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Q. No.An electric heater supplies heat to a system at a rate of \(100\) W. If the system performs work at a rate of \(75\) J/s, then the rate at which internal energy increases will be:
1. \(125~\text{W}\)
2. \(100~\text{W}\)
3. \(25~\text{W}\)
4. \(75~\text{W}\)
1. \(125~\text{W}\)
2. \(100~\text{W}\)
3. \(25~\text{W}\)
4. \(75~\text{W}\)
Subtopic: First Law of Thermodynamics |
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Level 2: 60%+
NEET - 2026
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In an adiabatic expansion, the temperature of one mole of an ideal monatomic gas \(\left ( \gamma =5/3 \right )\) decreases from \(60~\text{K}\) to \(50~\text{K}.\) The work done by the gas in the process is:
(take the universal gas constant as \(R=8.31\) mol-1 K-1)
1. \(166\) J
2. \(41.5\) J
3. \(83.1\) J
4. \(124.5\) J
(take the universal gas constant as \(R=8.31\) mol-1 K-1)
1. \(166\) J
2. \(41.5\) J
3. \(83.1\) J
4. \(124.5\) J
Subtopic: Work Done by a Gas |
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One mole of an ideal monatomic gas undergoes a cyclic process as shown in the figure. The total heat supplied to the gas is:
1. \(800\) J
2. \(400\) J
3. \(500\) J
4. \(600\) J
1. \(800\) J
2. \(400\) J
3. \(500\) J
4. \(600\) J
Subtopic: Cyclic Process |
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Two gases \(A\) and \(B\) are filled at the same pressure in separate cylinders with movable pistons of radius \(r_A\) and \(r_B,\) respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pistons of gas \(A\) and \(B\) are displaced by \(16~ \text{cm}\) and \(9~ \text{cm},\) respectively. If the change in their internal energy is the same, then the ratio \(r_A / r_B\) is equal to:
| 1. | \(\dfrac{2}{\sqrt{3}}\) | 2. | \(\dfrac{\sqrt{3}}{2}\) |
| 3. | \(\dfrac{4}{3}\) | 4. | \(\dfrac{3}{4}\) |
Subtopic: Work Done by a Gas |
Level 3: 35%-60%
NEET - 2025
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A thermodynamic system is taken through the cycle \(abcda.\) The work done by the gas along the path \(bc\) is:
| 1. | \(30~\text J\) | 2. | \(-90~\text J\) |
| 3. | \(-60~\text J\) | 4. | zero |
Subtopic: Work Done by a Gas |
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NEET - 2024
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For an adiabatic process, the factor which remains constant is: (all the notations have their usual meaning)
1. \(P^{\gamma-1} {~T}^\gamma \)
2. \(T V^{1-\gamma} \)
3. \(V^{\gamma-1} {~T}^ \gamma \)
4. \(P^{1-\gamma} ~{T}^\gamma\)
1. \(P^{\gamma-1} {~T}^\gamma \)
2. \(T V^{1-\gamma} \)
3. \(V^{\gamma-1} {~T}^ \gamma \)
4. \(P^{1-\gamma} ~{T}^\gamma\)
Subtopic: Types of Processes |
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The equilibrium state of a thermodynamic system is described by:
Choose the most appropriate answer from the options given below:
| A. | Pressure | B. | Total heat |
| C. | Temperature | D. | Volume |
| E. | Work done | ||
| 1. | A, B and E only | 2. | B, C and D only |
| 3. | A, B and C only | 4. | A, C and D only |
Subtopic: Basic Terms |
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For the given cycle, the work done during the isobaric process is:
| 1. | \(200\) J | 2. | zero |
| 3. | \(400\) J | 4. | \(600\) J |
Subtopic: Work Done by a Gas |
58%
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NEET - 2023
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An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric, and isochoric. The curve which represents the adiabatic process among \(1,\) \(2,\) \(3\) and \(4\) is:
| 1. | \(4\) | 2. | \(1\) |
| 3. | \(2\) | 4. | \(3\) |
Subtopic: Types of Processes |
77%
Level 2: 60%+
NEET - 2022
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A gas undergoes an isothermal process. The specific heat capacity of the gas in the process is:
| 1. | infinity | 2. | \(0.5\) |
| 3. | zero | 4. | \(1\) |
Subtopic: Molar Specific Heat |
72%
Level 2: 60%+
NEET - 2022
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