An insulator container contains 4 moles of an ideal diatomic gas at a temperature T. If heat Q is supplied to this gas, due to which 2 moles of the gas are dissociated into atoms, but the temperature of the gas remains constant, then: 1. Q = 2RT 2. Q = RT 3. Q = 3RT 4. Q = 4RT

Subtopic:  First Law of Thermodynamics |
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 volume of air (diatomic) increases by $$5\%$$ in its adiabatical expansion. The percentage decrease in its pressure will be:

 1 $$5\%$$ 2 $$6\%$$ 3 $$7\%$$ 4 $$8\%$$
Subtopic:  Types of Processes |
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 Carnot engines A and B are operated in succession. The first one, A receives heat from a source at $$T_1=800$$ K and rejects to sink at $$T_2$$ K. The second engine, B, receives heat rejected by the first engine and rejects to another sink at $$T_3=300$$ K. If the work outputs of the two engines are equal, then the value of $$T_2$$ will be:

 1 100 K 2 300 K 3 550 K 4 700 K
Subtopic:  Carnot Engine |
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

The initial pressure and volume of a gas are $$P$$ and $$V$$, respectively. First, it is expanded isothermally to volume $$4V$$ and then compressed adiabatically to volume $$V$$. The final pressure of the gas will be: [Given: $$\gamma = 1.5$$]

 1 $$P$$ 2 $$2P$$ 3 $$4P$$ 4 $$8P$$
Subtopic:  Types of Processes |
74%
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

A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by $$62^{\circ}\mathrm{C}$$, the efficiency of the engine is doubled. The temperatures of the source and sink are:
1. $$80^{\circ}\mathrm{C}, 37^{\circ}\mathrm{C}$$
2. $$95^{\circ}\mathrm{C}, 28^{\circ}\mathrm{C}$$
3. $$90^{\circ}\mathrm{C}, 37^{\circ}\mathrm{C}$$
4. $$99^{\circ}\mathrm{C}, 37^{\circ}\mathrm{C}$$

Subtopic:  Carnot Engine |
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

An ideal gas is taken from point A to point B, as shown in the P-V diagram. The work done in the process is:

1. $\left({P}_{A}-{P}_{B}\right)\left({V}_{B}-{V}_{A}\right)$
2. $\frac{1}{2}\left({P}_{B}-{P}_{A}\right)\left({V}_{B}+{V}_{A}\right)$
3. $\frac{1}{2}\left({P}_{B}-{P}_{A}\right)\left({V}_{B}-{V}_{A}\right)$
4. $\frac{1}{2}\left({P}_{B}+{P}_{A}\right)\left({V}_{B}-{V}_{A}\right)$

Subtopic:  Work Done by a Gas |
52%
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 the temperature of the source and the sink in the heat engine is at 1000 K & 500 K respectively, then the efficiency can be:
1. 20%
2. 30%
3. 50%
4. All of these

Subtopic:  Carnot Engine |
54%
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 an adiabatic process, the graph for work done versus change of temperature $$\Delta T$$ will be:
 1 2 3 4
Subtopic:  Work Done by a Gas |
63%
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 n moles of an ideal gas is heated at a constant pressure from 50°C to 100°C, the increase in the internal energy of the gas will be: $$\left(\frac{C_{p}}{C_{v}} = \gamma\ and\ R = gas\ constant\right)$$

 1 $$\frac{50 nR}{\gamma - 1}$$ 2 $$\frac{100 nR}{\gamma - 1}$$ 3 $$\frac{50 nγR}{\gamma - 1}$$ 4 $$\frac{25 nγR}{\gamma - 1}$$
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

In the $$P\text-V$$ graph shown for an ideal diatomic gas, the change in the internal energy is:

 1 $$\frac{3}{2}P(V_2-V_1)$$ 2 $$\frac{5}{2}P(V_2-V_1)$$ 3 $$\frac{3}{2}P(V_1-V_2)$$ 4 $$\frac{7}{2}P(V_1-V_2)$$
Subtopic:  Molar Specific Heat |
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