Class 11th Physics Units and Measurement

Which of the following is a CORRECT statement?

Option 1 - <p>2.3056 + 10.138 – 7.4671 = 4.9765</p>

Option 2 - <p>2.38 × 1.0 = 2.38</p>

Option 3 - <p><span class="mathml" contenteditable="false"> <math> <mrow> <mfrac> <mrow> <mn>8</mn> <mo>.</mo> <mn>0</mn> <mn>5</mn> </mrow> <mrow> <mn>3</mn> <mo>.</mo> <mn>1</mn> </mrow> </mfrac> <mo>=</mo> <mn>2</mn> <mo>.</mo> <mn>5</mn> <mn>9</mn> <mo>≈</mo> <mn>2</mn> <mo>.</mo> <mn>6</mn> </mrow> </math> </span></p>

Option 4 - <p>(1.11 – 0.1) × 9.0 = 9.0</p>

37 Views|Posted a year ago

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Answered by

Vishal Baghel | Contributor-Level 10

a year ago

Correct Option - 3

Detailed Solution:

(1) 2.3056 -> 4 decimals

10.138 -> 3 decimals

-7.4671 -> 4 decimals

_________________

4.9765

Answer should have 3 decimals.

(2) 2.38 * 1.0 = 2.38 -> answer should have 2 significant digits

(3) $\frac{8.05}{3.1} = 2.59 \approx 2.6$ answer should have 2SD

(4) 1.11 - 0.1 = 1.01 $\approx$ 1.0 but is an intermediate step so we keep 1 dig

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