Thermodynamics--a short test

At room temperature, the rms speed of the molecules of a certain diatomic gas is found to be 1930 m/s. The gas is
H2
F2
O2
CI2
A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
4 RT
15 RT
9 RT
11 RT
A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300 K. The ratio of the average rotational kinetic energy per O2 molecule to that per N2 molecule is-
1:1
1:2
2:1
Depends on the moments of inertia of the two molecules
The average transnational energy and the rms speed of molecules in a sample of oxygen gas at 300 k are 6.21x 10-21 J and 484 m/s respectively. The corresponding values at 600 k are nearly (assuming ideal gas behavior)
12.42x 10-21 J, 968 m/s
8.78x 10-21 J, 684 m/s
6.21x 10-21 J, 968 m/s
12.42x 10-21 J, 684 m/s
A vessel contains I mole of O2 gas (relative molar mass 32) at a temperature T. The pressure of the gas is P. An identical vessel containing one mole of He gas (relative molar mass 4) at temperature 2T has a pressure of
P/8
P
2P
11 RT
The average transnational kinetic energy of O2 (relative molar mass 32) molecules at a particular temperature is 0.048 eV. The transnational kinetic energy of N2 (relative molar mass 28) molecules in eV at the
0.0015
0.003
0.048
0.768
/
-5J
-10J
-15J
-20J
An ideal gas is initially at P1 V1 is expanded to P2 V2 and then compressed adiabatically to the same volume V1 and pressure P3. If W is the net work done by the gas in complete process which of the following is true
W>0: P3> P1
W<0: P3>P1
W>0: P3 W<0:P3 Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30 K. Then the rise in temperature of the gas in B is
30 K
18 K
50 K
42 K
An ideal gas is taken from the state A(pressure P volume V) to the state B (pressure P/2) along a straight line path in the P-V diagram. Select the correct statement (s) from the following:
The work done by the gas in the process A to B exceeds the work that would be done by it if the system were taken from A to B along the isotherm.
In the T-V diagram, the path AB becomes a part of a parabola
In the P-T diagram, the path AB becomes a part of a parabola
In going from A to B, the temperature T of the gas first increase to a maximum value and then decreases.
Description:

Questions are on P-V diagram, translational k.e, adiabatic compression etc

Discussion
Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE 87 Members Recommend
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