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JEE MAIN 2022
26-07-2022 S1
Question
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]
Select the correct option:
A
6.8 $\mathrm{cm}^2$
B
$3.4 \mathrm{~cm}^2$
C
$3.9 \mathrm{~cm}^2$
D
$2.4 \mathrm{~cm}^2$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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