Selina Solutions Class 9 Physics Solutions for Exercise 1B in Chapter 1 - Chapter 1 – Measurements and Experimentation

Question 17 Exercise 1B

A boy uses vernier callipers to measure the thickness of his pencil. He measures it to be 1.4mm. If the zero error of vernier callipers is +0.02cm, what is the correct thickness of pencil?


Given: Thickness of the pencil = 1.4mm

Zero error = +0.02cm

Actual thickness =?

Correct reading = observed reading – zero error

= 1.4mm – 0.02cm

= 1.4mm – 0.2mm

= 1.2mm

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