23. I measure a certain quantity and report the results in units of Newtons x metres. The
quantity is
a. a measure of work.
b. a measure of torque.
c. a measure of force.
d. not clear from the given information.
Newton-metres (N·m) primarily measures torque in physics, making option b the correct choice for this MCQ, as it represents rotational force rather than linear work or force alone.
Option Analysis
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a. a measure of work: Work equals force times displacement in the same direction, also quantified in joules (equivalent to N·m dimensionally), but conventionally distinguished from torque to avoid confusion in rotational contexts.
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b. a measure of torque: Torque arises from force applied perpendicular to a lever arm distance, directly using N·m as its SI unit, such as one newton at one metre from the pivot.
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c. a measure of force: Force uses only newtons (N), lacking the metre component, so N·m cannot represent pure force.
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d. not clear from the given information: The unit specifies torque unambiguously in standard physics, eliminating ambiguity.
This distinction aids competitive exam preparation, emphasizing context in unit interpretation.
