A physical quantity that has magnitude only.

A physical quantity that has magnitude only.

• A. Scalar
• B. Vector
• C. Tensor
• D. Magnitude

Answer: (A)

A scalar is a physical quantity described completely by its magnitude, with no direction attached. That means you can specify it with a single number and a unit, like mass (5 kg), temperature (20°C), distance (12 m), or time (30 s). There’s no orientation involved, so changing direction doesn’t change the value. In contrast, a vector requires both magnitude and direction, such as a velocity of 5 m/s north, which adds directional information. A tensor generalizes further to handle quantities that depend on direction in multiple dimensions. The term magnitude itself refers to the size or length of something, often the scalar value associated with a quantity, but it isn’t a separate category of physical quantity. So the quantity that has magnitude only is a scalar.

A scalar is a physical quantity described completely by its magnitude, with no direction attached. That means you can specify it with a single number and a unit, like mass (5 kg), temperature (20°C), distance (12 m), or time (30 s). There’s no orientation involved, so changing direction doesn’t change the value. In contrast, a vector requires both magnitude and direction, such as a velocity of 5 m/s north, which adds directional information. A tensor generalizes further to handle quantities that depend on direction in multiple dimensions. The term magnitude itself refers to the size or length of something, often the scalar value associated with a quantity, but it isn’t a separate category of physical quantity. So the quantity that has magnitude only is a scalar.