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Units and Measurements · Question 46

JEE Main 2025 (Online) 28th January Morning ShiftNumericalEasy📈 Topic in 26% papers+4
1

A tiny metallic rectangular sheet has length and breadth of 5 mm and 2.5 mm, respectively. Using a specially designed screw gauge which has pitch of 0.75 mm and 15 divisions in the circular scale, you are asked to find the area of the sheet. In this measurement, the maximum fractional error will be x100 where x is .

Answer

3

Solution

Least count = pitchno. of divisions = 0.7515 = 0.05 mm

l = b = 0.05 mm

A = lb AA = ll + bb

= 0.055 + 0.052.5 = 0.01 + 0.02 = 3100

x = 3

Answer: 3

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2

Match List - I with List - II. Choose the correct answer from the options given below:

  1. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
  2. (A)-(I), (B)-(III), (C)-(IV), (D)-(II)
  3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
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