Question

During expansion of a gas at a fixed temperature ?

• A. There occurs a decrease in pressure
• B. There is no change in K.E. of the molecules of gas
• C. There occurs a decrease in K.E. of the gaseous molecules
• D. There occurs an increase in number of gas molecules

Answer 1

Answer: (A), (B)

The correct options are
A There occurs a decrease in pressure
B There is no change in K.E. of the molecules of gas

Since temperature is kept constant so pressure decrease causes the volume to increase.
K.E. remains unchanged $(K.E.\propto T)$
Number of gas molecules remains constant during expansion.