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Q.

A mixer jar becomes hot when it is run for a few minutes. This is mainly due to __________.

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a

external heat applied on it

b

electric current flowing across it. 

c

friction

d

mixer is a heat exchanger.

answer is C.

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Detailed Solution

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A jar of the mixie becomes hot when it is run for a few minutes. This is due to friction. 
The mixer jar becomes hot when it runs for a few minutes due to the friction between the rotating blades and walls of the mixer grinder.

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