Physics Work & Energy ETEA 2018
PMDC Verified Question 87 of 108
A man carries a 1 kg body 10m horizontally on a level ground. The work done by the man is:
A
10 J
B
1 J
C
0 J
D
5 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: 0 J
Concept:

Work is calculated as the dot product of force and displacement. When moving horizontally at constant speed, the applied lifting force is upward (against gravity), while the displacement is horizontal.

Formula:

$$ W = Fd \cos \theta $$

Solution:

  • The force holding the object up is vertical.


  • The displacement is horizontal.


  • The angle \( \theta \) between force and displacement is 90°.


  • \( \cos(90^{\circ}) = 0 \)


  • \( W = Fd(0) = 0 \text{ J} \)


Why other options are incorrect:

Multiplying mass and distance (1 x 10) yields 10, which incorrectly assumes the force and displacement are in the same direction.

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.

Previous Question All Work & Energy MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App