Which measurement is most precise?
Vernier Callipers having `20` divisions on sliding scale, or Vernier Callipers having `25` divisions on sliding scale.

Which measurement is most precise? Vernier Callipers having 10 divisions on sliding scale or Vernier Callipers having 20 divisions on sliding scale.

Which measurement is most precise? Vernier Callipers having 5 divisions on sliding scale, or Vernier Callipers having 10 divisions on sliding scale.

Which of the following is the most precise device for measuring length ? (a) a vernier calliper with 20 divisions on the sliding scale, coinciding with 19 main scale divisions (b) a screw gauge of pitch 1mm and 100 divisions on the circular scale (c ) an optical instrument that can measure length to within a wavelength of light.