Question

Which of the following measurements has exactly two significant figures?

Options

• 0.00680 km

• 6800 km

• 68.0 km

• 0.068 km

Answer 1

0.068 km

Reason:

The leading zeros (0.0) are simply placeholders and are not counted as significant figures, leaving 6 and 8 as the two significant figures (Rule 3).