Physics Work & Energy PMDC 2021
PMDC Verified Question 69 of 108
A machine does 2500 J of work in 1 min. What is the power developed by the machine?
A
21 W
B
42 W
C
150 W
D
2500 W
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 42 W
Concept:

Power is the rate of doing work. Time must be converted into SI units (seconds).

Formula:

$$ P = \frac{W}{t} $$

Solution:

  • Work (\( W \)) = 2500 J


  • Time (\( t \)) = 1 min = 60 s


  • \( P = \frac{2500}{60} = \frac{250}{6} = 41.66 \text{ W} \)


  • This safely rounds to 42 W.


Why other options are incorrect:

If you fail to convert minutes to seconds, you calculate 2500 / 1 = 2500 W (Option D). Option C results from flawed mental math.

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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