Question

Number of significant figures in 42306, 0.0007 and \(6.5 \times 10^{-3}\) are respectively.

• A. 4, 4, 2
• B. 5, 5, 2
• C. 5, 1, 5
• D. 5, 1, 2

Hint:

All non-zero digits are always significant. Leading zeros are never significant, while trailing zeros in a number without a decimal point may or may not be significant.

Answer 1

The Correct Option is D

- In \(42306\), all non-zero digits are significant, so it has 5 significant figures.
- In \(0.
0007\), only the 7 is significant, so it has 1 significant figure.
- In \(6.
5 \times 10^{-3}\), both 6 and 5 are significant, so it has 2 significant figures.