EXPLANATION
Question: Which of the following is a dimensionless quantity?
- a) Force
- b) Work
- c) Power
- d) Mole
ANSWER: d) Mole
EXPLANATION:
d) Mole
The mole (symbol: mol) is a unit used in chemistry to measure the amount of a substance. It represents a specific number of elementary entities (such as atoms, molecules, or ions) equal to Avogadro's number, which is approximately 6.022 × 10^23. The mole is a unit of quantity and does not have a dimension associated with it. Therefore, it is considered a dimensionless quantity.
On the other hand, force (a), work (b), and power (c) all have dimensions associated with them. Force is measured in Newtons (N), work is measured in Joules (J), and power is measured in Watts (W).
