Physics Work & Energy ETEA 2010
PMDC Verified Question 103 of 108
The heat energy dissipated by 40 watts bulb in one hour is
A
1440 J
B
14400 J
C
144000 J
D
1440 000 J
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 144000 J
Concept:

Energy dissipated is the product of power output and the time period in standard SI units (seconds).

Formula:

$$ E = P \times t $$

Solution:

  • Power (\( P \)) = 40 W


  • Time (\( t \)) = 1 hour = 3600 seconds


  • \( E = 40 \times 3600 \)


  • \( E = 144000 \text{ Joules} \)


Why other options are incorrect:

Failing to convert hours to seconds (using t=60 for minutes, etc.) or making a zero-counting error leads to options A, B, or D.

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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