NEET Physics: Electromagnetic Waves — MCQ Test 17

Q6. Which of the following devices is used to detect infrared waves?

Q7. An electromagnetic wave in vacuum has a frequency of \( 25 \, \text{MHz} \). What is its wavelength? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q8. A capacitor is charged such that the electric flux through a surface between the plates changes at a rate of \( 5 \times 10^{10} \, \text{Vm/s} \). What is the displacement current? (Given \( \varepsilon_0 = 8.85 \times 10^{-12} \, \text{F/m} \))

Q9. Which frequency range corresponds to the FM radio band as per the document?

Q10. What is the approximate wavelength range of gamma rays as per the document?

NEET Physics — Electromagnetic Waves

Free MCQ Test 17 of 24

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According to Maxwell's equations, what is the relationship between the speed of electromagnetic waves in vacuum and the constants \( \mu_0 \) and \( \varepsilon_0 \)?

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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 According, Equations, Relationship, Electromagnetic, Constants, and Varepsilon.

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. According to Maxwell's equations, what is the relationship between the speed of electromagnetic waves in vacuum and the constants \( \mu_0 \) and \( \varepsilon_0 \)?

  • A. \( c = \frac{1}{\sqrt{\mu_0 \varepsilon_0}} \)
  • B. \( c = \sqrt{\mu_0 \varepsilon_0} \)
  • C. \( c = \mu_0 \varepsilon_0 \)
  • D. \( c = \frac{\mu_0}{\varepsilon_0} \)

Q2. An electromagnetic wave in vacuum has a wavelength of \( 20 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

  • A. \( 1 \times 10^7 \, \text{Hz} \)
  • B. \( 1.25 \times 10^7 \, \text{Hz} \)
  • C. \( 1.5 \times 10^7 \, \text{Hz} \)
  • D. \( 2 \times 10^7 \, \text{Hz} \)

Q3. What property of electromagnetic waves explains why their speed in a medium is less than in vacuum?

  • A. Frequency variation
  • B. Medium’s electric properties
  • C. Wavelength increase
  • D. Energy absorption

Q4. In the context of electromagnetic wave propagation, what ensures that the wave remains transverse?

  • A. Presence of a medium
  • B. High frequency of oscillation
  • C. Perpendicular field orientation
  • D. Longitudinal field components

Q5. Why are ultraviolet rays more effective than visible light for sterilizing surfaces?

  • A. Visible light is more penetrating
  • B. Higher energy of UV rays
  • C. UV rays are less absorbed
  • D. Visible light heats surfaces

+ 5 more questions in the actual test

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