Chemistry Thermochemistry PMC 2021
PMDC Verified Question 50 of 81
Unit of energy:
A
Kilojoule
B
Joule
C
Calorie
D
All
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: All
Concept:

Energy, whether it is heat, work, or internal energy, can be measured using multiple metric and non-metric unit systems depending on the scientific context.

Formula:

$$ 1 \text{ Calorie} = 4.184 \text{ Joules} = 0.004184 \text{ Kilojoules} $$

Solution:

  • The Joule (J) is the standard SI unit of energy.


  • The Kilojoule (kJ) is simply a multiple of the Joule (\( 1000 \text{ J} \)), commonly used to express molar enthalpies.


  • The Calorie (cal) is the traditional CGS unit of heat energy.


  • Since all three are valid units of energy, the correct answer is All.


Why other options are incorrect:

Selecting only A, B, or C would be incomplete as all the listed terms are valid energy units.

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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