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प्रश्न
Explain the use of a screw gauge and vernier caliper in measuring smaller distances.
उत्तर
Measurement of small distances: screw gauge and vernier caliper Screw gauge:
The screw gauge is an instrument used for measuring accurately the dimensions of objects up to a maximum of about 50 mm. The principle of the instrument is the magnification of linear motion using the circular motion of a screw. The least count of the screw gauge is 0.01 mm. Vernier caliper: A vernier caliper is a versatile instrument for measuring the dimensions of an object namely the diameter of a hole, or a depth of a hole. The least count of the vernier caliper is 0.1 mm.
Screw Gauge
(a) No error
(b) +ve error
(c) - ve error
(d) screw gauge reading
A Model reading
PSR = 6 mm; HSC = 40 divisions;
Reading = [6 mm + (40 × 0.01 mm) = 6.40 mm]
Vernier Caliper
(a) No error
(b) +ve error
(c) - ve error
(d) Vernier reading
A model reading
MSR = 2.2 cm ; VSC = 4 divisions;
Reading = [2.2 cm + (4 × 0.01cm)] = 2.24 cm
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