Class 12 Physics — Chapter 8: Electromagnetic Waves
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Practise Class 12 Physics Chapter 8, "Electromagnetic Waves", with 90 NCERT-aligned multiple-choice questions. The set is split into 30 Easy, 30 Medium and 30 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Electromagnetic Waves" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Electromagnetic Waves, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Physics mastery score. A few sample questions are shown below; sign in free to practise all 90.
Key concepts: Electromagnetic Waves (Class 12 Physics)
This chapter introduces displacement current, the nature of electromagnetic waves, and the electromagnetic spectrum.
- Displacement current
- Maxwell added a current due to a changing electric field, making Ampere's law complete and predicting EM waves.
- Nature of EM waves
- Oscillating electric and magnetic fields, mutually perpendicular and perpendicular to the direction of propagation (transverse).
- Speed of light
- EM waves travel in vacuum at c = 1/√(μ₀ε₀) ≈ 3 × 10⁸ m/s; E₀/B₀ = c.
- Energy and momentum
- EM waves carry energy (shared equally by E and B fields) and momentum, so they exert radiation pressure.
- EM spectrum
- In order of increasing frequency: radio, microwave, infrared, visible, ultraviolet, X-rays and gamma rays.
Key formulas — Electromagnetic Waves
💡 Exam tips for Electromagnetic Waves
- Learn the EM spectrum order by increasing frequency (radio → gamma) and decreasing wavelength.
- E and B are in phase, mutually perpendicular, and both perpendicular to the propagation direction.
Sample questions
Speed of EM waves in vacuum:
c ≈ 3×10⁸ m/s.
Increasing frequency order:
Standard EM spectrum.
EM waves were predicted by:
Hertz experimentally confirmed Maxwell's prediction.
Electromagnetic Waves — FAQs
What are the key concepts in Class 12 Physics Electromagnetic Waves?+
This chapter introduces displacement current, the nature of electromagnetic waves, and the electromagnetic spectrum. Key ideas include Displacement current, Nature of EM waves, Speed of light, Energy and momentum, EM spectrum.
What does Class 12 Physics Chapter 8 (Electromagnetic Waves) cover on XamBaaz?+
It covers 90 NCERT-aligned MCQs on "Electromagnetic Waves" — 30 Easy, 30 Medium and 30 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Electromagnetic Waves" questions free to practise?+
Yes — sign in with Google to practise "Electromagnetic Waves" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Electromagnetic Waves" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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