In the usual notation, the isothermal work, $W =$
- A$P\left(V_f-V_i\right)$
- B$n R T\left(P_i / P_f\right)$
- ✓$n R T \ln \left(P_i / P_f\right)$
- D$n R T\left(P_f / P_i\right)$.
Answer: C.
View full solution →Question types
Thermodynamics question types
166 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
166
Questions
5
Question groups
5
Question types
01
M.C.Q (1 Marks)
42 Q→02Very Short Answer Type Question
5 Q→03Short Answer Type Question
37 Q→04Answer the following in Brief
54 Q→05Answer the following in Detail
28 Q→Sample Questions
Thermodynamics questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In an isobaric process, in the usual notation,
- A$W={ }_n C_V\left(T_f-T_i\right)$
- ✓$Q={ }_n C_p\left(T_f-T_i\right)$
- C$\Delta U=n R\left(T_f-T_i\right)$
- D$W =0$.
Answer: B.
View full solution →In an isothermal process, in the usual notation,
- A$W=P\left(V_f-V_i\right)$
- B$W=0$
- C$W=V\left(P_f-P_i\right)$
- ✓$W=n R T \ln \left(V_f / N_i\right)$.
Answer: D.
View full solution →In an adiabatic process, in the usual notation,
- A$\Delta P=0$
- B$\Delta V=0$
- ✓$Q=0$
- D$\Delta U=0$.
Answer: C.
View full solution →In an isobaric process, in the usual notation,
- ✓$W=P\left(V_f-V_i\right)$
- B$W=Q$
- C$W=-\Delta U$
- D$\Delta T=0$.
Answer: A.
View full solution →An engine works at $5000\ rpm$, and it performs $1000\ J$ of work in one cycle. If the engine runs for $10\ min$, how much total work is done by the engine ?
View full solution →How would you interpret Eq. 4.21 (Q = W) for a cyclic process ?
Can you explain the thermodynamics involved in cooking food using a pressure cooker ?
Why is it necessary to make a physical contact between a thermocouple and the object for measuring its temperature ?
Why is it that different objects kept on a table at room temperature do not exchange heat with the table ?
Find the internal energy of one mole of argon at $300 \mathrm{~K} .(R=8.314 \mathrm{~J} / \mathrm{mol} . \mathrm{K})$
View full solution →Refer above figure and answer the following questions.
(i) What is the work done in process AB?
(ii) What is the change in internal energy and heat released in process $B C$ ?
View full solution →(i) What is the work done in process AB?
(ii) What is the change in internal energy and heat released in process $B C$ ?
A Carnot engine operates between $27^{\circ} C$ and $87^{\circ} C$. Find its efficiency.
View full solution →The coefficient of performance of a room air conditioner is $3 .$ If the rate of doing work is $2 kW$, find the heat current.
View full solution →In a refrigerator, in one cycle, the external work done on the working substance is $20 \%$ of the energy extracted from the cold reservoir. Find the coefficient of performance of the refrigerator.
View full solution →What is the internal energy of one mole of argon and oxygen?
Define internal energy.
The coefficient of performance of a Carnot refrigerator is $4.$ If the temperature of the hot reservoir is $47^{\circ} C$, find the temperature of the cold reservoir.
View full solution →A Carnot engine receives $6 \times 10^4 J$ from a reservoir at $600 K$, does some work, and rejects some heat to a reservoir at $500 K$. Find the
(i) the heat rejected by the engine
(ii) the work done by the engine
(iii) the efficiency of the engine.
View full solution →(i) the heat rejected by the engine
(ii) the work done by the engine
(iii) the efficiency of the engine.
What is a Carnot refrigerator? State the expressions for the coefficient of performance of a Carnot refrigerator.
Draw a neat labelled diagram of a Sterling cycle and describe the various processes taking place in a Sterling engine.
Draw a neat labelled diagram of a Carnot cycle and describe the processes occurring in a Carnot engine. Write the expression for the efficiency of a Carnot engine.
State and explain the limitations of the first law of thermodynamics.
How does an air conditioner differ from a refrigerator? Define the coefficient of performance of an air conditioner and express it in terms of heat current.
Explain the energy flow in a refrigerator and define the coefficient of performance of a refrigerator.
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