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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. \(75~\text{W}\)
Subtopic: First Law of Thermodynamics |
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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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NEET - 2026
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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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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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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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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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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 a thermodynamic process described by the equation:
\(PV^2=C,\)
where \(C\) is a constant. The gas transitions from an initial state \((P_1, V_1, T_1)\) to a final state \((P_2, V_2, T_2).\) Which of the following statements is correct?
| 1. | \(\text{If}~P_1>P_2,~\text{then}~T_1<T_2 \) |
| 2. | \(\text{If}~V_2>V_1,~\text{then}~T_2>T_1\) |
| 3. | \(\text{If}~V_2>V_1,~\text{then}~T_2<T_1\) |
| 4. | \(\text{If}~P_1>P_2,~\text{then}~V_1>V_2\) |
Subtopic: Types of Processes |
51%
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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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