In 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 of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is ______ mm.
[Assume least count is 0.01 mm]
[Assume least count is 0.01 mm]
- (A)1.50
- (B)1.48
- (C)1.54✓ Correct
- (D)1.51
Answer: (C)
Solution
The zero of the circular scale lying 3 divisions above the pitch line corresponds to a negative zero error, mm. The observed reading is mm. The true thickness is obtained by subtracting the zero error, mm. The correct thickness of the sheet is mm.
JEE Main · 2026 · 23 Jan 2026 · Shift 1 · Single correct option