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JEE Main201910 Jan 2019Evening ShiftPhysicsMathematics in PhysicsActual

The diameter and height of a cylinder are measured by a meter scale to be 12.6 ± 0.1   c m and 34.2 ± 0.1   c m , respectively. What will be the value of its volume in appropriate significant figures?

Options

  1. A4264 ± 81 c m 3
  2. B4264.4 ± 81.0 c m 3
  3. C4260 ± 80 c m 3
  4. D4300 ± 80 c m 3

Correct answer

C. 4260 ± 80 c m 3

Step-by-step solution

V = π d 2 h 4 = π 4 12.6 2 34.2   c m 3 d V V = 2 d d d + d h h Converting to errors ∆ V V = 2 ∆ d d + ∆ h h ∆ V 4260 = 2 0.1 12.6 + 0.1 34.2 ⇒ ∆ V = 80   c m 3 V = 4260 ± 80   c m 3

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