Physics Work & Energy BUMHS 2024
PMDC Verified Question 17 of 108
If a force of one Newton acts on a body and displaces it through a distance of one meter in the direction of force then work done is one
A
joule
B
dyne
C
erg
D
watt
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: joule
Concept:

This statement is the exact, standard SI definition of the unit of energy and work.

Formula:

$$ 1 \text{ Joule} = 1 \text{ Newton} \times 1 \text{ meter} $$

Solution:

  • Force = 1 N


  • Displacement = 1 m


  • Direction is the same (\( \cos 0^{\circ} = 1 \))


  • Work = \( 1 \times 1 = 1 \text{ N}\cdot\text{m} \).


  • The name for \( 1 \text{ N}\cdot\text{m} \) is 1 Joule.


Why other options are incorrect:

Erg is the CGS unit of work (dyne-centimeter). Dyne is a CGS unit of force. Watt is a unit of power (Joules/sec).

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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