18) Which of the following statement is not true about an ideal gas that undergo

Question

18) Which of the following statement is not true about an ideal gas that undergoes an isothermal expansion?        A) Its volume increases.
       B) Heat enters gas.
       C) It temperature decreases.
       D) The average kinetic energy of the air molecules is unchanged.
       E) The pressure of the gas decreases. 19) Which of the following statement is not true about an ideal gas that undergoes an adiabatic expansion?        A) Its volume increases.
       B) Heat enters gas.
       C) It temperature decreases.
       D) The average kinetic energy of the air molecules decreases.
       E) The pressure of the gas decreases. 18) Which of the following statement is not true about an ideal gas that undergoes an isothermal expansion?        A) Its volume increases.
       B) Heat enters gas.
       C) It temperature decreases.
       D) The average kinetic energy of the air molecules is unchanged.
       E) The pressure of the gas decreases.

Explanation / Answer

18 :

(C) is wrong ... because in isothermal process temprature remains constant

19 :

(b) is wrong ... because in adiabatic process no heat is exchanged with sorrounding.

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