Question

In the operation, 5.001 x 9.10, the number of significant figures and the result of the operation respectively are,
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Answer 1

Explanation:

Zeroes before a digit is not counted as a significant figure. In first number all digits are significant. In number second only 3 is significant all other zeroes are before digit therefore, not counted as a significant figure and numbers in powers are also not counted as a significant number, hence there are only 2 significant digits in the last number. Therefore, option (A)

Answer 2

The operation are respectively in $45.5$.

Explanation:

$5.001*9.10=45.50$

• The rule says: Answer to a multiplication or division should be rounded off to a same number of significant figures as possessed by the least precise term in the calculation.

• Since 5.001 has least numbers of significant i.e. two, thus, the result should have 2 significant.