123) When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process.

124) The efficiency of Ericsson cycle is __________ Carnot cycle.

125) One molecule of oxygen consists of __________ atoms of oxygen.

126) According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

127) The hard coke is obtained when carbonisation of coal is carried out at