(solved)Question 2.10 of NCERT Class XI Physics Chapter 2

State the number of significant figures in the following : (a) 0.007 m2 (b) 2.64 × 1024 kg (c) 0.2370 g cm-3 (d) 6.320 J (e) 6.032 N m-2 (f) 0.0006032 m2
(Rev. 31-Oct-2024)

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Parveen,

Question 2.10
NCERT Class XI Physics

State the number of significant figures in the following : (a) 0.007 m2 (b) 2.64 × 1024 kg (c) 0.2370 g cm-3 (d) 6.320 J (e) 6.032 N m-2 (f) 0.0006032 m2

Solution

Remember: Starting zeroes are NEVER significant. Trailing zeroes are significant ONLY if the number is a decimal number.

(a) 0.007\displaystyle 0.007

Ans: there is 1 significant figure. Zeroes to the left are never significant.

(b) 2.64×1024 kg\displaystyle 2.64 × 10^{24} \text{ kg}

Ans: 3 because the value is in scientific notation.

(c) 0.2370g cm−3\displaystyle 0.2370 \text{g cm}^{-3}

Ans: 4 because the number is decimal number so trailing zeroes are significant.

(d) 6.320 J

Ans: 4 because the number is decimal number so trailing zeroes are significant.

(e) 6.032N m−2\displaystyle 6.032 \text{N m}^{-2}

Ans: 4 because the number in scientific notation is 6.032×100\displaystyle 6.032 \times 10^0.

(f) 0.0006032m2\displaystyle 0.0006032 \text{m}^2

Ans: 4 because zeroes to the left are never significant.

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