A spherometer has a circular base of radius 3.5 cm. The central s… | JEE Main 2024 Physics PYQ

MCQEasyJEE Main 2024 · 27 January, Shift 1Vernier Calipers & Screw Gauge

A spherometer has a circular base of radius $3.5 \, \text{cm}$ . The central screw moves $2 \, \text{mm}$ for every complete rotation. How many rotations should be given to the central screw to raise it from the base by $4.2 \, \text{mm}$ ?

A
$3$
B
$5$
C
$6$
D
$7$

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