Measurement Using Screw Gauge

Q.

A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the ${45}^{th}$ division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet, if the main scale reading is 0.5mm and the ${25}^{th}$ division coincides with the main scale line?

1. 0.75 mm

2. 0.80 mm

3. 0.70 mm

4. 0.50 mm

Q.

A screw gauge has$50$ divisions on its circular scale. The circular scale is$4units$ ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of$0.5mm$ is noticed on the pitch scale. The nature of zero error involved and the least count of the screw gauge, are respectively:

1. Positive, $0.1mm$

2. Positive, $0.1\mu m$

3. Positive, $10\mu m$

4. Negative, $2\mu m$

Q.

How do you know if a micrometer has zero error?

Q.

What is the difference between a vernier caliper and a screw gauge?

Q.

Draw neat labeled diagrams of a Vernier caliper showing the position of external and internal jaws in the measurement of exterior and interior dimensions.

Q.

What is the SI unit of mass?

1. 3

2. 10

3. 4

4. 7

Q. Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of -0.03 mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is:

1. 3.67 mm
2. 3.38 mm
3. 3.32 mm
4. 3.73 mm

Q.

A student is trying to measure the diameter of a lead shot using a screw gauge. The pitch of the screw gauge is 1 mm and has 50 divisions on its circular scale. When the two jaws of the screw gauge are in contact with each other, the zero of the circular scale lies 6 division below the line of graduation. When the lead shot is placed between the jaws, 3 linear scale divisions are clearly visible while 31^st division on the circular scale coincides with the reference line. The diameter of the lead shot is:

1. 3.55 mm

2. 3.50 mm

3. 3.62 mm

4. 3.74 mm

Q.

In a screw gauge zero of the head scale lies above the pitch scale axis, the zero error is:

1. zero

2. negative

3. positive

4. depends on the thickness to be measured

Q. nta barrometer tube reads 75 cm of Hg. if tube is gradually inclined at an angle of 30 degree with horizontal, keeping the open end in the mercury container, then find the length of mercury column in the barrometer tube.n

Q.

The thimble of a screw gauge has $100$divisions. The spindle advances$2mm$ when the screw is turned through four revolutions. What is the least count of the screw gauge?

1. $0.0005cm$

2. $0.005cm$

3. $0.050m$

4. $0.050mm$

Q.

For the screw gauge shown below, the least count is 0.01 mm. What is the zero correction?

1. – 0.95 mm

2. + 0.95 mm

3. - 0.05 mm

4. + 0.05 mm

Q. Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of -0.03 mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is:

1. 3.32 mm
2. 3.73 mm
3. 3.67 mm
4. 3.38 mm