Scalars vs. Vectors: Identifying Misclassifications

Steps:

• Define vectors as quantities with both magnitude and direction; scalars as having magnitude only.
• Examine each statement to see if it accurately identifies a vector and provides a valid reason.
• Eliminate options where the quantity is truly a vector with correct justification.
• Select the option that wrongly labels a scalar as a vector.

Why A is correct:

• Temperature is a scalar quantity by definition in physics, possessing only magnitude; positive or negative values denote intensity, not spatial direction like vectors (e.g., displacement).

Why the others are wrong:

• B: Acceleration is a vector, correctly justified by having both magnitude and direction, per Newton's laws.
• C: Time is a scalar with magnitude only; "forwards direction" refers to the arrow of time, not vector properties like reversible direction.
• D: Weight, as a gravitational force (W = mg), is a vector with downward direction toward Earth's center.

Final answer: A