105.Which of the following is the most prescise device for measuring length ? (a) a vernier callipers with 20 divisions on the sliding scale (b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale (c) an optimal instrument that can measure length to within a wavelength of light Also explain the reason .

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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 mm and 100 divisions on the circular scale

Q. On the basis of details given about two measuring instruments, select the correct statement .

(i) Vernier callipers having main scale division=0.05 cm and Vernier scale division

= \frac{2.45}{50}

cm

(ii) Screw gauge having pitch 0.5 mm and its circular scale has 50 divisions

Q. Volume of a cylindrical wire is measured with the help of a simple scale with 10 divisions per centimeter to measure length and a screw gauge with 100 divisions on circular scale with a pitch of 1 mm to measure the diameter. If length is 20 cm and diameter is 1 mm, then percentage error in volume is

Consider a Vernier calipers in which each $1 c m$ on the main scale is divided into $8$ equal divisions and a screw gauge with $100$ divisions on its circular scale. In the Vernier callipers, $5$ divisions of the Vernier scale coincide with $4$ divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then

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