Q76 / 90 · JEE Main 2021 (27 Jul Shift 2) · Physics

A physical quantity y is represented by the formula y=m2r-4 gxl-32 If the percentage errors found in y, m, r, l and g are 18, 1, 0.5, 4 and p respectively, then find the value of x and p.

  • A
    5 and ±2
  • B
    4 and ±3
  • Correct answer
    C
    163 and ±32
  • D
    8 and ±2

Solution

Δyy=2Δmm+4Δrr+xΔgg+32Δll

18=2(1)+4(0.5)+xp+32(4)

8=xp

By checking from options.

x=163, p=±32

Hence, the correct answer is option: 'C'.

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