Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas JEE Main2020PhysicsExperimental PhysicsPractice

The length of an object is measured using a vernier system whose main scale is 30 cm long with 600 divisions. If 19 divisions of the main scale coincide with 20 divisions of the vernier scale, then its least count is

Options

  1. A0.25 c m
  2. B0.025 c m
  3. C0.35 c m
  4. D0.025 m m

Correct answer

D. 0.025 m m

Step-by-step solution

∵ Least count = MSD - VSD ∵ MSD = 30 100 600 = 5 × 10 - 4 m and VSD = 19 20 × MSD = 19 20 × 5 × 10 - 4 = 4 .75 × 10 - 4 ∴ Least count = 5 - 4 .75 × 10 - 4 = 0 .025 mm

Practice Experimental Physics on Quantrex Academy →

More from Experimental Physics

Two thin wires, Wire-1 of diameter 0.650 mm and Wire-2 of unknown diameter d are given. To obtain the value of d , the diameters of the two wires are measured with a screw gauge. T 2026In a Vernier calipers, when both jaws touch each other, zero of the Vernier scale is shifted to the right of zero of the main scale and 7^ th Vernier division coincides with a main 2026In a screw gauge when the circular scale is given five complete rotations it moves linearly by 2.5 mm. If the circular scale has 100 divisions, the least count of screw gauge is __ 2026In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are 100 divisions in circular sc 2026In an experiment, a set of reading are obtained as follows - 1.24 ~mm , 1.25 ~mm , 1.23 ~mm , 1.21 mm. The expected least count of the instrument used in recording these readings i 2026When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4^ th mark on vernier scale coincides with certain mark on 2026In a vernier callipers, 50 vernier scale divisions are equal to 48 main scale divisions. If one main scale division =0.05 ~mm , then the least count of the vernier callipers is _ _ 2026In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness 2026 Full Experimental Physics list All NTA Abhyas JEE Main PYQs