The least count of a vernier calliper in which 19 (19 mm) main scale divisions are divided into 20 equal divisions in the vernier scale will be

  1. 0.05
  2. 0.019
  3. 0.01
  4. 0.02

Answer (Detailed Solution Below)

Option 1 : 0.05
Free
NMDC Maintainance Assistant: Electrical Power System Quiz
0.7 K Users
5 Questions 5 Marks 5 Mins

Detailed Solution

Download Solution PDF

Concept:

The Vernier principle states that two different scales are constructed on a single known length of line and the difference between them is taken for fine measurements.

Determining the least count of Vernier callipers:

In the Vernier calliper shown in Fig the main scale divisions (9 mm) are divided into 10 equal parts in the Vernier scale. i.e.

5bdab6c085f97b1bd68407af

One main scale division (MSD) = 1 mm

One Vernier scale division (VSD) = 9/10 mm

Least count = 1 MSD - 1 VSD

= 1 mm - 9/10 mm = 0.1 mm

The difference between one MSD and one VSD = 0.1 mm

Calculation:

LC = 1 MSD – 1 VSD = 1mm – 19/20 mm = 1/20 mm =  0.05 mm
Latest NMDC Maintenance Assistant Updates

Last updated on May 25, 2025

-> NMDC recruitment 2025 application form has been released at the official website. 

-> The NMDC recruitment 2025 notification has been released for the Maintenance Assistant.

-> A total of 446 vacancies are announced for Maintenance Assistant recruitment.

-> Candidates can fill NMDC recruitment 2025 form till June 14. 

-> The selection of the candidates depends on two stages, which are the Written Test and Trade Test. 

-> The selected candidates for Maintenance Assistant will get an NMDC Maintenance Assistant Salary of Rs. 18,000 to Rs. 31,850.

-> Candidates appearing in the exam can refer to the NMDC Maintenance Assistant syllabus and exam pattern

Get Free Access Now
Hot Links: teen patti plus all teen patti game teen patti master 51 bonus