If $$\Delta Q$$ is the heat flowing out of a system, $$\Delta W$$ is the work done by the system on its surroundings, and $$\Delta U$$ is the decrease in internal energy of the system, then the first law of thermodynamics can be stated as:
 1 $$\Delta Q=\Delta U+\Delta W$$ 2 $$\Delta U=\Delta Q+\Delta W$$ 3 $$\Delta U=\Delta Q-\Delta W$$ 4 $$\Delta U+\Delta Q+\Delta W=0$$
Subtopic:  First Law of Thermodynamics |
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A thermodynamic process involving a system takes place with $$100$$ J of heat being rejected to the environment and an increase of $$20$$ J of internal energy. Then,

 1 work done by the system is $$120$$ J. 2 work done on the system is $$120$$ J. 3 work done by the system is $$80$$ J. 4 work done on the system is $$80$$ J.
Subtopic:  First Law of Thermodynamics |
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If an average person jogs, he produces $$14.5 \times10^3$$ cal/min. This is removed by the evaporation of sweat. The amount of sweat evaporated per minute (assuming $$1$$ kg requires $$580 \times10^3$$ cal for evaporation) is:
1. $$0.25$$ kg
2. $$0.50$$ kg
3. $$0.025$$ kg
4. $$0.20$$ kg

Subtopic:  First Law of Thermodynamics |
65%
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NEET 2023 - Target Batch - Aryan Raj Singh
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$$1$$ g of water of volume $$1$$ cm3 at $$100^\circ \text{C}$$ is converted into steam at the same temperature under normal atmospheric pressure $$\approx 1\times10^{5}$$ Pa. The volume of steam formed equals $$1671$$ cm3. If the specific latent heat of vaporization of water is $$2256$$ J/g, the change in internal energy is:
1. $$2423$$ J
2. $$2089$$ J
3. $$167$$ J
4. $$2256$$ J

Subtopic:  First Law of Thermodynamics |
66%
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NEET - 2019
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The internal energy of a gas is given by $$U=\frac32PV.$$ The gas expands in such a way that its internal energy (initially $$U_0$$) remains constant throughout the process, but its volume changes from $$V_0$$ to $$2V_0.$$ The heat supplied to the gas equals:
1. $$U_0\mathrm{ln}(2)$$
2. $$\frac12U_0~\mathrm{ln}(2)$$
3. $$\frac13U_0~\mathrm{ln}(2)$$
4. $$\frac23U_0~\mathrm{ln}(2)$$
Subtopic:  First Law of Thermodynamics |
66%
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The first law of thermodynamics is a statement of:

 1 conservation of heat 2 conservation of work 3 conservation of momentum 4 conservation of energy

Subtopic:  First Law of Thermodynamics |
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Consider the process on a system shown in the figure. During the process, the work done by the system:

 1 continuously increases 2 continuously decreases 3 first increases then decreases 4 first decreases then increases

Subtopic:  Work Done by a Gas |
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An ideal gas goes from the state $$i$$ to the state $$f$$ as shown in figure given below. The work done by the gas during the process,

 1 is positive 2 is negative 3 is zero 4 cannot be obtained from this information
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. $$600$$
Subtopic:  Work Done by a Gas |
51%
From NCERT
NEET - 2023
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The molar specific heat at a constant pressure of an ideal gas is $$\frac{7}{2}R.$$ The ratio of specific heat at constant pressure to that at constant volume is:
1. $$\frac{7}{5}$$
2. $$\frac{8}{7}$$
3. $$\frac{5}{7}$$
4. $$\frac{9}{7}$$

Subtopic:  Molar Specific Heat |
77%
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AIPMT - 2006
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