Answer :

In this question, three measuring/ calibrating instruments are given. Among these devices, we have to find the most precise device.

To find the most precise device we have to calculate the Least Count of these devices.

(a). Least count of Vernier calliper =

= = 0.05 mm

= 0.05 cm

(b). Least count (L.C) of screw gauge =

Pitch = 1 mm

No. of division on circular scale = 100

L.C = 1 × 10-3 ×

= 0.01 cm

(c). Least count of optical instrument that can measure length to within a wavelength of light is about 0.00001 cm

Here optical instrument has least count among given instruments. So Optical instrument is the most precise device for measuring length.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

Time for 20 oscilPhysics - Exemplar

The radius of a cHC Verma - Concepts of Physics Part 1

It is claimNCERT - Physics Part-I

Measure of two quPhysics - Exemplar

A physical quantiPhysics - Exemplar

Express unified aPhysics - Exemplar

The Vernier scalePhysics - Exemplar

The mass and voluPhysics - Exemplar

<span lang="EN-USHC Verma - Concepts of Physics Part 1