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Alternating Current — NEET & JEE 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 and JEE 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 and JEE 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.