\(1\) 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%
From NCERT
NEET - 2019
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Which of the following thermodynamic quantities is an outcome of the second law of thermodynamics ?

1. Work

2. Enthalpy

3. Internal energy

4. Entropy

Subtopic:  Second Law of Thermodynamics |
 69%
From NCERT
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A cyclic process ABCD is shown in the P-V diagram. Which of the following curves represent the same process?

Subtopic:  Cyclic Process |
 73%
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An ideal gas undergoes a cyclic process ABCA as shown. The heat exchange between the system and the surrounding during the process will be:

                     

1. 10 J 2. 5 J
3. 15 J 4. 20 J
Subtopic:  Cyclic Process |
 81%
From NCERT
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The molar heat capacity for an ideal gas

1.  cannot be negative

2.  must be equal to either CV or CP

3.  must lie in the range CVCCP

4.  may have any value between - and +

Subtopic:  Molar Specific Heat |
 50%
From NCERT
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An ideal gas expands according to the law PV2 = const. The molar heat capacity C is : 

1. CV + R 

2. CV  R 

3. CV + 2R

4. CV  3R

Subtopic:  Molar Specific Heat |
 67%
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The molar heat capacity C for an ideal gas going through a given process is given by C = a/T , where 'a' is a constant. If  γ= CP/CV , the work done by one mole of gas during heating from T0 to η T0 through the given process will be:

1.  1a ln η

2.  a ln η- η-1γ-1 RT0

3.  a ln η-γ-A RT0

4.  none of these

Subtopic:  Molar Specific Heat |
 76%
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The pressure of a monoatomic gas increases linearly from 4×105 N/m2 to 8×105 N/m2 when its volume increases from 0.2 m3 to 0.5 m3. The molar heat capacity of the gas is:
[R = 8.31 J/mol k]  

1. 20.1 J/molK               

2. 17.14 J/molK

3. 18.14 J/molK                                   

4. 20.14 J/molK

Subtopic:  Molar Specific Heat |
 59%
From NCERT
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What is the nature of change in internal energy in the following three thermodynamic processes shown in figure?

(1) U is  positive in all the three cases

(2) U is negative in all the three cases

(3) U is positive for (i), negative for (ii), zero for (iii)

(4) U = 0, in all the cases

Subtopic:  Cyclic Process |
 84%
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