Chemistry Thermochemistry NUMS 2022
PMDC Verified Question 49 of 81
One Calorie is equivalent to:
A
\( 0.4184 \text{ J} \)
B
\( 4.184 \text{ J} \)
C
\( 4.184 \text{ KJ} \)
D
\( 0.4184 \text{ KJ} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 4.184 \text{ J} \)
Concept:

The calorie (cal) is defined historically based on the thermal properties of water. It is a fundamental conversion factor in thermodynamics to transition to the SI unit of energy (Joule).

Formula:

$$ 1 \text{ cal} = 4.184 \text{ J} $$

Solution:

  • By strict international definition, one standard thermochemical calorie is exactly \( 4.184 \text{ Joules} \).


  • This is derived from the specific heat capacity of water.


Why other options are incorrect:

Option A has a decimal error. Option C uses Kilojoules (which would equal 4184 Joules). Option D is \( 0.4184 \text{ KJ} \), which equals 418.4 Joules, not 4.184.

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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