Two cylinders, \(A\) and \(B\), of equal capacity are connected to each other via a stopcock. \(A\) contains gas at a standard temperature and pressure. \(B\) is completely evacuated. The entire system is thermally insulated. If the stopcock is suddenly opened, then the change in internal energy of the gas is:
1. \(0\)
2. \(5~\text{J}\)
3. \(1~\text{J}\)
4. \(3~\text{J}\)

Subtopic:  First Law of Thermodynamics |
 88%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The incorrect relation is:
(where symbols have their usual meanings)

1. CP=γRγ-1

2. CP-CV=R

3. U=PfVf-PiVi1-γ

4. CV=Rγ-1

Subtopic:  Molar Specific Heat |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Two cylinders contain the same amount of an ideal monoatomic gas. The same amount of heat is given to two cylinders. If the temperature rise in cylinder A is T0, then the temperature rise in cylinder B will be:

1. 43T0

2. 2T0

3. T02

4. 53T0

Subtopic:  Molar Specific Heat |
 58%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The pressure and volume of a gas are changed as shown in the P-V diagram. The temperature of the gas will:

    

1.  increase as it goes from A to B.
2. increase as it goes from B to C.
3. remain constant during these changes.
4. decrease as it goes from D to A.

Subtopic:  Types of Processes |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Find out the total heat given to diatomic gas in the process ABC : (BC is isothermal)
                 

1. P0V0+2P0V0 ln2

2. 12P0V0+2P0V0ln2

3. 52P0V0+2P0V0 ln2

4. 3P0V0+2P0V0 ln2

Subtopic:  First Law of Thermodynamics |
 61%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The figure shows the \((P\text-V)\) diagram of an ideal gas undergoing a change of state from \(A\) to \(B\). Four different paths \(\mathrm{I, II, III}\) and \(\mathrm{IV}\), as shown in the figure, may lead to the same change of state.
               

(a) The change in internal energy is the same in cases \(\mathrm{IV}\) and \(\mathrm{III}\) but not in cases \(\mathrm{I}\) and \(\mathrm{II}\).
(b) The change in internal energy is the same in all four cases.
(c) Work done is maximum in case \(\mathrm{I}\).
(d) Work done is minimum in case \(\mathrm{II}\).

Which of the following options contains only correct statements?

1. (b), (c), (d) 2. (a), (d)
3. (b), (c) 4. (a), (c), (d)
Subtopic:  Work Done by a Gas |
 78%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Consider a cycle followed by an engine (figure). 

            
1 to 2 is isothermal,
2 to 3 is adiabatic,
3 to 1 is adiabatic.
Such a process does not exist, because:

(a) heat is completely converted to mechanical energy in such a process, which is not possible.
(b) In this process, mechanical energy is completely converted to heat, which is not possible.
(c) curves representing two adiabatic processes don’t intersect.
(d) curves representing an adiabatic process and an isothermal process don't intersect.

Choose the correct alternatives:
1. (a), (b)
2. (a), (c)
3. (b), (c)
4. (c), (d)

Subtopic:  First Law of Thermodynamics | Second Law of Thermodynamics |
 55%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

0.04 mole of an ideal monatomic gas is allowed to expand adiabatically so that its temperature changes from 800 K to 500 K. The work done during expansion is nearly equal to:

 

1. \(129.6\) J 2. \(-129.6\) J
3. \(149.6\) J 4. \(-149.6\) J
Subtopic:  Work Done by a Gas |
 57%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If an ideal gas undergoes two processes at constant volumes V1 and V2 as shown in the pressure-temperature (P-T) diagram, then:

   

1. V1 = V2

2. V1 > V2

3. V1 < V2

4. V1V2

Subtopic:  Types of Processes |
 80%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In the cyclic process shown in the pressure-volume \((P-V)\) diagram, the change in internal energy is equal to:

     

1. πP2-P122

2. πV2-V122

3. π4(P2-P1)(V2-V1)

4. zero

Subtopic:  Cyclic Process |
 73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch