Question

A screw gauge have 250 equal divisions marked along the periphery of circular scale. If one full rotation gives advancement of 0.625cm, the least count of the arrangement is –

• A. 2.5 × 10^–4 cm
• B. 2.5 × 10^–2 cm
• C. 2.5 × 10^–3 cm
• D. None of these

Answer 1

Answer: (C)

2.5 × 10^–3 cm

Answer 2

L.C. = $\frac { 0.625 } { 250 }$ = 2.5 × 10^–3 cm