# 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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The molar specific heats of an ideal gas at constant pressure and volume are denoted by $$C_P$$ and $$C_V,$$ respectively. If $$\gamma =\frac{C_P}{C_V}$$ and $$R$$ is the universal gas constant, then $$C_V$$ is equal to:
 1 $$\frac{R}{\gamma -1}$$ 2 $$\frac{\gamma -1}{R}$$ 3 $$\gamma R$$ 4 $$\frac{\left ( \gamma -1 \right )R}{\left ( \gamma +1 \right )}$$
Subtopic:  Molar Specific Heat |
88%
From NCERT
AIPMT - 2013
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During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $$\frac{C_P}{C_V}$$ for the gas is:
1. $$2$$
2. $$5/3$$
3. $$3/2$$
4. $$4/3$$
Subtopic:  Types of Processes |
71%
From NCERT
AIPMT - 2013
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A thermodynamic system is taken through the cycle $$\mathrm{ABCD}$$ as shown in the figure. Heat rejected by the gas during the cycle is:

1. $$2 {PV}$$
2. $$4{PV}$$
3. $$\frac{1}{2}{PV}$$
4. $$PV$$

Subtopic:  Cyclic Process |
74%
From NCERT
AIPMT - 2012
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One mole of an ideal gas goes from an initial state $$A$$ to the final state $$B$$ with two processes. It first undergoes isothermal expansion from volume $$V$$ to $$3V$$ and then its volume is reduced from $$3V$$ to $$V$$ at constant pressure. The correct $$(P-V)$$ diagram representing the two processes is:

 1 2 3 4

Subtopic:  Types of Processes |
81%
From NCERT
AIPMT - 2012
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When $$1$$ kg of ice at $$0^{\circ}$$ C melts into the water at $$0^{\circ}$$ C, the resulting change in its entropy, taking the latent heat of ice to be $$80$$ cal/gm, is:
1. $$8\times 10^4$$ cal/K
2. $$80$$ cal/K
3. $$293$$ cal/K
4. $$273$$ cal/K

Subtopic:  Second Law of Thermodynamics |
57%
From NCERT
AIPMT - 2011
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During an isothermal expansion, a confined ideal gas does -150 J of work against its surrounding. This implies that:

 1 300 J of heat has been added to the gas. 2 no heat is transferred because the process is isothermal. 3 150 J of heat has been added to the gas. 4 150 J of heat has been removed from the gas.

Subtopic:  First Law of Thermodynamics |
66%
From NCERT
AIPMT - 2011
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