Q12. (a) Unit of uniform speed
(b) Two different dyes can be separated by which method?
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Explanation:
a:Speed is a measure of how fast an object is moving at a given instant of time. It is a scalar quantity. Its unit is m/s.
b:Scientists use a process called chromatography (kroh-muh-tog-ruh-fee) to separate different parts of a mixture. Dots of the mixtures—different colors of washable markers—are placed on a piece of coffee filter paper. ... Different dyes move up the paper at different rates and become separated.
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(a) metre per second
(b) chromatography
Explanation:
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