# A given mass of gas expands from state A to state B by <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> three paths, 1, 2 and 3, as shown in the figure. If ${\mathrm{W}}_{1},$ ${\mathrm{W}}_{2}$ $\mathrm{and}$ ${\mathrm{W}}_{3}$ respectively be the work done by the gas along the three paths, then: 1. W1 > W2 > W3 2. W1 < W2 < W3 3. W1 = W2 = W3 4. W1 < W2 = W3

Subtopic:  Work Done by a Gas |
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For the indicator diagram given below, which of the following is not correct?

 1 Cycle - II is a heat engine cycle. 2 Net work is done on the gas in cycle I. 3 Work done is positive for cycle I. 4 Work done is positive for cycle II.

Subtopic:  Cyclic Process |
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Thermodynamic processes are indicated in the following diagram.

Match the following:

 Column I Column II P. Process-I a. Adiabatic Q. Process-II b. Isobaric R. Process-III c. Isochoric S. Process-IV d. Isothermal

 1 $$P \rightarrow \mathrm{a}, Q \rightarrow \mathrm{c}, R \rightarrow \mathrm{d}, S \rightarrow \mathrm{b}$$ 2 $$P \rightarrow \mathrm{c}, Q \rightarrow \mathrm{a}, R \rightarrow \mathrm{d}, S \rightarrow b$$ 3 $$P \rightarrow \mathrm{c}, Q \rightarrow \mathrm{d}, R \rightarrow \mathrm{b}, S \rightarrow a$$ 4 $$P \rightarrow \mathrm{c}, Q \rightarrow \mathrm{d}, R \rightarrow \mathrm{b}, S \rightarrow a$$
Subtopic:  Types of Processes |
87%
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NEET - 2017
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An ideal gas goes from state A to state B via three different processes, as indicated in the P-V diagram. If ${\mathrm{Q}}_{1},$ ${\mathrm{Q}}_{2},$ ${\mathrm{Q}}_{3}$ indicates the heat absorbed by the gas along the three processes and $∆{\mathrm{U}}_{1},$ $∆{\mathrm{U}}_{2},$ $∆{\mathrm{U}}_{3}$ indicates the change in internal energy along the three processes respectively, then:

 1 $$\mathrm{Q}_1>\mathrm{Q}_2>\mathrm{Q}_3$$ and $$\Delta \mathrm{U}_1=\Delta \mathrm{U}_2=\Delta \mathrm{U}_3$$ 2 $$\mathrm{Q}_3>\mathrm{Q}_2>\mathrm{Q}_1$$ and $$\Delta \mathrm{U}_1=\Delta \mathrm{U}_2=\Delta \mathrm{U}_3$$ 3 $$\mathrm{Q}_1=\mathrm{Q}_2=\mathrm{Q}_3$$ and $$\Delta \mathrm{U}_1>\Delta \mathrm{U}_2>\Delta \mathrm{U}_3$$ 4 $$\mathrm{Q}_3>\mathrm{Q}_2>\mathrm{Q}_1$$ and $$\Delta \mathrm{U}_1>\Delta \mathrm{U}_2>\Delta \mathrm{U}_3$$

Subtopic:  First Law of Thermodynamics |
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NEET - 2012
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In thermodynamic processes, which of the following statements is not true?

 1 In an adiabatic process, the system is insulated from the surroundings. 2 In an isochoric process, the pressure remains constant. 3 In an isothermal process, the temperature remains constant. 4 In an adiabatic process, $$P V^\gamma$$ = constant.

Subtopic:  Types of Processes |
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NEET - 2009
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The specific heat of a gas in an isothermal process is:
1. Infinite
2. Zero
3. Negative
4. Remains constant

Subtopic:  Molar Specific Heat |
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Two identical samples of a gas are allowed to expand, (i) isothermally and (ii) adiabatically. Work done will be:

 1 more in the isothermal process. 2 more in the adiabatic process. 3 equal in both processes. 4 none of the above.

Subtopic:  Work Done by a Gas |
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In an adiabatic expansion of a gas, if the initial and final temperatures are $$T_1$$ and $$T_2$$, respectively, then the change in internal energy of the gas is:
1. $$\frac{nR}{\gamma-1}(T_2-T_1)$$
2. $$\frac{nR}{\gamma-1}(T_1-T_2)$$
3. $$nR ~(T_1-T_2)$$
4. Zero

Subtopic:  First Law of Thermodynamics |
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In a cyclic process, the internal energy of the gas:

 1 Increases 2 Decreases 3 Remains constant 4 Becomes zero
Subtopic:  Cyclic Process |
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When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is?

 1 $$2 \over 5$$ 2 $$3 \over 5$$ 3 $$3 \over 7$$ 4 $$5 \over 7$$
Subtopic:  Molar Specific Heat |
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