A scalar is a physical quantity which is completely specified by:
Correct answer: B. Magnitude only
- A. Direction only
- B. Magnitude only
- C. Both magnitude & direction
- D. None of these
Explanation
A scalar is a physical quantity that is completely specified by its magnitude alone. Scalars do not have direction, and they are characterized solely by a numerical value and a unit of measurement. Therefore, the correct answer is that a scalar is specified by magnitude only. The other options are incorrect because they either mention direction (which does not apply to scalars) or suggest that both magnitude and direction define a scalar, which is inaccurate.
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About Vectors and Equilibrium
Vectors have magnitude and direction, unlike scalars, and are combined by head-to-tail or parallelogram methods. Work covers rectangular components, equilibrium when the resultant force is zero, the scalar product for work and projections, and the vector product for torque and cross-product direction using the right-hand rule.
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