Question

Which of the following is the most precise instrument for measuring length?

• A. Metre rod of least count $0.1\, cm$
• B. Vernier callipers of least count $0.01 \,cm$
• C. Screw gauge of least count $0.001 \,cm$
• D. None of these

Answer 1

Answer: (C)

Screw gauge of least count $0.001 \,cm$

Answer 2

Screw gauge has minimum least count of $0.001\, cm$. Hence, it is most precise instrument.