Physics Force & Motion NUMS 2023
PMDC Verified Question 50 of 137
In perfectly elastic collision:
A
Only momentum is conserved
B
only total energy is conserved
C
Only kinetic energy is conserved
D
momentum, kinetic energy and total energy, all are conserved
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: momentum, kinetic energy and total energy, all are conserved
Concept:

Classification of collisions rests entirely on conservation laws.

Solution:

  • In EVERY closed system, total universal energy and total momentum are strictly conserved regardless of the collision type.


  • A "perfectly elastic" collision is specifically uniquely defined by the additional fact that macroscopic Kinetic Energy is also perfectly conserved.


  • Therefore, all three quantities (momentum, total energy, kinetic energy) are strictly conserved.


Why other options are incorrect:

Options A, B, and C use the word "only", artificially restricting conservation laws that apply concurrently.

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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