Physics Work & Energy MDCAT 2019
PMDC Verified Question 80 of 108
An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If that force is double with the velocity remaining constant what happens to its total power?
A
It does not change
B
It is halved
C
It is squared
D
It is doubled
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: It is doubled
Concept:

Power output is directly proportional to both the force exerted and the velocity at which the object moves.

Formula:

$$ P = F \times v $$

Solution:

  • Initial Power \( P = Fv \)


  • New Force = \( 2F \)


  • Velocity remains \( v \)


  • New Power \( P' = (2F)v = 2(Fv) = 2P \)


  • Thus, the power is doubled.


Why other options are incorrect:

Since the relationship is strictly linear, doubling one variable (while keeping the other constant) doubles the product. It does not square it or halve it.

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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