Physics Work & Energy MDCAT 2018
PMDC Verified Question 82 of 108
Energy consumed by 60-watt bulb in 2 minutes is equal to
A
7.2 kilo joules
B
120 joules
C
720 joules
D
72000 joules
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 7.2 kilo joules
Concept:

Electrical energy consumed is calculated by multiplying the power rating by the time in seconds.

Formula:

$$ E = P \times t $$

Solution:

  • Power (\( P \)) = 60 W


  • Time (\( t \)) = 2 minutes = \( 2 \times 60 = 120 \text{ seconds} \)


  • \( E = 60 \times 120 = 7200 \text{ Joules} \)


  • Convert to kilo-joules: \( 7200 \text{ J} = 7.2 \text{ kJ} \)


Why other options are incorrect:

Failing to convert minutes to seconds yields \( 60 \times 2 = 120 \text{ J} \) (Option B). Dropping a zero yields 720 J (Option C).

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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