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The atmospheric pressure is measured wit...

The atmospheric pressure is measured with a Fortin's barometer having a vernier scale. 20 divisions of the vernier scale coincide with 19 main scale divisions. Each division of the main scale is equal to 0.5 mm. Which of the following correctly expresses the atmospheric pressure ?

A

71.0000 cm of Hg

B

71.000 сm of Hg

C

71.00 cm of Hg

D

71.0 cm of Hg

Text Solution

Verified by Experts

The correct Answer is:
A
Least count of vernier scale `=(0.5)/(20)` mm=0.0025 cm
It has significant digits upto four place of decimal. In observation 71.0000 cm of Hg also, there are four significant digits after the decimal point.
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