Question

Which of the following quantities are vectors.

• A. 1, 2, 3
• B. 1, 2, 5 and 6
• C. 3, 4
• D. 4, 5, 6

Answer 1

The correct option is C

3, 4

A vector has both magnitude and direction.

1. 70 $c{m}^3$ – Volume – No direction, only magnitude
2. 5 m/s – speed – Direction not specified
3. 8 m/s NE – Speed 8 m/s + Direction which is North East. So a vector quantity.
4. 70 cm to the right - Magnitude = 70 cm Direction – To the right Hence a vector quantity
5. ${25}^{\circ }C$ – Temperature – Only magnitude no direction
6. 30 N (force) – The direction in which the force is applied has not been specified So it’s not a vector.