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Screw Gauge

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What is the meaning of zero of circular scale division coincides with 25 divisions above reference level in screw gauge ?what is difference if it was written below in place of above?

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Q. A student measured the diameter of a small steel ball using a screw gauge of least count

0.001 c m .

The main scale reading is

5 m m

and zero of circular scale division coincides with

25

divisions above the reference level. If screw gauge has a zero error of -

0.004 c m,

the correct diameter of the ball is

Q. A student measured the diameter of a small steel ball using a screw gauge of least count

0.001 c m

. The main scale reading is

5 m m

and zero of circular scale division coincides with

25

divisions above the reference level. If screw gauge has a zero error of

- 0.004 c m

, the correct diameter of the ball is

Q. The distance moved by the screw of a screw gauge is

2 m m

in four rotations and there are

50

divisions on its cap. When nothing is put between its jaws,

30^{t h}

division of circular scale coincides with reference line, with zero of circular scale lying above the reference line. When a plate is placed between the jaws, main scale reads

2

divisions and circular scale reads

20

divisions. Thickness of plate is:

Q. Pitch of a screw gauge is 1 mm and there are 50 divisions on circular scale. When screw gauge is completely closed

28^{t h}

division of circular scale coincides with reference line. When a sheet is placed in it, the linear scale reads 2 divisions and circular scale reads 16 divisions. Zero of linear scale is visible when screw gauge is completely closed. Thickness of the sheet is:

Q. Pitch of a screw gauge is 1 mm and there are 50 divisions on circular scale. When screw gauge is completely closed

28^{t h}

division of circular scale coincides with reference line. When a sheet is placed in it, the linear scale reads 2 divisions and circular scale reads 16 divisions. Zero of linear scale is visible when screw gauge is completely closed. Thickness of the sheet is:

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