Qn : https://www.dropbox.com/s/dpcws9q4bjpzvtp/20151123_112037.jpg?dl=0 Why is option A and C wrong or correct? My attempted answer : A :A is plausible as if the piston is suddenly moved inwards, the gas molecules bounce off the piston at higher speeds Since Temp proportional to rms speed, temp increases Or based on 1st law of thermodynamics The piston suddenly moved in.... So means Q=0 cos no time for heat transfer. Since compression, W is +ve so U is +ve. That implies T increases. C : as P increases, V decreases Please help to correct my understanding! ! Thanks a million! !!