Question

1. For a given temperature and pressure, equal volumes of different gases have the same
A. Number of molecules
B. Molecular weight
C. Density
D. Total mass
E. None of the above.

2. During the adiabatic process, the change in the temperature of the system is
A. Greater than zero.
B. Less than zero.
C. Equal to zero.
D. Any of the above.
E. It depends on the initial temperature.

Answer 1

Question 1:

Answer: A

"For a given temperature and pressure, equal volumes of different gases, have the same number of molecules."

This is Avogadro's Law.

Molecular weights are different for different gases irrespective of thier pressure, temperature, and volume.

At constat temperature, pressure, and same volumes, total mass of gas depends on its molecular weight. The greater molecular weight, the more the total mass of gas.

Density is the amount of mass contained in a given volume. So, at constant pressure, temperature, and same volumes, the gas with more total mass will have more density than the other.

Question 2:

Answer: A and B

An adiabatic process is a process in which there is no exchange of heat between the sysystem and the surroundings. So, there will be a change in temperature of the system.

In an adiabatic expansion, the temperature of the system falls. So, We can think of it as negative change of tempeture(less than zero).

In an adiabatic compression, the temperature of the system rises. We can think of it as positive change of temperature(greater than zero).

So, in an adiabatic process, the temperature change can be less than zero or greater than zero, but it cannot be zero, becuase there will definitely be a change in temperature.

Also, the temperature change will not depend on initial temperature of the system. It only depends on the type of adiabatic process.

So, C, D, and E options are wrong.