question_answer

100 g of water is heated from \[{{30}^{o}}C\] to \[{{50}^{o}}C\]. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K) [AIEEE 2011]

A)  2.1 kJ

B)                   4.2 kJ

C)  8.4 kJ  

D)       84 kJ

Correct Answer: C

Solution :

[c]

As