The flatness of a machine bed can be measured using (A) Vernier calipers (B) Auto collimator (C) Height gauge (D) Tool maker's microscope
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Which of the following is the most precise device for measuring length? (a) A vernier callipers with 20 divisions on the sliding scale (b) A screw gauge of pitch $1 \mathrm{~mm}$ and 100 divisions on the circular scale (c) An optical instrument that can measure length to within a wavelength of light? (d) All are equally precise device for measuring length
Units and Measurements
Round 1
Which of the following is the most precise device for measuring length: (a) a vernier callipers with 10 divisions on the sliding scale (b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale
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