Physics Work & Energy PMDC 2021
PMDC Verified Question 65 of 108
When a force is parallel to the direction of motion of the body, then work done on the body is
A
Zero
B
Minimum
C
Infinity
D
Maximum
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Maximum
Concept:

Work done depends on the orientation of the force relative to the direction of motion (displacement).

Formula:

$$ W = Fd \cos \theta $$

Solution:

  • "Parallel" means the force and displacement point in the exact same direction.


  • The angle \( \theta = 0^{\circ} \).


  • \( \cos(0^{\circ}) = 1 \), which is the maximum value for cosine.


  • Thus, \( W = Fd \), yielding the maximum possible work.


Why other options are incorrect:

If perpendicular (90°), work is zero. Work can never be infinite under finite force and displacement.

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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