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Alternating Current
NEET Physics • 10 questions • Free on ExamBattle
Practice Questions
Q1
The rms value of AC voltage V = V₀ sinωt is:
- A. V₀
- B. V₀/√2
- C. V₀/2
- D. √2·V₀
Q2
In a purely capacitive AC circuit, current:
- A. Lags voltage by 90°
- B. Leads voltage by 90°
- C. Is in phase with voltage
- D. Lags voltage by 45°
Q3
At resonance in a series LCR circuit, the impedance equals:
- A. Zero
- B. R (resistance only)
- C. XL or XC
- D. L/C
Q4
The resonant frequency of a series LCR circuit is:
- A. f = 2π√(LC)
- B. f = 1/(2π√(LC))
- C. f = √(LC)/2π
- D. f = LC/2π
Q5
The power factor of a purely resistive AC circuit is:
- A. 0
- B. 1
- C. 0.5
- D. ∞
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