When heat energy of 1500 Joules, is supplied to a gas at constant pressure \[2.1\times {{10}^{5}}N/{{m}^{2}}\], there was an increase in its volume equal to \[2.5\times {{10}^{-3}}{{m}^{3}}\]. The increase in internal energy of the gas in Joules is [EAMCET (Engg.) 1999]

• A.            450                                           
• B.            525
• C.            975
• D.            2025