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Alternating Current — 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

For sinusoidal current with peak value Im, what is its rms value?
  1. Im/√2 ✓
  2. √2 Im
  3. Im/2
  4. 2Im
Answer: A. Irms=√⟨i²⟩=Im/√2 for i=Im sinωt.
Why not B: This converts rms to peak rather than peak to rms.
Why not C: The mean of sin² is one-half, but rms takes the square root afterward.
Why not D: Rms current cannot exceed the sinusoid's peak value.
A household supply is specified as 220 V rms. What is its sinusoidal peak voltage?
  1. 110 V
  2. 156 V
  3. 311 V ✓
  4. 440 V
Answer: C. Vm=√2 V=(1.414)(220 V)=311 V.
Why not A: This divides the rms value by two rather than multiplying by √2.
Why not B: This divides by √2 and converts peak to rms in the wrong direction.
Why not D: This doubles the rms value instead of using the √2 factor.
A lamp rated 100 W operates from a 220 V rms supply and behaves resistively. What is its operating resistance?
  1. 484 Ω ✓
  2. 220 Ω
  3. 100 Ω
  4. 2.20 Ω
Answer: A. R=V²/P=(220)²/100=484 Ω.
Why not B: This treats the numerical voltage as the resistance without using the power rating.
Why not C: A watt rating is not numerically the resistance.
Why not D: This calculates V/P, which is reciprocal current rather than resistance.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Alternating Current →

Other NEET Physics chapters

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Questions

How many NEET questions are there on Alternating Current?

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.