Given below are two statements. Statement-I : Adiabatic work done is positive when work is done on the system and internal energy of the system increases. Statement - II : No work is done during free expansion of an ideal gas. In the light of the above statements, choose the correct answer from the options given below.

• A

  Both statements - I and Statement - II are false
• B

  Statement - I is true but statement - II is false
• C

  Statement - I is false but statement - II is true
• Correct answer
  D

  Both statements - I and Statement - II are true.

Hence, the correct answer is option: 'D'.