GK QUESTION#3098
A ____ is one billionth of a metre.
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Answer
D. nanometre
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Explanation
The SI prefix nano means 10⁻⁹. Thus one nanometre equals one billionth of a metre. A micrometre is 10⁻⁶m and an ångström is 10⁻¹⁰m; a parsec is an astronomical distance unit.