NEET Physics: Electromagnetic Waves — MCQ Test 3

Q6. An electromagnetic wave has a wave number \( k = 3 \, \text{rad/m} \). What is its wavelength in vacuum?

Q7. What did Maxwell's unification of electricity, magnetism, and light lead to?

Q8. What enables electromagnetic waves to propagate through vacuum?

Q9. A capacitor in a circuit has a rate of change of electric flux of \( 4 \times 10^{11} \, \text{Vm/s} \). What is the displacement current? (Given \( \varepsilon_0 = 8.85 \times 10^{-12} \, \text{F/m} \))

Q10. According to Maxwell's equations, what is the speed of electromagnetic waves in a medium with permittivity \( \varepsilon \) and permeability \( \mu \)?

Q11. An electromagnetic wave in vacuum has an electric field amplitude of \( 30 \, \text{V/m} \). What is the magnetic field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q12. What is the approximate wavelength range of microwaves as per the document?

Q13. An electromagnetic wave propagates in the \( z \)-direction with electric field along the \( x \)-axis. In which direction is the magnetic field oriented?

Q14. What insight does the Ampere-Maxwell law provide about the symmetry of electromagnetic fields?

Q15. What precaution must be taken when using X-rays in medical applications?

NEET Physics — Electromagnetic Waves

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1Question 1 of 15
Medium

Why does the speed of electromagnetic waves in vacuum remain constant irrespective of their source’s motion?

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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 15 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, Constant, Irrespective, Ultraviolet, Purifiers, and Frequency.

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. Why does the speed of electromagnetic waves in vacuum remain constant irrespective of their source’s motion?

  • A. It depends only on universal constants
  • B. It varies with the source’s velocity
  • C. It depends on the medium’s density
  • D. It is influenced by frequency

Q2. Why are ultraviolet lamps used in water purifiers?

  • A. To heat the water
  • B. To enhance taste
  • C. To kill germs
  • D. To emit visible light

Q3. Which frequency range corresponds to the ultrahigh frequency (UHF) band used by cellular phones?

  • A. \( 88 \, \text{MHz} \) to \( 108 \, \text{MHz} \)
  • B. \( 530 \, \text{kHz} \) to \( 1710 \, \text{kHz} \)
  • C. Within \( 500 \, \text{kHz} \) to \( 1000 \, \text{MHz} \)
  • D. \( 4 \times 10^{14} \, \text{Hz} \) to \( 7 \times 10^{14} \, \text{Hz} \)

Q4. Why do X-rays require careful handling in medical applications?

  • A. Low energy absorption
  • B. Visible light emission
  • C. Potential tissue damage
  • D. Thermal heating

Q5. What is the typical wavelength range of X-rays as per the document?

  • A. \( > 0.1 \, \text{m} \)
  • B. \( 10^{-8} \, \text{m} \) to \( 10^{-13} \, \text{m} \)
  • C. \( 1 \, \text{mm} \) to \( 700 \, \text{nm} \)
  • D. \( 400 \, \text{nm} \) to \( 0.6 \, \text{nm} \)

+ 10 more questions in the actual test

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