Verified Solution • 2025–26 Session moderate

QJEEM20Ph15e4: JEE Main 2020 Physics - Class 11 JEEM20Ph15e4 Solution: If the screw on a screw-gauge is given six rotations, it moves…

If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is :

Multiple Choice Options

  • A 0.001 mm
  • B 0.01 cm
  • C 0.02 mm
  • D 0.001 cm

Step-by-Step Verified Solution

Pitch = 36{3 \over 6} mm = 0.5 mm

Least count = 0.550{{0.5} \over {50}} mm

= 1100{1 \over {100}} = 0.01 mm = 0.001 cm

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