Question

Which one of the following is vector quantity ?
(a) Speed
(b) Mass
(c) Velocity​

Answer 1

Answer- The above question is from the chapter 'Vectors'.

Let's know about vectors and scalars first.

Physical quantity: A quantity that can be measured is called a physical quantity.

Example: mass, length, area, volume, speed, etc.

Vector quantity: A physical quantity which possesses both magnitude and direction is called a vector quantity.

Example: velocity, acceleration, force, weight, etc.

Scalar quantity: A physical quantity which possesses only magnitude is called a scalar quantity.

Example: speed, temperature, mass, density, etc.

Given question: Which one of the following is a vector quantity ?

(a) Speed

(b) Mass

(c) Velocity​

Answer: Velocity is a vector quantity as it contains both magnitude and direction.

∴ (c) Velocity​ is the correct option.

Answer 2

(c) Velocity is a vector quantity.

Explanation for the answer:

• Velocity is the change in displacement with respect to time.
• Velocity is a vector quantity as it is the speed of an object in a particular direction.
• It has both magnitude as well as direction.
• Hence, the correct answer among all the options is option (c) Velocity .

Explanation for Incorrect answers:

• Speed is a scalar quantity as it is the rate of change in the distance travelled by an object.
• Mass is a scalar quantity as it has only magnitude, not direction.

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