JAMB Physics 2024 Paper

Concept:The degree of precision of a vernier caliper is its least count, which is the smallest measurement it can read accurately.Explanation:A standard vernier caliper divides $1\,\text{cm}$ into $10$ main scale divisions and uses a vernier scale with $10$ divisions that match $9$ main scale divisions.So, the least count $= \frac{1\,\text{main scale division}}{10} = \frac{0.1\,\text{cm}}{10} = 0.01\,\text{cm}$.This means it can measure accurately to the nearest hundredth of a centimetre.Therefore, the degree of precision is $0.01\,\text{cm}$, which corresponds to option B.Answer:B. $0.01\,\text{cm}$