Solved Alternating Current and RMS Values (Magnetism

Alternating Current and RMS Values MCQs for Competitive Exams

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Topic Notes: Alternating Current and RMS Values

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Alternating Current and RMS Values MCQs in Physics are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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In a 60 W light bulb operating on a 50 Hz AC supply, how many times does the current fluctuate to zero per second?

100 times

50 times

25 times

70 times

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What is the characteristic frequency relationship for a circuit containing a capacitor and a resistor?

R/C

C/R

1/RC

1/2RC

Report

For a 60 W light bulb operating on standard AC power, what is the range of current fluctuation per second?

−0.81 A to 0.81 A

−0.71 A to 0.71 A

−0.51 A to 0.51 A

−0.61 A to 0.61 A

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What is the average power dissipated per cycle in a resistor when an AC voltage V = V0 cos(ωt) is applied?

V√/√2R

2/√2√R

V/√2√R

V02/√2R

Report

What is the phase behavior of current relative to voltage when alternating current flows through a capacitor?

The current leads the voltage by a 90-degree phase angle

The current leads the voltage by a 45-degree phase angle

The voltage leads the current by a 90-degree phase angle

The voltage leads the current by a 45-degree phase angle

Report

What are the ideal physical characteristics of a choke coil used in AC circuits to limit current with minimal power loss?

high inductance and high resistance

low inductance and high resistance

high inductance and low resistance

low inductance and low resistance

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What type of current is generated by an AC generator?

alternative current

fixed current

negative current

direct current

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Alternating Current and RMS Values MCQs for Competitive Exams

Alternating Current and RMS Values MCQs for Competitive Exams

Topic Notes: Alternating Current and RMS Values

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