An ideal gas goes from the state i to the state fas shown in figure. The work done by the gas during the process: 
- AIs positive.
- BIs negative.
- ✓Is zero.
- DCannot be obtained from this information.
Answer: C.
View full solution →Question types
Laws of Thermodynamics question types
51 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
51
Questions
6
Question groups
5
Question types
01
M.C.Q (1 Marks)
14 Q→021 Marks Question
1 Q→032 Marks Questions
7 Q→043 Marks Question
11 Q→055 Marks Questions
14 Q→06Case study (4 Marks)
4 Q→Sample Questions
Laws of Thermodynamics questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
The internal energy of an ideal gas decreases by the same amount as the work done by the system:
- The process must be adiabatic.
- The process must be isothermal.
- The process must be isobaric.
- The temperature must decrease.
- AOnly $A$
- B$A$ and $B$
- ✓$A$ and $D$
- D$C$ and $D$
Answer: C.
View full solution →In a process on a system, the initial pressure and volume are equal to the final pressure and volume.
- AThe initial temperature must be equal to the final temperature.
- BThe initial internal energy must be equal to the final internal energy.
- ✓Both $A$ and $B$
- DThe net work done by the system in the process must be zero.
Answer: C.
View full solution →Figure. shows two processes A and B on a system. Let $\Delta\text{Q}_1$ and $\Delta\text{Q}_2$ be the heat given to the system in processes A and B respectively. Then,
- ✓$\Delta\text{Q}_1>\Delta\text{Q}_2$
- B$\Delta\text{Q}_1=\Delta\text{Q}_2$
- C$\Delta\text{Q}_1<\Delta\text{Q}_2$
- D$\Delta\text{Q}_1\le\Delta\text{Q}_2$
Answer: A.
View full solution →The first law of thermodynamics is a statement of:
- AConservation of heat.
- BConservation of work.
- CConservation of momentum.
- ✓Conservation of energy.
Answer: D.
View full solution →Should the internal energy of a system necessarily increase if its temperature is increased?
A force F is applied on a block of mass M. The block is displaced through a distance d in the direction of the force. What is the work done by the force on the block? Does the internal energy change because of this work?
The pressure of a gas changes linearly with volume from $\text{10kPa, 200cc}$ to $\text{50kPa, 50cc}$.
View full solution →- Calculate the work done by the gas.
- If no heat is supplied or extracted from the gas, what is the change in the internal energy of the gas?
Can work be done by a system without changing its volume?
Calculate the heat absorbed by a system in going through the cyclic process shown in figure.
A gas is enclosed in a cylindrical vessel fitted with a frictionless piston. The gas is slowly heated for some time. During the process, $10\ J$ of heat is supplied and the piston is found to move out $10\ cm$ . Find the increase in the internal energy of the gas. The area of cross section of the cylinder $=4 \mathrm{~cm}^2$ and the atmospheric pressure $=100 \mathrm{kPa}$.
View full solution →Figure. shows three paths through which a gas can be taken from the state A to the state B. Calculate the work done by the gas in each of the three paths.
When an object cools down, heat is withdrawn from it. Does the entropy of the object decrease in this process? If yes, is it a violation of the second law of thermodynamics stated in terms of increase in entropy?
Should the internal energy of a system necessarily increase if heat is added to it?
When a system is taken through the process abc shown in figure. 80J of heat is absorbed by the system and 30J of work is done by it. If the system does 10J of work during the process adc, how much heat flows into it during the process?
What should be the condition for the efficiency of a Carnot engine to be equal to 1?
The internal energy of a gas is given by $U=1.5 \mathrm{PV}$. It expands from $100 \mathrm{~cm}^3$ to $200 \mathrm{~cm}^3$ against a constant pressure of $1.0 \times 10^5 \mathrm{~Pa}$. Calculate the heat absorbed by the gas in the process.
View full solution →A gas is initially at a pressure of $100kPa$ and its volume is $2.0m^3$. Its pressure is kept constant and the volume is changed from $2.0m^3$ to $2.5m^3$. Its volume is now kept constant and the pressure is increased from $100kPa$ to $200kPa$. The gas is brought back to its initial state, the pressure varying linearly with its volume.
View full solution →- Whether the heat is supplied to or extracted from the gas in the complete cycle?
- How much heat was supplied or extracted?
A gas is taken through a cyclic process ABCA as shown in figure. If $2.4$ cal of heat is given in the process, what is the value of J?
View full solution →Figure. shows the variation in the internal energy U with the volume V of $2.0mol$ of an ideal gas in a cyclic process abcda. The temperatures of the gas at b and c are $500K$ and $300K$ respectively. Calculate the heat absorbed by the gas during the process.
View full solution →Calculate the increase in the internal energy of 10 g of water when it is heated from $0^{\circ} \mathrm{C}$ to $100^{\circ} \mathrm{C}$ and converted into steam at 100 kPa . The density of steam $=0.6 \mathrm{~kg} / \mathrm{m}^{-3}$. Specific heat capacity of water $=4200 \mathrm{~J} / \mathrm{kg}^{-10} \mathrm{C}^{-1}$ and the Jatent heat of vaporization of water $=2.25 \times 10^6 \mathrm{~J} / \mathrm{kg}^{-1}$.
View full solution →When we rub our hands they become warm. Have we supplied heat to the hands?
A closed bottle contains some liquid. The bottle is shaken vigorously for 5 minutes. It is found that the temperature of the liquid is increased. Is heat transferred to the liquid? Is work done on the liquid? Neglect expansion on heating.
An ideal gas is pumped into a rigid container having diathermic walls so that the temperature remains constant. In a certain time interval, the pressure in the container is doubled. Is the internal energy of the contents of the container also doubled in the interval?
When a tyre bursts, the air coming out is cooler than the surrounding air. Explain.
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