NEET Physics: Electromagnetic Waves — MCQ Test 18

Q6. In electromagnetic theory, what explains the constant speed of light in vacuum across all frequencies?

Q7. Why does exposure to UV radiation cause tanning of the skin?

Q8. Which frequency range corresponds to short wave bands used in radio communication?

Q9. Why are microwaves suitable for radar systems in aircraft navigation?

Q10. An electromagnetic wave in vacuum has a magnetic field amplitude of \( B_0 = 2 \times 10^{-8} \, \text{T} \). What is the electric field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

NEET Physics — Electromagnetic Waves

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An electromagnetic wave in vacuum has an angular frequency \( \omega = 4 \times 10^{11} \, \text{rad/s} \). What is its frequency in Hz?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Electromagnetic Waves. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Electromagnetic, Frequency, Following, Statements, Spectrum, and Ultraviolet.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. An electromagnetic wave in vacuum has an angular frequency \( \omega = 4 \times 10^{11} \, \text{rad/s} \). What is its frequency in Hz?

  • A. \( 4 \times 10^{10} \, \text{Hz} \)
  • B. \( 5 \times 10^{10} \, \text{Hz} \)
  • C. \( 6.37 \times 10^{10} \, \text{Hz} \)
  • D. \( 8 \times 10^{10} \, \text{Hz} \)

Q2. Which of the following statements about the electromagnetic spectrum is true?

  • A. Each region has a fixed wavelength
  • B. All waves travel at different speeds
  • C. Regions are sharply divided
  • D. Boundaries are not sharply defined

Q3. Why are ultraviolet rays used in sterilization processes?

  • A. Low energy absorption
  • B. High energy disruption
  • C. Thermal heating
  • D. Visible light emission

Q4. Why do electromagnetic waves not require a medium for propagation?

  • A. They are self-sustaining field oscillations
  • B. They travel slower in vacuum
  • C. They rely on charged particles
  • D. They depend on mechanical vibrations

Q5. What is the approximate wavelength range of infrared waves as per the document?

  • A. \( > 0.1 \, \text{m} \)
  • B. \( 0.1 \, \text{m} \) to \( 1 \, \text{mm} \)
  • C. \( 400 \, \text{nm} \) to \( 0.6 \, \text{nm} \)
  • D. \( 1 \, \text{mm} \) to \( 700 \, \text{nm} \)

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