Question

Which of the following is a scalar quantity?
1. Momentum
2. Force
3. Volume
4. Weight
5. None of the above/More than one of the above.

Answer 1

Correct Answer - Option 3 : Volume

CONCEPT:

Scalar quantities:

• The physical quantities which have only magnitude and no direction are called scalar quantities or scalars.
• A scalar quantity can be specified by a single number, along with the proper unit.
• Examples: Mass, volume, density, time, temperature, electric current, etc.

 

Vector quantities:

• The physical quantities which have both magnitude and direction and obey the laws of vector addition are called vector quantities or vectors.
• A vector quantity is specified by a number with a unit and its direction.
• Examples Displacement, velocity, force, momentum, etc.

EXPLANATION:

• Scalars are the quantities that are described by a magnitude alone. Example - Speed, Volume, Mass.

• Volume is a scalar quantity, having only magnitude and giving no information about the direction.
• Force and displacement are two vector quantities, the dot product of two vectors gives us a scalar hence energy is a scalar.
• Velocity is a physical vector quantity; both magnitude and direction are needed to define it.