Physics Work & Energy MDCAT 2010
PMDC Verified Question 100 of 108
The consumption of energy by 60-watt bulb in 2 seconds is:
A
20 J
B
30 J
C
120 J
D
0.02 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: 120 J
Concept:

Energy consumption is the product of the power of the device and the time it operates.

Formula:

$$ E = P \times t $$

Solution:

  • Given Power (\( P \)) = 60 W (which is 60 Joules/second)


  • Given Time (\( t \)) = 2 s


  • \( E = 60 \text{ J/s} \times 2 \text{ s} = 120 \text{ J} \)


Why other options are incorrect:

Dividing power by time (60/2) gives 30 J (Option B). Other options arise from incorrect arithmetic manipulation of the given numbers.

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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