Physics Alternating Current PMDC Conceptual Practice
PMDC Verified Question 19 of 127
What is the fundamental time period of the standard domestic alternating current supply in Pakistan?
A
\(0.02\text{ s}\)
B
\(0.01\text{ s}\)
C
\(0.05\text{ s}\)
D
\(0.04\text{ s}\)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: \(0.02\text{ s}\)
Concept:

The domestic AC supply in Pakistan operates at a standard grid frequency of \(f = 50\text{ Hz}\). Time period \(T\) is the reciprocal of frequency.

Formula / Reaction:

$$T = \frac{1}{f}$$

Solution:

  • Given frequency: \(f = 50\text{ Hz}\).


  • \(T = \frac{1}{50\text{ s}^{-1}} = 0.02\text{ s} = 20\text{ ms}\).


Why other options are incorrect:

  • Opt_B: \(0.01\text{ s}\) is the half-period (\(T/2\)), which is the time between successive zero crossings or polarity reversals.


  • Opt_C: \(0.05\text{ s}\) corresponds to a frequency of \(20\text{ Hz}\).


  • Opt_D: \(0.04\text{ s}\) corresponds to a frequency of \(25\text{ Hz}\).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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