A physical quantity which is completely described by a number with proper units is called:
Correct answer: A. Scalar
- A. Scalar
- B. Vector
- C. Null vector
- D. None of the above
Explanation
A scalar is a physical quantity that has only magnitude and is completely described by a single numerical value along with appropriate units. Scalars are characterized by their magnitude (size) and do not have a direction associated with them. Examples of scalars include distance, speed, mass, temperature, and time.
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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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