Pressure-volume relation: jar A has ; jar B has . Find ratio of number of molecules.
1
2
3
4
Official Solution
Correct Option: (4)
Concept: Step 1: Jar A
Step 2: Jar B
Step 3: Ratio Conclusion:
02
PYQ 2014
medium
physicsID: met-2014
Two identical vessels contain gases at . One heated to . Find pressure and number of moles .
1
2
3
4
Official Solution
Correct Option: (2)
Step 1: Initial moles in each vessel
Step 2: After heating one vessel
Step 3: Total moles conserved
Step 4: Moles in heated vessel Conclusion:
03
PYQ 2014
medium
physicsID: met-2014
For a real gas, variation of with pressure is shown. Identify correct curve.
1
Curve A
2
Curve B
3
Curve C
4
Curve D
Official Solution
Correct Option: (2)
Concept:
is called compressibility factor. Step 1: Ideal gas
Step 2: Real gas behavior
• At low pressure: intermolecular attraction dominates
• At high pressure: repulsion dominates Step 3: Graph nature
Curve dips below 1 and then rises above 1. Conclusion:
04
PYQ 2020
medium
physicsID: met-2020
Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and volume . The masses are and . On isothermal expansion to , pressure changes are and respectively. The relation between masses is:
1
2
3
4
Official Solution
Correct Option: (3)
Concept:
For isothermal process:
Step 1: Pressure change relation.
Thus:
Step 2: Use given data.
For A:
For B:
05
PYQ 2020
medium
physicsID: met-2020
During an experiment, an ideal gas is found to obey an additional law . The gas is initially at temperature and volume . The temperature of the gas when it expands to a volume is:
Two identical cylinders contain helium at 2.5 atm and argon at 1 atm respectively. If both the gases are filled in one of the cylinders, the pressure would be:
1
3.5 atm
2
1.50 atm
3
1.75 atm
4
1 atm
Official Solution
Correct Option: (1)
Concept:
Using ideal gas law:
Step 1: Initial moles.
For identical cylinders (same ):
Step 2: Total moles.
Step 3: Final pressure.
Now gases are in one cylinder (volume ):
