Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202126 AugustMorning Shift
Exam
JEE Main
Year
2021
Date
26 August
Shift
Morning Shift
Subject
Physics
Chapter
Experimental Physics

JEE Main 2021 · 26 August · Morning Shift · Physics · Experimental Physics

In a Screw Gauge, fifth division of the circular scale coincides...

In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 5050 divisions on the circular scale, and the main scale moves by 0.5mm0 . 5mm on a complete rotation. For a particular observation the reading on the main scale is 5mm5mm and the 20th{20}^{\text{th}} division of the circular scale coincides with reference line. Calculate the true reading.

Options

  1. A5.20mm5 . 20mm
  2. B5.00mm5 . 00mm
  3. C5.15mm5 . 15mm
  4. D5.25mm5 . 25mm

Correct answer

C. 5.15mm5 . 15mm

Step-by-step solution

L.C. of screw Gauge=0.550=0.01mm= \dfrac{0 . 5}{50} = 0 . 01mm
Zero error of screw Gauge =5×L.C.= 5 \times L . C .=5×0.01=0.05mm= 5 \times 0 . 01 = 0 . 05mm
Reading of screw gauge = main scale reading ++ circular scale reading ×L.C.−\times L . C . -Zero error =5+(20×0.01)−0.05=5.15mm= 5 + \left(20 \times 0 . 01\right) - 0 . 05 = 5 . 15mm
Practice Experimental Physics on Quantrex Academy →

More from Experimental Physics

Two thin wires, Wire-1 of diameter 0.650 mm and Wire-2 of unknown diameter d are given.… JEE Advanced 2026In a Vernier calipers, when both jaws touch each other, zero of the Vernier scale is… JEE Main 2026In a screw gauge when the circular scale is given five complete rotations it moves… JEE Main 2026In a screw gauge the zero of main scale reference line coincides with the fifth division… JEE Main 2026In an experiment, a set of reading are obtained as follows - 1.24 ~mm, 1.25 ~mm, 1.23 ~mm… JEE Main 2026When both jaws of vernier callipers touch each other, zero mark of the vernier scale is… JEE Main 2026In a vernier callipers, 50 vernier scale divisions are equal to 48 main scale divisions.… JEE Main 2026In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal… JEE Main 2026 Full Experimental Physics list All JEE Main PYQs