One millimeter is …………… part of a metre:

1. One hundredth
2. One thousandth
3. One billionth
4. One millionth

One astronomical unit is equal to:

1. 1.496 x 10¹¹ metre
2. 1.596 x 10¹² metre
3. 1.498 x 10¹⁰ metre
4. 1.398 x 10¹¹ metre

1 Fermi is equal to:

1. 10^-14 m
2. 10^-10 m
3. 10¹⁵ m
4. 10^-15 m

The unit of time is:

1. light year
2. parsec
3. leap year
4. angstrom