Physical quantities represented by magnitude are called:

Explanation

(a) Scalar: Scalar quantities are physical quantities that are fully described by their magnitude or size. Examples of scalar quantities include temperature, mass, and time. (b) Vector: Vector quantities are physical quantities that have both magnitude and direction. They require both a numerical value and a specified direction to fully describe them. Examples of vector quantities include displacement, velocity, and force. (c) Functions: Functions are mathematical entities that describe the relationship between two or more variables. While functions can be used to model physical phenomena, they are not directly related to the representation of physical quantities by magnitude. (d) None of the above: This option indicates that none of the given choices accurately describe the representation of physical quantities by magnitude. In the context of the question, the correct answer is (a) scalar, as scalar quantities are represented by magnitude alone.