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A piston cylinder device initially conta...

A piston cylinder device initially contains `0.2m^(3)` neon (assume ideal ) at 200kPa inside at `T_(1) ""^(@)C`. A valve is now opened and neon is allowed to escape until the volume reduces to half the initial volume. At the same time heat transfer with outside at `T_(2) ""^(@)C` ensures a constant temperature inside. Select correct statement(s) for given process

A

`Delta U` must be zero

B

`Delta U` can not be zero

C

q may be +ve

D

q may be -ve

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