1.

In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is true?

Answer»

`Delta E = W ne 0 , q = 0`
`Delta E = W = q ne 0`
`Delta E = 0 , W = q ne 0`
`W = 0 , Delta E = q ne 0`

Solution :The mathematical form of first law of THERMODYNAMICS `q = Delta E + W `
SINCE the SYSTEM is closed and insulated, q = 0
And as liquid is stirred with a paddle hence work is done on system ` THEREFORE W ne 0`.
Temperature and internal energy of the system increases.
` therefore Delta E ne0`


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