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NEET UG Electromagnetic Waves — practice questions

Explore 90 free Electromagnetic Waves questions in NEET UG 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 1–30 of 90.

Quantisation of electric charge means:Read the answer and worked solution →A charge of −12 nC is given to a body. The number of excess electrons on the body is:Read the answer and worked solution →Coulomb's law in vacuum is F = (1/4πε₀)(q₁q₂/r²). The value of 1/4πε₀ is approximately:Read the answer and worked solution →The speed of an EM wave in vacuum equals:Read the answer and worked solution →NEET · Physics · EM Spectrum — Order by FrequencyRead the answer and worked solution →NEET · Physics · EM Spectrum — Increasing FrequencyRead the answer and worked solution →Which additional current did Maxwell propose to remove the inconsistency?Read the answer and worked solution →Maxwell argued that a magnetic field is generated not only by a current but also by a:Read the answer and worked solution →Who experimentally demonstrated the existence of electromagnetic waves in 1885?Read the answer and worked solution →According to Maxwell's theory, which charges radiate electromagnetic waves?Read the answer and worked solution →A basic source of electromagnetic waves is which arrangement of charge?Read the answer and worked solution →Microwaves are suitable for radar systems in aircraft navigation because of their:Read the answer and worked solution →In an electromagnetic wave, the electric and magnetic fields are:Read the answer and worked solution →Relative to the direction of propagation, the two fields of an electromagnetic wave are:Read the answer and worked solution →The value of c derived by Maxwell equals the speed of light obtained from which measurements?Read the answer and worked solution →The energy carried by a propagating electromagnetic wave comes at the expense of the:Read the answer and worked solution →Cellular phones transmit voice communication using waves in which band?Read the answer and worked solution →Infrared radiation keeps the Earth warm through which effect?Read the answer and worked solution →Most ultraviolet radiation is absorbed in which layer of the atmosphere?Read the answer and worked solution →The electromagnetic spectrum stretches from gamma rays up to which waves?Read the answer and worked solution →In a microwave oven, the frequency is chosen to match the resonant frequency of:Read the answer and worked solution →Ultraviolet radiation can be focussed into narrow beams for which surgical use?Read the answer and worked solution →Whose technological use of electromagnetic waves led to the revolution in communication?Read the answer and worked solution →Which of these were only barely established at the time Maxwell was working?Read the answer and worked solution →Order the spectrumRead the answer and worked solution →Which band does the jobRead the answer and worked solution →Match the name to the contributionRead the answer and worked solution →Spot the false statementRead the answer and worked solution →Pick it fastRead the answer and worked solution →Whose set of equations predicted electromagnetic waves?Read the answer and worked solution →

Worked practice questions

Quantisation of electric charge means:

  1. Charge can take any continuous value
  2. All free charges are integral multiples of the elementary charge e (1.602 × 10⁻¹⁹ C)
  3. Only positive charges are quantised
  4. Charge is always zero
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Correct answer: B. All free charges are integral multiples of the elementary charge e (1.602 × 10⁻¹⁹ C)

**Quantisation of charge**: q = ne, where n is an integer (positive or negative) and e = 1.602 × 10⁻¹⁹ C (charge on proton; electron has -e). At macroscopic scales (1 μC ≈ 6 × 10¹² electrons) quantisation is unobservable matters only at microscopic level.

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A charge of −12 nC is given to a body. The number of excess electrons on the body is:

  1. 7.5 × 10¹⁰
  2. 1.92 × 10⁻²⁷
  3. 7.5 × 10¹⁹
  4. 1.92 × 10¹⁰
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Correct answer: A. 7.5 × 10¹⁰

n = |q|/e = (12 × 10⁻⁹) / (1.6 × 10⁻¹⁹) = **7.5 × 10¹⁰ electrons**. Body is negatively charged → excess electrons (matches the −12 nC sign).

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Coulomb's law in vacuum is F = (1/4πε₀)(q₁q₂/r²). The value of 1/4πε₀ is approximately:

  1. 8.85 × 10⁻¹² N m² C⁻²
  2. 9 × 10⁹ N m² C⁻²
  3. 1.6 × 10⁻¹⁹ N m² C⁻²
  4. 6.022 × 10²³
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Correct answer: B. 9 × 10⁹ N m² C⁻²

**k = 1/(4πε₀) ≈ 9 × 10⁹ N m²/C²** (in vacuum). ε₀ = 8.854 × 10⁻¹² C²/(N m²) is the permittivity of free space. In a medium, replace ε₀ by ε = ε₀ × ε_r (relative permittivity / dielectric constant).

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More Physics topics

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