Basic General Knowledge
The five intertwined rings or circles on the Olympic Flag made of white silk are

from left to right yellow, red, green, black and blue respectively
from right to left blue, black, green, red and yellow respectively
from right to left blue, yellow, black, green and red respectively
from left to right blue, yellow, black, green and red respectively

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Basic General Knowledge
The exhaled air contains

carbon dioxide only
a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
a mixture of carbon dioxide and nitrogen
a mixture which has more carbon dioxide than oxygen

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