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Electromagnetic Waves — NEET Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What expression defines Maxwell's displacement current through a surface?
  1. ε₀ dΦE/dt ✓
  2. μ₀ dΦB/dt
  3. ε₀ΦE
  4. dQ/dΦE
Answer: A. Displacement current is id=ε₀ dΦE/dt and acts as a magnetic-field source.
Why not B: Changing magnetic flux generates electric circulation rather than the added current in Ampere's law.
Why not C: Electric flux itself lacks the time-rate factor needed for current units.
Why not D: Charge divided by electric flux is permittivity-like, not a current.
During ideal charging of a parallel-plate capacitor, how does displacement current between the plates compare with conduction current in the wires?
  1. It is always zero
  2. It is twice as large
  3. It is equal in magnitude ✓
  4. It flows only after charging stops
Answer: C. Since ΦE=Q/ε₀, id=ε₀dΦE/dt=dQ/dt=ic.
Why not A: The changing electric flux between the plates produces nonzero displacement current.
Why not B: Charge continuity requires the same current scale, not a doubled one.
Why not D: When charging stops the electric field is steady and displacement current vanishes.
A 100 pF capacitor is connected to 230 V rms at angular frequency 300 rad s⁻¹. What rms conduction current flows in its leads?
  1. 6.90×10⁻⁶ A ✓
  2. 2.30×10⁻⁸ A
  3. 6.90×10⁻³ A
  4. 7.67×10⁻¹ A
Answer: A. I=ωCV=(300)(100×10⁻¹²)(230)=6.90×10⁻⁶ A.
Why not B: This multiplies C by V but omits angular frequency.
Why not C: This treats picofarads as nanofarads.
Why not D: This divides voltage by ωC rather than multiplying by ωC.

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Every NCERT question in this chapter is solved, free: NCERT solutions — Electromagnetic Waves →

Other NEET Physics chapters

Units and MeasurementMotion in a Straight LineMotion in a PlaneLaws of MotionWork Energy and PowerSystems of Particles and Rotational Motion

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Questions

How many NEET questions are there on Electromagnetic Waves?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.