Question

Which of the following is the smallest unit ?

• A. millimetre
• B. angstrom
• C. fermi
• D. metre

Answer 1

Answer: (C)

$1mm=10^{-3}m$;
$1\mathring{A}=10^{-10}m$;
$1fm=10^{-15}m$
Among the given units fermi is the smallest unit.