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 1.5 mm and circular scale reading is 7. The calculated curved surface area of wire to appropriate significant figures is : [Screw gauge has 50 divisions on the circular scale]
Text Solution
Verified by ExpertsThe correct answer is:
B
Length of wire = 6.8 cm
Diameter of wire =1.5 mm + 7 x L.C
= 1.5mm + 7 x .01 = 1.57mm
Curved surface area = 
= 3.14 x 6.8 x 1.57 x 10 -1 cm 2
= 3.352 cm 2 = 3.4 cm 2
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