Question

Select the scalar quantity

• A. Pressure
• B. Force
• C. Velocity
• D. Acceleration

Hint:

Ask whether the quantity needs a direction to be fully described.

Answer 1

The Correct Option is A

Ask one simple question for each quantity: does it need a direction to be fully described, or does a number with a unit say everything?

1. Force pushes or pulls in a certain direction, so you must state its direction. It is a vector.
2. Velocity tells you how fast something moves and in which direction it moves. It is a vector.
3. Acceleration tells you how velocity changes, and that change also has a direction. It is a vector.
4. Pressure is force spread over an area, given simply as a number of pascals. There is no direction attached to the reading itself.

Since pressure needs only a magnitude to be fully specified, it is the scalar quantity here, confirming option A.