Consider the following statements and select the correct option.
Statement (A): Heat is not a state function.
Statement (B): Heat supplied to a system is a path function.
 
1. Both statements (A) and (B) are true.
2. Both statements (A) and (B) are false.
3. Only statement (A) is true.
4. Only statement (B) is true.

Subtopic:  Basic Terms |
 68%
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Given below are two statements: 
Assertion (A): It is not possible for a system, unaided by an external agency to transfer heat from a body at a lower temperature to another at a higher temperature.
Reason (R): It is not possible to violate the second law of thermodynamics.
  
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Second Law of Thermodynamics |
 75%
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An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric, and isochoric. The curve which represents the adiabatic process among \(1,\) \(2,\) \(3\) and \(4\) is: 
          
1. \(4\) 2. \(1\)
3. \(2\) 4. \(3\)
Subtopic:  Types of Processes |
 75%
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Select the correct option based on statements below.
A Carnot engine works between two thermal reservoirs maintained at absolute temperatures \(T_{\text{high}}\) and \(T_{\text{low}}\).
Assertion (A): If the efficiency of the engine is \(\frac1n,\) then the coefficient of performance of the reversed cycle working as a refrigerator is \(n-1\).
Reason (R): The efficiency of Carnot's cycle is \(1-\frac{T_{\text{low}}}{T_{\text{high}}},\) while the coefficient of performance of the reversed cycle is \(\frac{T_{\text{low}}}{T_{\text{high}~-~T_{\text{low}}}}\).
 
1. (A) is true but (R) is false.
2. (A) is false but (R) is true.
3. Both (A) and (R) are true and (R) is the correct explanation of (A).
4. Both (A) and (R) are true but (R) is not the correct explanation of (A).
Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 60%
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One mole of an ideal gas is taken through a cyclic process as shown in the \((V\text-T)\) diagram. Which of the following statements is correct?
          
1. The magnitude of the work done by the gas is \(RT_{0}\ln 2\).
2. Work done by the gas is \(V_{0}T_{0}.\)
3. Net work done by the gas is zero.
4. Work done by the gas is \(2RT_{0}\ln2\).
Subtopic:  Cyclic Process |
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One mole of a diatomic ideal gas undergoes a cyclic process \(ABC\) as shown in the figure. The process \(BC\) is adiabatic. The temperatures at \(A,\) \(B,\) and \(C\) are \(400\) K, \(800\) K, and \(600\) K respectively. Choose the correct statement:
               
1. The change in internal energy in the process \(BC\) is \(-500R.\)
2. The change in internal energy in the whole cyclic process is \(250R.\)
3. The change in internal energy in the process \(CA\) is \(700R.\)
4. The change in internal energy in the process \(AB\) is \(-350R.\)
Subtopic:  Cyclic Process |
 72%
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For ideal diatomic gases at normal temperature,
 
Statement I: Molar heat capacity at constant pressure for all diatomic gases is the same.
Statement II: The specific heat capacity at constant pressure of all diatomic ideal gases is the same.

Choose the correct statement(s):
 
1. only (I) is correct
2. only (II) is correct
3. both (I) and (II) are correct
4. none of them are correct
Subtopic:  Molar Specific Heat |
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Figure shows P-T diagram for given mass of an ideal gas for the process A→B. During this process, density of the gas is
                           
1. Decreasing

2. Increasing

3. Constant

4. First decreasing then increasing

Subtopic:  Types of Processes |
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Consider the following two statements.

(A): If heat is added to a system, its temperature must increase.
(B): If positive work is done by a system in a thermodynamic process, its volume must increase.
  
1. Both A and B are correct.
2. A is correct but B is wrong.
3. B is correct but A is wrong.
4. Both A and B are wrong.
Subtopic:  Work Done by a Gas |
 54%
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Match the thermodynamic processes taking place in a system with the correct conditions. In the table, \(\Delta Q\) is the heat supplied, \(\Delta W\) is the work done and \(\Delta U\) is the change in internal energy of the system.

Process Condition
(I) Adiabatic (A) \(\Delta W=0\)
(II) Isothermal (B) \(\Delta Q=0\)
(III) Isochoric (C) \(\Delta U\neq0, \Delta W\neq0,\Delta Q\neq0\)
(IV) Isobaric (D) \(\Delta U=0\)
 
1. (I) – (B), (II) – (A), (III) – (D), (IV) – (C)
2. (I) – (A), (II) – (A), (III) – (B), (IV) – (C)
3. (I) – (A), (II) – (B), (III) – (D), (IV) – (D)
4. (I) – (B), (II) – (D), (III) – (A), (IV) – (C)
Subtopic:  Types of Processes |
 89%
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