Physics Work & Energy PMDC 2021
PMDC Verified Question 72 of 108
2kg mass is uplifted by the machine through the height of 200m for 10 sec calculate power deliver to the load. (\( g = 10 \text{m/s}^2 \))
A
40W
B
400W
C
440W
D
200W
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 400W
Concept:

Power output for lifting is the gravitational potential energy gained divided by the time taken.

Formula:

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

Solution:

  • Mass (\( m \)) = 2 kg


  • Gravity (\( g \)) = 10 \( \text{m/s}^2 \)


  • Height (\( h \)) = 200 m


  • Time (\( t \)) = 10 s


  • Work Done = \( mgh = 2 \times 10 \times 200 = 4000 \text{ J} \)


  • Power = \( \frac{4000}{10} = 400 \text{ W} \)


Why other options are incorrect:

Omitting gravity gives 40 W. Using an incorrect height or time gives extraneous results.

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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