worked solution →**Malus' law** gives the transmitted intensity through a second polarizer as:Read the answer and worked solution →

Worked practice questions

Electromagnetic waves travel at which speed in free space?

  1. Speed of light
  2. Speed of sound
  3. Speed of Earth
  4. Speed of winds
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Correct answer: A. Speed of light

1. Maxwell computed the wave speed from his equations. 2. It matched a value already known from optics. 3. The waves travel at the speed of light. 4. So the answer is speed of light. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_

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Maxwell's calculation showed that light is:

  1. A magnetic field line
  2. An electromagnetic wave
  3. A stream of hot air
  4. A displacement current
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Correct answer: B. An electromagnetic wave

1. The predicted wave speed equalled the measured speed of light. 2. That match could not be a coincidence. 3. So light itself is an electromagnetic wave. 4. The answer is an electromagnetic wave. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_

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Radio waves are produced by accelerated charges in:

  1. Inner shell orbits
  2. Hot molecules
  3. Conducting wires
  4. Atomic nuclei
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Correct answer: C. Conducting wires

1. Different parts of the spectrum come from different sources. 2. Radio waves come from currents oscillating in an aerial. 3. That is accelerated motion of charges in conducting wires. 4. So the answer is conducting wires. _Source: syllabus Physics, Ch 8 'Electromagnetic Waves'_

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More Physics topics

Moving Charges and MagnetismCurrent ElectricityElectromagnetic Induction & Alternating CurrentSemiconductor ElectronicsRay Optics and Optical InstrumentsAtoms and NucleiDual Nature of Radiation and MatterElectric Charges and Fields