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Screw gauge reading, corrected for zero error

This type of question, asked 8 times: 2021 Paper 3, 2021 Paper 18, 29 Jul 2022, 30 Jan 2023, 6 Apr 2024, 8 Apr 2024, 23 Jan 2026 S1, 2 Apr 2026 S2. All 8 questions below, oldest first.

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  1. Question 1

    2021 Paper 3

    14
    The pitch of the screw gauge is 1 mm1\text{ }mm and there are 100 divisions on the circular scale. When nothing is put in between the jaws, the zero of the circular scale lies 8 divisions below the reference line. When a wire is placed between the jaws, the first linear scale division is clearly visible while 72nd 72^{\text{nd~}} division on circular scale coincides with the reference line. The radius of the wire is :

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  2. Question 2

    2021 Paper 18

    15
    In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 50 divisions on the circular scale, and the main scale moves by 0.5 mm0.5\text{ }mm on a complete rotation. For a particular observation the reading on the main scale is 5 mm5\text{ }mm and the 20th 20^{\text{th~}} division of the circular scale coincides with reference line. Calculate the true reading.

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  3. Question 3

    29 Jul 2022

    20
    In an experiment to find out the diameter of wire using screw gauge, the following observation were noted: (A) Screw moves 0.5 mm0.5\text{ }mm on main scale in one complete rotation (B) Total divisions on circular scale =50= 50 (C) Main scale reading is 2.5 mm2.5\text{ }mm (D) 45th 45^{\text{th~}} division of circular scale is in the pitch line (E) Instrument has 0.03 mm0.03\text{ }mm negative error Then the diameter of wire is:

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  4. Question 4

    30 Jan 2023

    27
    In a screw gauge, there are 100 divisions on the circular scale and the main scale moves by 0.5 mm0.5\text{ }mm on a complete rotation of the circular scale. The zero of circular scale lies 6 divisions below the line of graduation when two studs are brought in contact with each other. When a wire is placed between the studs, 4 linear scale divisions are clearly visible while 46th 46^{\text{th~}} division the circular scale coincide with the reference line. The diameter of the wire is_____ ×10−2 mm\times10^{- 2}\text{ }mm

  5. Question 5

    6 Apr 2024

    7
    While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm1\text{ }mm and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm1\text{ }mm and it has 100 divisions on circular scale. The diameter of the wire is x50 mm\frac{x}{50}\text{ }mm. The value of xx is:

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  6. Question 6

    8 Apr 2024

    106
    There are 100 divisions on the circular scale of a screw gauge of pitch 1 mm1\text{ }mm. With no measuring quantity in between the jaws, the zero of the circular scale lies 5 divisions below the reference line. The diameter of a wire is then measured using this screw gauge. It is found the 4 linear scale divisions are clearly visible while 60 divisions on circular scale coincide with the reference line. The diameter of the wire is:

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  7. Question 7

    23 Jan 2026 S1

    19
    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 ]

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  8. Question 8

    2 Apr 2026 S2

    7
    In 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 scale and pitch of screw gauge is 0.1 mm . When diameter of a sphere is measured, the reading of main scale is 5 mm and 50th 50^{\text{th~}} division of circular scale coincides with the reference line of main scale. The diameter of sphere is ____\_\_\_\_ mm.

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