Test Index

Units and Measurements

Section: Physics

Question : 4 of 13

Marks: +1, -0

\;\frac{0.501}{0.05}(0.312-0.03)

Solution:

Significant digit in simplification of

\;\frac{0.501}{0.05}(0.312-0.03)

In the subtraction of

0.312-0.03

The number 0.03 has two digits after decimal.

So,

0.312-0.03=0.282

But only upto two decimal places it can be written as 0.28 .

Now,

\;\frac{0.501}{0.05}

the term 0.05 has two digits after decimal

\;\frac{0.501}{0.05}=10.02 \approx 10

Now,

10.02 \times 0.28=2.8056

But this number should be rounded of to 2.8 .

So, number of significant digit is 2 .

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