A screw gauge of pitch 0.5mm is used to measure the diameter of uniform wire of length 6.8cm, the main scale reading is 1.5mm and circular scale reading is 7. The calculated curved surface area wire to appropriate significant figures is:
[Screw gauge has 50 divisions on its circular scale]
A screw gauge of pitch 0.5mm is used to measure the diameter of uniform wire of length 6.8cm, the main scale reading is 1.5mm and circular scale reading is 7. The calculated curved surface area wire to appropriate significant figures is:
[Screw gauge has 50 divisions on its circular scale]
Option 1 -
6.8 cm2
Option 2 -
3.4 cm2
Option 3 -
3.9 cm2
Option 4 -
2.4 cm2
Asked by Shiksha User
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1 Answer
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Correct Option - 2
Detailed Solution:Least count = = 0.01 mm
Diameter, d = 1.5 + 7 × 0.01
= 1.57
Surface Area = (2r)
= 3.4 cm2
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