# 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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Consider two processes on a system as shown in figure (26-Q4).The volumes in the initial states are the same in the two processes and the volumes in the final states are also the same. Let ΔW1 and ΔW2 be the work done by the system in the processes A and B respectively.

1.  ΔW1 > ΔW2

2.  ΔW1 = ΔW

3.  ΔW1 < ΔW2

4.  Nothing can be said about the relation between ΔW1 and ΔW

Subtopic:  Work Done by a Gas |
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A gas is contained in a metallic cylinder fitted with a piston. The piston is suddenly moved in to compress the gas and is maintained at this position. As time passes the pressure of the gas in the cylinder

1.  increases

2.  decreases

3.  remains constant

4.  increases or decreases depending on the nature of the gas

Subtopic:  Types of Processes |
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The pressure $$p$$ and volume $$V$$ of an ideal gas both increase in a process.

 a. such a process is not possible. b. the work done by the system is positive. c. the temperature of the system must increase. d. heat supplied to the gas is equal to the change in internal energy.

Choose the correct option:
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)

Subtopic:  Work Done by a Gas |
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In a process on a system, the initial pressure and volume are equal to the final pressure and volume.

(a) The initial temperature must be equal to the final temperature.

(b) The initial internal energy must be equal to the final internal energy.

(c) The net heat given to the system in the process must be zero.

(d) The net work done by the system in the process must be zero

Choose the correct option

1.  (a) , (b)

2. (b) , (c)

3. (c) , (d)

4. (a) , (d)

Subtopic:  Types of Processes |
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A system can be taken from the initial state p1, V1 to the final state p2 , V2 by two different methods. Let ΔQ and ΔW represent the heat given to the system and the work done by the system. Which of the following must be the same in both the methods ?

1.  ΔQ

2.  ΔW

3.  ΔQ + ΔW

4.  ΔQ – ΔW

Choose the correct option

1.  (a) , (b)

2. (b) , (c)

3.  (d) only

4. (a) , (d)

Subtopic:  First Law of Thermodynamics |
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Refer to figure given below. Let $$ΔU_1$$ and $$ΔU_2$$ be the change in internal energy in processes $$A$$ and $$B$$ respectively, $$ΔQ$$ be the net heat given to the system in process $$A + B$$ and $$ΔW$$ be the net work done by the system in the process $$A + B.$$

For the above figure:

 a. $$\Delta U_1+\Delta U_2=0$$ b. $$\Delta U_1-\Delta U_2=0$$ c. $$\Delta Q-\Delta W=0$$ d. $$\Delta Q+\Delta W=0$$

Choose the correct option:

 1 (a), (b) 2 (b), (c) 3 (c), (d) 4 (a), (c)

Subtopic:  Cyclic Process |
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The internal energy of an ideal gas decreases by the same amount as the work done by the system.

(a) The process must be adiabatic.

(b) The process must be isothermal.

(c) The process must be isobaric.

(d) The temperature must decrease

Choose the correct option

1.  (a) , (b)

2. (b) , (c)

3. (c) , (d)

4. (a) , (d)

Subtopic:  Types of Processes |
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Work done by a sample of an ideal gas in a process A is double the work done in another process B. The temperature rises through the same amount in the two processes. If CA and CB be the molar heat capacities for the two processes,

1.  CA = CB

2.  CA < C

3.  CA > CB

4.  CA and CB cannot be defined

Subtopic:  First Law of Thermodynamics |
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For a solid with a small expansion coefficient,

1.  Cp - CV = R

2.  Cp = CV

3.  Cp is slightly greater than CV

4.  Cp is slightly less than CV

Subtopic:  Molar Specific Heat |
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