Question

Write no. of significant figures in following?
(a) 0.0230
(b) 5.012
(c) 1456
(d) 0.0012

Answer 1

$\red{\bigstar}\underline{\underline{\textsf{\textbf{ Rules for Significant Digits :- }}}}$

❒ All non zero digit are significant .

• For ex - The number 5756 has 4 significant figures .

❒ All the zeros between non zero digit are significant .

• For ex - The number 578007 has 6 significant figures .

❒ For numbers having without decimal points the trailing zeros are in significant .

• For ex - 12300 has 3 significant figures .

❒ When there is a decimal point the trailing zeros are significant .

• For ex - 123.00 has 5 significant figures .

❒When number is less than one and has been expressed in decimal then initial zeros before the decimal point and after the decimal are insignificant .

• For ex - The number 0.002400 has 2 significant figures .

$\rule{200}4$

$\red{\bigstar}\underline{\underline{\textsf{\textbf{ Solution:- }}}}$

➳ 0.0230

• According to fifth rule mentioned above , it has three significant figures .

➳ 5.012

• According to second rule mentioned above it has four significant figures .

➳ 1456

• According to first rule mentioned above it has four significant figures.

➳ 0.0012

• According to fifth rule mentioned above it has two significant figures .

$\rule{200}4$