A cup of water at 5°C (system) is placed in a microwave oven and the oven is turned on for one minute during which, the water begins to boil. Which of the following option is true ? (A) q = +ve, w = 0

Question

A cup of water at 5°C (system) is placed in a microwave oven and the oven is turned on for one minute during which, the water begins to boil. Which of the following option is true ?

(A) q = +ve, w = 0, U = –ve
(B) q = +ve, w = –ve, U = +ve
(C) q = –ve, w = –ve, U = –ve
(D) q = +ve, w = –ve, U = –ve

Prashant Kotian · Accepted Answer

Correct answer: B. 2 5 C 100 C 100 C H O( ) H O( ) H O(g)       due to expansion w = -ve as heat is given to system so q = +ve and internal energy of gas will be more than internal energy of liquid soU = +ve

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