Question

Prepare and upload ruler of least count 0.2 cm.​

Answer 1

Explanation:

To make a paper scale of given least count, e.g., 0.2 cm, 0.5 cm.

Apparatus

A thick white paper sheet, pencil, scale with sharp edge marked in cm and mm, fevicol, a pair of scissors, a paper cutter, thick ivory sheet used by engineering students.

Theory

Least count. The minimum observation that can be measured by the instrument accurately is called the least count of instrument.

Range of an instrument. The maximum observation that can be measured by instrument is called its range.

A) Paper scale of least count 0.2 cm

Fold a white paper sheet in the middle along lengthwise.

Mark in the upper half along the length a line PQ 15 cm long by a sharp pencil (Fig. A).

Take P as zero mark points on PQ at a distance of 1.0 cm and write as 0,1, 2,……up to 15.

Mark the vertical lines to line PQ at the position of each mark 0, 1, 2,……up to 15.

Draw another sharp line RS which is parallel to PQ at a distance of 8 mm.

Draw another line XY parallel to PQ at a distance of about 25 mm. And complete the rectangle ABXY.

Now divide each 1.0 cm interval into five equal divisions on PQ by marking points at every interval of 2 mm. Mark these points up to 15 cm mark.

Now draw sharp small lines about 3 mm long perpendicular to PQ on each of the point which is separated by 2 mm.

Draw another line AB parallel to PQ at a gap of 3 mm.

Darken each line and division by the sharp black pen, and write 1,2,……15 at each cm mark.

Cut the rectangular scale by a sharp paper cutter and paste it on a thick ivory sheet and cut the sheet along the boundary of the rectangle with the help of scissors.

Paper scale of least count 0.2 mm and of the range of 15 cm is ready.