KBC 2021: VIBGYOR is a popular mnemonic device to memorize what?

a) Days in a week

b) Ancient Wonders of the World

c) Snow White's seven dwarfs

d) Seven colours of a rainbow

Answer: (d) Seven colours of a rainbow 

The mnemonic form of a spectrum/succession rainbow's colours is VIBGYOR. The first letters of the rainbow's colours are placed in a certain order to make it easier to remember all of the colours.

ROYGBIV is another name for it. ROYGBIV is the mnemonic of choice in the United States and the United Kingdom. It is VIBGYOR in reverse since the Brits and Americans both tend to prefer starting with red.

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