# A sample of $$0.1$$ g of water at $$100^{\circ}\mathrm{C}$$ and normal pressure ($$1.013 \times10^5$$ N m–2) requires $$54$$ cal of heat energy to convert it into steam at $$100^{\circ}\mathrm{C}$$. If the volume of the steam produced is $$167.1$$ cc, <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> then the change in internal energy of the sample will be: 1. $$104.3$$ J 2. $$208.7$$ J 3. $$42.2$$ J 4. $$84.5$$ J

Subtopic:  First Law of Thermodynamics |
69%
From NCERT
NEET - 2018
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One mole of an ideal monatomic gas undergoes a process described by the equation $$PV^3=\mathrm{constant}.$$ The heat capacity of the gas during this process is:
1. $$\frac{3}{2}R$$
2. $$\frac{5}{2}R$$
3. $$2R$$
4. $$R$$

Subtopic:  Molar Specific Heat |
From NCERT
NEET - 2016
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The volume ($$V$$) of a monatomic gas varies with its temperature ($$T$$), as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state $$\mathrm{A}$$ to state $$\mathrm{B}$$ will be:

 1 $$2 \over 5$$ 2 $$2 \over 3$$ 3 $$1 \over 3$$ 4 $$2 \over 7$$
Subtopic:  Molar Specific Heat |
65%
From NCERT
NEET - 2018
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The efficiency of an ideal heat engine (Carnot heat engine) working between the freezing point and boiling point of water is:
1. $$26.8\%$$
2. $$20\%$$
3. $$6.25\%$$
4. $$12.5\%$$

Subtopic:  Carnot Engine |
77%
From NCERT
NEET - 2018
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A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then,

 1 compressing the gas through an adiabatic process will require more work to be done. 2 compressing the gas isothermally or adiabatically will require the same amount of work. 3 which of the case (whether compression through isothermal or through the adiabatic process) requires more work will depend upon the atomicity of the gas. 4 compressing the gas isothermally will require more work to be done.

Subtopic:  Types of Processes |
71%
From NCERT
NEET - 2016
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An ideal gas is compressed to half its initial volume using several processes. Which of the processes results in the maximum work done on the gas?
2. isobaric
3. isochoric
4. isothermal

Subtopic:  Work Done by a Gas |
70%
From NCERT
NEET - 2015
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The figure below shows two paths that may be taken by gas to go from state $$A$$ to state $$C$$

In process $$AB$$, $$400~\text{J}$$ of heat is added to the system, and in process $$BC$$, $$100~\text{J}$$ of heat is added to the system. The heat absorbed by the system in the process $$AC$$ will be:
1. $$380~\text{J}$$
2. $$500~\text{J}$$
3. $$460~\text{J}$$
4. $$300~\text{J}$$

Subtopic:  First Law of Thermodynamics |
58%
From NCERT
NEET - 2015
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A monoatomic gas at a pressure $$P$$, having a volume $$V$$, expands isothermally to a volume $$2V$$ and then adiabatically to a volume $$16V$$. The final pressure of the gas is: $$\left(\text{Take:}~ \gamma = \frac{5}{3} \right)$$

1. $$64 ~P$$
2. $$32~P$$
3. $$\frac{P}{64}$$
4. $$16~P$$
Subtopic:  Types of Processes |
74%
From NCERT
AIPMT - 2014
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A thermodynamic system undergoes a cyclic process $$ABCDA$$ as shown in Fig. The work done by the system in the cycle is:

1. $$P_0 V_0$$
2. $$2 P_0 V_0$$
3. $$\frac{P_0 V_0}{2}$$
4. zero

Subtopic:  Cyclic Process |
81%
From NCERT
AIPMT - 2014
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A gas is taken through the cycle $$A\rightarrow B\rightarrow C\rightarrow A$$, as shown. What is the total amount of work done by the gas?

 1 $$1000~\text{J}$$ 2 zero 3 $$-2000~\text{J}$$ 4 $$2000~\text{J}$$
Subtopic:  Work Done by a Gas |
74%
From NCERT
AIPMT - 2013
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