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PracticalKida.com Practical No. 02: Measurements of dimensions of given objects by micrometer screw gauge. Pitch of the screw (p): 0.5 cm Total number of divisions on the circular scale (n): 100 Least count (LC): LC = p / n = 0.5 cm / 100 = 0.005 cm Zero error: 0.00 cm Zero error correction (z): 0.00 cm Observations: Objec t Dimens ion MS R (cm ) CS D CS R (cm ) TR (cm ) Zero Error Correctio n (z) (cm) Correcte d Reading (CR) (cm) Averag e Readin g (cm) Metall ic Spher e Diamet er (Ds) 1.2 25 0.0 25 1.2 25 -0.002 1.223 1.22
PracticalKida.com Metall ic Spher e Diamet er (Ds) 1.3 30 0.0 3 1.3 3 -0.002 1.328 Metall ic Spher e Diamet er (Ds) 1.25 28 0.0 28 1.2 78 -0.002 1.276 Block Thickn ess (t) 0.5 40 0.0 4 0.5 4 -0.002 0.538 0.54 Block Thickn ess (t) 0.6 35 0.0 35 0.6 35 -0.002 0.633 Block Thickn ess (t) 0.52 38 0.0 38 0.5 58 -0.002 0.556 Thin Metall ic Wire Diamet er (Dw) 0.2 45 0.0 45 0.2 45 -0.002 0.243 0.24
PracticalKida.com Thin Metall ic Wire Diamet er (Dw) 0.18 48 0.0 48 0.2 28 -0.002 0.226 Thin Metall ic Wire Diamet er (Dw) 0.21 42 0.0 42 0.2 52 -0.002 0.25 Average diameter of metallic sphere (Ds): (1.223 cm + 1.328 cm + 1.276 cm) / 3 = 1.242 cm Average thickness of block (t): (0.538 cm + 0.633 cm + 0.556 cm) / 3 = 0.576 cm Average diameter of thin metallic wire (Dw): (0.243 cm + 0.226 cm + 0.25 cm) / 3 = 0.239 cm Interpretation of results 1. Average diameter of metallic sphere (Ds): 1.242 cm 2. Average thickness of block (t): 0.578 cm 3. Average diameter of thin metallic wire (Dw): 0.239 cm
PracticalKida.com Conclusions The results obtained using the digital micrometer are very close to the previously calculated values Practical Related Questions 1. Are micrometers used in telescopes or microscopes? Answer: Micrometers are primarily used in microscopes. They are essential for making precise measurements of small objects that are visible under the microscope. While telescopes are also used for making observations of distant objects, they typically rely on different types of measurement tools, such as angular measurements for determining the position of celestial bodies. Micrometers are not as well-suited for measuring the vast distances involved in astronomical observations. 2. State the main types of screw gauges. Answer: Micrometer screw gauge: This is the most common type of screw gauge and is used to measure small dimensions with high accuracy. It typically has a least count of 0.01 mm or less.