Assertion : When a gas is allowed to expand, work done by gas is positive.
Reason : Force due to gaseous pressure and displacement (of position) on in the same direction.
(1) If both assertion and reason and the reason is the correct explanation of the Assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(3) If the assertion is true but reason is false.
(4) If the assertion and reason both are false.
