what are the aspect ratios of national flags of respective countries (ex:India=1:1.414) of the world?

Answer 1

Interesting question, never realised there was much to this.

This is hard to find, but it's given at http://www.flags.net/
"Aspect ratio" of a flag is also known as "proportions" or "flag ratio". Seems these are not always observed, e.g. for the American Stars and Stripes http://en.wikipedia.org/wiki/Stars_and_Stripes_flag#Flag_ratios

Also, when you say "national flag", it turns out there are civil flags (generally used by civilians), state flags (flown on state buildings and embassies) and military flags; each may have a different aspect ratio (e.g. Iceland).

Here are some common ones, taken from www.flags.net:
USA 10:19 (!)
UK 1:2
India 2:3 (not sure where you got 1.14 from, is that 7:8?)
China 2:3
EU 2:3
Japan 2:3 (supersedes the old 7:10, given by flags.net)
Brazil 7:10
Switzerland and Vatican City are the only national flags which are exact squares (1:1).

I was expecting it would be 1:2, 2:3, 3:4, 3:5 as those dimensions will fold nicely, but no!
Also the Olympics must have it wrong making them all the same proportions...

Answer 2

American Flag Aspect Ratio

Answer 3

Here is something interesting from the United Nations, you may click the link below to enter:

According to http://www.un.org/Overview/Tours/UNHQ/, "Along First Avenue one can see the colourful display of flags of the Member States. Placed in English alphabetical order, the first flag at the level of 48th Street is Afghanistan, and the last one, by 42nd Street, is Zimbabwe."