Physics Work & Energy ETEA 2023
PMDC Verified Question 28 of 108
The weight of a body is 120 N and it is lifted to height 10m, work done on the body is:
A
120 J
B
100 J
C
1000 J
D
1200 J
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 1200 J
Concept:

Work done in lifting a body is equal to the force applied (which must equal the body's weight) multiplied by the vertical height.

Formula:

$$ W = F \times d = (Weight) \times h $$

Solution:

  • Notice the problem gives "Weight = 120 N". You do not need to multiply by gravity again; weight is already \( mg \).


  • Height (\( h \)) = 10 m


  • \( W = 120 \text{ N} \times 10 \text{ m} = 1200 \text{ Joules} \).


Why other options are incorrect:

Option A assumes distance is 1. Options B and C are fabricated arithmetic.

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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