$1$ nano metre ($1$nm) is equal to.

If $E$ and $H$ represents the intensity of electric field and magnetizing field respectively, then the unit of $\frac{E}{H}$ will be:

Find out the length of the feather in the picture given below.

Fill in the blank spaces by choosing correct words from the list given below:

List: millimetre, kilometre, centimetre, metre.

The $1/10,000,000$ part of the distance from the equator to the north pole along the longitude passing through Paris is called a _____.

Number the things 1,2,3 from shortest to longest (or tallest).