Question

In which of the following instrument used in the lab there exists an error of random category known as back lash error; (i) Screw gauge (ii) Micrometer (iii) Searle’s apparatus
(iv) Vernier calipers

• A. (i) and (ii) only
• B. (i) ,(ii) and (iii) only
• C. (i) only
• D. All four

Answer 1

The correct option is B (i) ,(ii) and (iii) only

This error occur in all the instruments which utilizes screw or nut-bolt system