Question

One micron is equal to-
1. 10^-6 mm
2. 10^-8 mm
3. 10^-3 mm
4. 10^-10 mm

Answer 1

Correct Answer - Option 3 : 10^-3 mm

CONCEPT:

• Metric prefix: A metric prefix is a unit prefix placed before a basic unit of measurement. It represents the multiple of the unit in a convenient way. 

​A few common metric prefixes used are as below:

Metric Prefix	Symbol	Value
peta	P	1015
tera	T	1012
giga	G	109
mega	M	106
kilo	k	103
hecto	h	102
deka	da	101
deci	d	10-1
centi	c	10-2
milli	m	10-3
micro	μ	10-6
nano	n	10-9
Angstrom	Å	10-10
pico	p	10-12

One micron length = 1 micrometre = 1 μm = 1 × 10-6 m

We know,

1 m →  1000 mm

∴ 1 × 10-6 m → \(\frac{1000\: mm}{1\:m}\) × 10-6 m = 10-3 mm